The three element apochromatic design and FPL-53 glass work together to provide superior optical performance and excellent aberration correction. Extremely sharp with excellent color correction. Also, I use a modest price reducer/flattener so I won't dwell on optical performance which is at least very good. Each element is fully multicoated with a special super-high transmission (STM) coating on all surfaces. Understanding William Optics Telescopes and Imaging Lenses 2. My camera, filter wheel and reducer weigh about 2 lb, and this scope can hold them all night without even tightening down the focus lock. Shipping will be via the cheapest shipping method which will vary depending on the items in your order. The new GT81 features a 3-element objective using high-quality FPL-53 extra-low dispersion glass that reduces any secondary spectrum to an unbelievable degree. The image can be focussed using the focus wheels on the side. Types of William Optics: GT71 Refractor Telescope 5. Back focus specifications: Telescope only: Available maximum backfocus is 183.4mm from the base of the M63 male thread. The Sun is more active than its been in years and if thats not enough, we have the Annular Solar Eclipse on October 14, 2023 and the Total Solar Eclipse on April 8, 2024! Introducing the first telescope in the William Optics Internal Focus Design (WIFD) Apochromatic Series: The WIFD Gran Turismo 81mm APO Refractor. All Rights Reserved. Telescope can focus as long as your image sensor is placed anywhere between the . All in all, an excellent scope for AP if one recognizes the associated limitations. The William Optics GT-81 APO Triplet refractor features a 3-element f/5.9 objective with an Ohara FPL-53 extra-low-dispersion glass element for optimum colour correction and a new upgraded dual-speed 2-inch Rack & Pinion focuser with 1:10 Dual Speed. Pure William Optics quality fit and finish: powder-painted white CNC-machined aluminum tube, gold trim finish, retractable dewshield, dewshield cap. Special Offer: Receive $10 off a Soft Carry Case for this telescope. For the best experience on our site, be sure to turn on Javascript in your browser. This is a superb piece of triplet, with medium reach. The GT81 also includes a retractable dewshield, dewshield cap, and soft carry case. Press Here to Download a free Adobe Acrobat Reader. William Optics All New 0.8x Reducer / Adjustable Field Flattener 6AIII for GT71, GT81, Z81 & William Optics 2" to 1.25" RotoLock Eyepiece Adapter - Gold # F-ROTO-A2-125GDII, William Optics 2" to 1.25" RotoLock Eyepiece Adapter - Red # F-ROTO-A2-125RDII, William Optics All New 50mm UniGuide Scope with Slide-base - Gold # M-G50PB-WG, William Optics All New 50mm UniGuide Scope with Slide-base - Red # M-G50PB-WR, William Optics All New 50mm UniGuide Scope with Slide-base - Space Gray # M-G50PB-TG, William Optics Camera Angle Adjuster / Rotator with M63 Threads # M-CAA63, Premium 81mm apochromatic refractor for astronomical imaging and visual observation, Apochromatic f/5.9 triplet objective with FPL-53 glass, Large image circle for imaging with APS-C and full-frame sensors when used with a flattener, Compact form factor and light weight ideal for transport and travel, Image Circle: >Full Frame (with recommended flatteners; image circle size without a flattener will be smaller but has not been specified by William Optics), Interchangeable T-Mount (sold separately): Canon EF, Nikon F, Sony E, Pentax, Micro Four Thirds, Fuji FX, Scratches - Maximum Length: 1/4 of total lens diameter, Dots or Spot Points - Maximum Diameter: 0.4 mm, Dots or Spot Points - Maximum Quantity: Three, Accumulation of Defects - Limited Area: 0.8mm^2, Accumulation of Defects - Total Area: 5.8mm^2. > Lens cleaners Total price for the pair from FLO is 864 plus postage which is as good a price as you will find. diamond-coated drive system: very smooth, no lateral movement or tilting. Stainless steel reinforcement inserts on both sides and on the back to allow heavy loading without problems. F/5.9 f-ratio, so a good choice for astrophotography. Sign up for our newsletter to get exclusive deals, observing tips, and new product announcements. William Optics Gran Turismo 81 APO Triplet Refractor Telescope - Gold I wish the scope came with a finder bracket on the body, if you are using a guide scope and plan mounting a PC or ASIair, you need to purchase a finder bracket separately which is a pain, made worse if you forget to order at the same time and have to wait longer to be up and running!! Graduated scale for precise camera alignment on focuser tube. I have only used the scope for a short time so far, so my experience with it is limited. Stainless steel reinforcement inserts on both sides and on the back to allow heavy loading without problems. All Instruction Manuals for William Optics products are available for online viewing or download as PDF files. All rights reserved. Baader AstroSolar Filter for Telescopes - 80mm Filter Aperture # ASTF-80, William Optics Soft Carry Case for Z81 / GT81 / GTF81 Telescopes, Three element with FPL-53 Air Spaced, Fully Multi-Coated, STM coatings. For the best experience on our site, be sure to turn on Javascript in your browser. Posted 18 April 2021 - 06:14 PM I'm planning to purchase my first APO triplet refractor, mainly for astrophotography, and am looking at either a Williams Optics GT71 (f/5.9, 420mm FL) or GT81 (f/5.9, 478mm FL). One limitation the scope has is in focusing. And to make it easier for you to get the most extensive news, articles and reviews that are only available in the magazine pages of Astronomy Technology Today, we are offering a 1-year magazine subscription for only $6! Latest Gen IV version introduced in June 2020. JavaScript seems to be disabled in your browser. . Search Results - High Point Scientific Comes with two locking screws on angled positions for heavy load applications. Optical system: Air-spaced triplets with 1 FPL-53 fluorite element: Aperture: 81 mm: Focal . The GT81 has FPL-53 glass and the optics are spectacular. . Description Specifications Included Items Recommended Products Reviews The William Optics Gran Turismo 81 Triplet is designed to deliver incredible image quality in a compact package. Two-year, no fuss warranty and constant customer service! > Prisms & Diagonal mirrors Apochromatic refractor AP 81/478 Gran Turismo GT 81 Gold OTA - Astroshop Contiguous US Customers:All items we sell ship for free within the Contiguous US. The Williams Optics WIFD GT81 APOs new internal focuser offers precise internal sliding of fixed optics to prevent image shift. Copyright 2003-2022 Agena AstroProducts. No image shifting! From the gleaming white powder coat on the heavy-duty aluminum tube to the elegant color trim, this telescope is beautiful enough to turn heads and precisely engineered to give razor-sharp images. 2023 OPT Telescopes. Your wishlist has been temporarily saved. Luckily, I got the red one, which nicely matches with ZWO environment and GEM28. The company notes it has future plans to offer a new electric rotator. The focusers redistribution of weight allows for better balance during imaging sessions. The stunning new William Optics Gran Turismo 81 Apo is the new jewel of the apochromatic refractor world. - Optional Flattener: WO FLAT6AIII 0.8x FLAT68III 1.0X (Requires WIFD Extension Adapter) A few large telescopes and mounts are excluded from this free shipping offer. The William Optics Gran Turismo 81mm triplet refractor is CNC machined out of high quality material and anodized with an immaculate white finish and red trim. Omegon Star diagonal with 99% reflection, 2", Omegon Carry case transport bag for accessories, Omegon LE Series Eyepiece, 12.5mm, 1.25'', Omegon Ultra Wide Angle eyepiece 9mm 1,25", Omegon Ultra Wide Angle eyepiece 15mm 1,25", Omegon Ultra Wide Angle eyepiece 20mm 1,25", Omegon Reticle eyepieces Illuminated crosshair eyepiece, 12.5mm, Omegon eyepiece and accessories case, large, Omegon Filters Variable grey filter 1.25", Omegon Filters 2'' Moon filter 25% Transmission, Omegon Filters Variable Polarising Filter 2", Omegon Filters Nebula/ city light filter 1.25 '', Omegon Filters Light Pollution Filter, 2, Omegon Filters Color filter set 1,25'' (6 pieces), Omegon Easypic Universal Smartphone Adapter, Baader Adaptors Plug-in connection 2 " A/T-2a for putting into all 2 " Okularauszge, Cambridge University Press Cosmic Challenge, Baader Sun filter foil AstroSolar ECO-size OD 5.0 140x155mm, Baader Lens Cleaning Pump Spray Optical Wonder 100ml, Omegon microfibre cleaning cloth 20cm x 20cm. Check out our 2022 telescope buying guide here! A distinction is made between refractor (lens) and reflector (mirror) telescopes. William Optics Apochromatic refractor AP 81/478 GT81 - Astroshop The aperture indicates the diameter of the objective lens or the mirror. A focuser is used to hold an eyepiece. Retractable dew-shield with patented Bahtinov focus mask. THE WILLIAM OPTICS GRAN TURISMO 81-MM REFRACTORS most true Apos have a three lenses in the opticaltrain,theGranTurismolineoftel-escopeshavefiveopticalelements.Theob-jective is an 81-mm (3.2-inches) diameter optical air-spaced triplet containing high-quality FPL-53 extra-low dispersionglass. New ultra smooth 2" Crayford V-power edition focuser with 1:10 dual speed: a treat to use during astrophotography. The Williams Optics WIFD GT81 APO specifications include: Lens Type: Triplet Apochromatic Prime Lens, Optional Flattener: WO FLAT6AIII 0.8x FLAT68III 1.0X (Requires WIFD Extension Adapter), Camera Format: Full Frame DSLR Mirrorless CMOS CCD, T-Mounts Supported; Canon EF, RF; Nikon F, Z; Sony E; Pentax K; Micro Four Thirds (M4/3); FUJI X. William Optics Gran Turismo GT81 II Please let us know. The focuser dratube terminates in a 2" holder and also comes with a 1.25-2 adapter with non-marring compression rings. Do you have specific questions about your order or products? Additional optical designs are possible to meet various photographic requirements enhancing the line to include a number of apertures and fast focal ratios. The William Optics Adjustable Field Flattener improves the flat-field imaging performance of William Optics GT71, GT81, Z81, and Z103 refractors. 2" & 1.25" adapter included in the price. William Optics All New Gran Turismo 81 IV APO Refractor with 2.5" R&P The William Optics WIFD GT81 81mm f/5.9 Apo Refractor OTA features a revolutionary new internal focuser that prevents sensor tilt. Accessories 9. William Optics Gran Turismo GT81 II. . If youd like to learn more about the technology behind solar observing, solar imaging and more, you can check out our free publication,The Definitive Guide to Viewing and Imaging the Sun. Additional optical designs are possible to meet various photographic requirements enhancing the line to include a number of apertures and fast focal ratios.. Optical system: Air-spaced triplets with 1 FPL-53 fluorite element: Aperture: 81 mm: Focal length: . The lens elements are perfectly aligned to the optical path and secured with special optical silicone that compensates for the expansion and contraction rates that occur under very cold conditions between the glass and the metal tube. The weight of the tube is critical for the correct choice of mount. Large aluminum knob with installed thermometer. The stunning new William Optics Gran Turismo 81 Apo is the new jewel of the apochromatic refractor world. The dimensions of scratches and points shall not exceed the following values: * Not a Retail Store * 16313 Arthur StreetCerritos, CA 90703, USA. The only sad point is that my 132FLT rarely gets used now! From the pristine white finish on the CNC tube to the elegant gold trim, this telescope has more than just good looks. This makes it a snap to achieve sharp focus when setting up for astrophotography. Comes with two locking screws on angled positions for heavy load applications. I was excited about the iOptron CEM40 center-balanced equatorial telescope mount when it came out because it hits the sweet spot in the intermediate . It was a solid mass of finely crafted aluminum and glass. William Optics Gran Turismo 81 APO Triplet Refractor Telescope - Gold. Cheers. Is the ratio of the aperture to the focal length of a telescope. Found a better shipped price? The integrated position viewing window on the focuser provides instant verification of the graduated numerical display. Types of William Optics: RedCat 71 6. The tube weighs just 3.9kg (8.6lbs) including tube rings and dovetail plate. You can learn more about the Williams Optics WIFD GT81 APO here. All rights reserved. Innovative Bahtinov Mask Cover (Patented) & New Dovetail Plate included! The internal movement of the optical elements is protected from the elements and can't come out of alignment. Fully multi-coated to provide bright and flat field across 97% of full-frame sensors. Specifications. Free Shipping William Optics Gran Turismo 81 APO w/ Internal Focus Design, Field Flattener & UniGuide WO-T-GT-81RD-WIFD-AP $2,241.00 Free Shipping William Optics Gran Turismo 81 w/ Internal Focus Design APO WO-T-GT-81RD-WIFD $1,998.00 Free Shipping William Optics Gran Turismo 71 APO Refractor - Red WO-A-F71GTII-RD $933.00 Free Shipping (3), + Show more accessories in this category: 2, Europe's largest astronomy equipment retailer, Triplet air-spaced objective (FPL-53) in adjustable CNC machined ultra high precision lens cell, Extremely sharp with excellent color correction, Each lens is Fully Multi-Coated with a special super-high transmission coating (STM Coating) on all surfaces. The Williams Optics WIFD GT81 APO incorporates the WO CAT design ring tubes and dovetail base which are now lighter than before while remaining equally rigid. Pure William Optics quality fit and finish powder-painted white CNC-machined aluminum tube, gold trim finish, retractable dew shield, dew shield cap. * Not a Retail Store * 16313 Arthur StreetCerritos, CA 90703, USA, Availability: Item has been discontinued by the manufacturer. Graduated scale for precise camera alignment on focuser tube. Title: 1 Author: emma Created Date: 8/30/2018 10:48:05 AM . Telescope with P-FLAT6AIII flattener (included): 55mm with flattener adjustment scale set to 7.1mm, Telescope with P-FLAT68III flattener (sold separately and requires use of an additional adapter): 55mm with flattener adjustment scale set to 10.9mm, Image circle size (OTA only, OTA with FLAT6AIII, OTA with FLAT68III): All 44.4mm (full frame coverage), Total weight (with rings & dovetail plate): 9.9 lbs (4.5 kgs), Tube length (dew shield fully retracted): 420mm, Tube length (dew shield fully expanded): 500mm, Camera Format: Full Frame | DSLR | Mirrorless | CMOS | CCD, M48 T-Mounts Supported: Canon EF, RF | Nikon F, Z | Sony E | Pentax K | Micro Four Thirds (M4/3) | FUJI X, William Optics WIFD GT81 81mm f/5.9 Apo Refractor OTA - Red. It is built like a tank. Skip to the beginning of the images gallery. Specifications. From the pristine white finish on the CNC tube to the elegant go . (6), + Show more accessories in this category: 5, + Show more accessories in this category: 4, + Show more accessories in this category: 6, Filters Comes with two locking screws on angled positions for heavy load applications. Heavy-Duty Focuser with Integrated Camera Rotator, Tube Rings, Soft Case and Accessories. Gran Turismo 81(Innovative Bahtinov Mask Cover (Patented) included!!) Steve Ringwood writing for Astronomy Now Magazine "The 81 mm, f/5.9 telescope from the stable of William Optics has been a long favourite with visual and imaging astronomers thanks to its triplet apochromatic prime lens, its FPL-53 glass and a Strehl ratio of better than 0.95, all ensuring great performance. First Light Optics LtdUnit 7 Budlake UnitsBudlake RoadMarsh Barton Trading EstateExeter, DevonEX2 8PY, Company No. Designed by WPZOOM, Southern Hemisphere Astrophotography Competition, Orion Observer Refractor Sun and Moon Kit. For the best experience on our site, be sure to turn on Javascript in your browser. The stock focusers on many telescopes are simply not capable of supporting the weight of today's heavy image trains that can include a rotator, off-axis guider, filter wheel, camera, and more. William Optics Gran Turismo 81 APO Refractor with Internal Focus Design - Space Gray SKU: WYO-T-GT-81SG-WIFD Optical Design: Refractor Telescope Aperture: 81mm (3.19") Focal Ratio: f/5.9 Telescope Mount Type: No Mount - OTA Only Type of Electronics: OTA Only - No Electronics Free shipping $1,998.00 Pre-Order Add to cart As low as $64.54/Month The telescopes magnification should not exceed this factor, because otherwise the image will appear weak and dark. William Optics GT81 APO is a f/5.9 air-spaced triplet FPL-53 apochromat. Older Telescopes PDFs List < Click Here Telescopes 50-75mm. During check-out, you will be presented with several shipping choices and costs. That was another reason for my choosing this scope. During check-out, you will be presented with several shipping choices and costs. The company notes it has future plans to offer a new electric rotator. However, the export of some items may be restricted outside the US due to size or manufacturer restrictions. Included is the WO Saddle Bar Handle, which facilitates rigid guidescope mounting and autoguiding performance. It's like a work of art. William Optics FLAT6AIII Adjustable Field Flattener Gran Turismo 81 - William Optics Ok, this is not a Takahashi, however it is perfectly good for most applications and good value at this price point. Each lens is Fully Multi-Coated with a special super-high transmission coating (STM Coating) on all surfaces. . I purchased the GT81 for deep sky AP only so that may influence my opinions. For these items, please contact us to obtain a shipping quote before you check out using the online shopping cart.International Customers:Free shipping does not apply to international orders. With a focal length of 478mm, this f/5.9 telescope has a retracted length of just 390mm (15.4), compact enough to qualify as carry-on luggage with most airlines. Triplet air-spaced objective (FPL-53) in adjustable CNC machined ultra high precision lens cell. As for the focuser itself, it is not as smooth as one might expect. The William Optics 0.8x focal reducer is also available to reduce the focal ratio to a fast f4.72. Copyright 1996-2023 William Optics. Lens Type: Triplet Apochromatic Prime Lens. Triplet air-spaced optics with FPL-53 ED element in adjustable CNC machined lens cell. William Optics GT81 81mm f/5.9 Triplet APO | Cyclops Optics Specifications. This F/5.9 lens is ideal for astrophotography. The second group, located at the focuser Scratches : Width no more than: 0.025 mm: Total length no more than The fast f/5.9 triplet air-spaced objective of this premium refractor includes FPL-53 glass for superb color correction. Gran Turismo 81 Twenty Years Anniversary Edition - William Optics During checkout, you may also be shown other optional faster shipping choices.US Customers in Hawaii and Alaska: Free shipping applies to almost all products. 2.5 R&P Ultra robustfocuser with 1:10 dual speed: a treat to use during astrophotography. Simply Beautiful Finish The 32mm f/3.75 UniGuide Guide Scope is a an excellent choice for autoguiding and will easily attach to the GT81's built in guide scope rail. The cost of the GT81 is about $600 (or 65%) higher than the GT71. From the pristine white finish on the CNC tube to the elegant gold trim, this telescope has more than just good looks. Best Prices on William Optics Equipment | OPT Telescopes Optics. rotatable 2"R&P focuser with 1:10 dual speed: a treat to use during astrophotography. Premium Build Quality and Compact Form Factor. The stunning new William Optics Gran Turismo 81 Apo is the new jewel of the apochromatic refractor world. A dovetail in the handle accommodates William Optics' Uniguide guidescopes or an additional set of rings for a conventional guide scope (guide scope rings and guide scope sold separately). SKU: WO-A-F81GTII Condition: New . A convenient CNC-machined carrying handle mounts on top of the dual mounting rings. The William Optics GT81 features a patented objective lens cover that doubles as clear Bahtinov focusing mask. The telescopes field rotator design features smooth camera rotation with markings for degrees and a locking thumbscrew to prevent accidental camera movement. - Focal Length: 478mm. The stunning new William Optics Gran Turismo 81 Apo is the new jewel of the apochromatic refractor world. Accepting orders now! The new GT81 features a 3-element objective using high-quality FPL-53 extra-low dispersion glass . * Not a Retail Store * 16313 Arthur StreetCerritos, CA 90703, USA, Astrophotographers can now enjoy the benefits of a traditional two speed fine focuser without worrying about how heavy their image train is and yes, it's compatible with the. The WIFD Gran Turismo 81mm refractor also features a new temperature compensated lens cell design. William Optics GT81 81mm f/5.9 Blue Apo Refractor - Limited Edition The user can enjoy the benefits of a traditional two speed fine focuser, while not worrying about limitations typically found in traditional rear mounted focusers.. For the best experience on our site, be sure to turn on Javascript in your browser. Home> Telescopes> Telescopes - In Stock, (Details shown apply to the default selection), William Optics GT-81 IV - Checked & Tuned Gold, Model: wo_gt81_iii_gdPart Number: A-F81GTIVGD. William Optics Gran Turismo GT81 IV Triplet ED Refractor OTA William Optics GT81. William Optics GT-81 IV - Checked & Tuned | First Light Optics For the best experience on our site, be sure to turn on Javascript in your browser. William Optics GT81 APO. ZS81 has a longer focal length and therefore a bit more magnification - check this out in Stellarium using the camera view. Extra-smooth 360 deg. The naked eye, for example, can make out stars with a magnitude of up to 6. Click here to get these deals which only will be available for a very limited time. As usual, all the advice given by Alex prior to purchase regarding backfocus, attaching the camera and so on. A few large telescopes and mounts are excluded from this free shipping offer. Differences: ZS81 is a doublet and costs less; GT81 is a triplet and costs more - triplet is supposed to be better across the frame than a doublet, since this is my only telescope I can't compare. - Diameter: 81mm. Skywatcher esprit 80ED or William optics GT81 IV The Williams Optics WIFD GT81 APO is the first offering from William Optics featuring a new Internal Focus Design (WIFD) Apochromatic Series of telescopes. This can cause the focuser to slip out of focus, or even worse: cause dreaded sensor tilt, which can be daunting to fix. It must be in stock at the time of Price Match for us to make a guarantee. The WIFD focuser drawtube stays housed in the main chassis of the telescope, which results in a dramatically more stable focuser: The WIFD features a smooth rack and pinion design that is incorporated into the focuser to provide precise adjustability for critical focus. An excellent telescope for astrophotography! There are basically two different construction types: the rack and pinion focuser and the Crayford focuser. IL-LIAM OPTICS USA WILLIAM OPTICS . JavaScript seems to be disabled in your browser. The GT81 is absolutely fantastic for astrophotography and has the great quality associated with WO gear. All William Optics refractor objectives are double tested and inspected by WO at their factory. $ 108.00* Omegon transport bag for 5'' OTAs. (4), + Show more accessories in this category: 3, Telescope accessories InternetSales@optcorp.com, 800-483-6287 No rainchecks will be issued for items out of stock at OPTcorp.com to match a competitor's price. Chromed, soft thumbscrews, easy to use even with gloves on. (4), + Show more accessories in this category: 7, + Show more accessories in this category: 1, Maintenance & Cleaning Specs; Product Info. Contiguous US Customers:All items we sell ship for free within the Contiguous US. Summary 1. - F/ Ratio: f/5.9. But for AP, I don't need the extender and deflection doesn't seem to be a problem so far. Shipping will be via the cheapest shipping method which will vary depending on the items in your order. For the best experience on our site, be sure to turn on Javascript in your browser. Extra-smooth 360 deg. Diagonal Optical Path Lengths (Coming Soon), Relative Eyepiece Focus Point (Coming Soon), Replacement Eyepiece End Caps (Coming Soon), Measured Apparent Field of View (Planned). The scope is extremely solid and well built. The included field rotator features smooth camera rotation with markings for degrees and a locking thumbscrew to prevent accidental camera movement. Types of William Optics: RedCat 51 Refractor Telescope 3. Still not sure what is the right gear for you? Optional William Optics 0.8x focal reducer is available to reduce the focal ratio to a fast f4.72. The stunning new William Optics Gran Turismo 81 Apo is the new jewel of the apochromatic refractor world.. From the pristine white finish on the CNC tube to the elegant gold trim, this telescope has more than just good looks. Triplet air-spaced objective (FPL-53) in adjustable CNC machined ultra high precision lens cell. The new GT81 features a 3-element objective using high-quality FPL-53 extra-low dispersion glass that reduces any secondary spectrum to an unbelievable degree. This makes it a snap to achieve sharp focus when setting up for astrophotography. > Transport & storage The store will not work correctly in the case when cookies are disabled. William Optics Refractor Telescopes Buying Guide - Agena Astro
Traumatic Mydriasis Recovery Time, Do Crocodiles Eat Humans, Which Loans Are Exempt From The Atr Rule, Articles W