The innovative team at William Optics has been hard at work trying to resolve this problem, and have now announced their patented solution: the William Optics Internal Focus Design, or WIFD for short.The WIFD is a revolutionary telescope design that moves the focuser from the rear exterior of the telescope to the inside. Contiguous US Customers:All items we sell ship for free within the Contiguous US. Telescope only: Available maximum backfocus is 183.4mm from the base of the M63 male thread. Innovative Bahtinov Mask Cover (Patented), New Dovetail Plate and Built-In Camera Angle Rotator included! The focuser dratube terminates in a 2" holder and also comes with a 1.25-2 adapter with non-marring compression rings. One limitation the scope has is in focusing. The stunning new William Optics Gran Turismo 81 Apo is the new jewel of the apochromatic refractor world. This package includes a 0.8x Flat6A-81 reducer cum flattener specially designed for GT81 to transform it into a f/4.7 imaging APO covering full frame sensor. Extremely sharp with excellent color correction. - Focal Length: 478mm. Click here to get these deals which only will be available for a very limited time. Luckily, I got the red one, which nicely matches with ZWO environment and GEM28. The internal movement of the optical elements is protected from the elements and cant come out of alignment. Pure William Optics quality fit and finish powder-painted white CNC-machined aluminum tube, gold trim finish, retractable dew shield, dew shield cap. The image can be focussed using the focus wheels on the side. The William Optics GT81 features a patented objective lens cover that doubles as clear Bahtinov focusing mask. Latest Gen IV version introduced in June 2020. The GT81 also features a heavy duty 10:1 dual-speed 2.5" rack and pinion focuser with tension screws to securely hold a bigger camera and accessories . An excellent telescope for astrophotography! William Optics GT81. 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. Request stock alerts and we'll let you know when the item is back in stock. We will match any online price that we confirm as valid. The rings are anodized to match the color of the handle, dovetail, and focuser, giving the scope an attractive, premium appearance. 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. 2023 OPT Telescopes. The GT81 also includes a retractable dewshield, dewshield cap, and soft carry case. All rights reserved. > Lens cleaners The focuser also includes two additional screws to mount a red-dot finder (sold separately). 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. The movement of the focuser is integrated inside the main tube assembly, so there are no movements of a focuser drawtube visible from the outside. Each lens is Fully Multi-Coated with a special super-high transmission coating (STM Coating) on all surfaces. > Transport & storage *All prices include VAT plus shipping costs. The scope includes high-quality mounting rings to safely and securely hold the telescope to the mount. - Diameter: 81mm. All rights reserved. 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. Retractable dew-shield with patented Bahtinov focus mask. The William Optics 0.8x focal reducer is also available to reduce the focal ratio to a fast f4.72. diamond-coated drive system: very smooth, no lateral movement or tilting. Copyright 1996-2023 William Optics. The WIFD will not just be limited to the GT81, and will be adapted to many sizes of refractors. During check-out, you will be presented with several shipping choices and costs. The included field rotator features smooth camera rotation with markings for degrees and a locking thumbscrew to prevent accidental camera movement. As for the focuser itself, it is not as smooth as one might expect. 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. Included is the WO Saddle Bar Handle, which facilitates rigid guidescope mounting and autoguiding performance. Each lens is Fully Multi-Coated with a special super-high transmission coating (STM Coating) on all surfaces. All Instruction Manuals for William Optics products are available for online viewing or download as PDF files. 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. A telescope tube is referred to as an optic because it contains the components necessary to collect and concentrate light. The ability of the optic to discern the fine detail of objects that are close together. Heavy duty: perfect for your accessories. When paired with a William Optics field flattener (sold separately), the scope delivers a flat field across the entire 43.3mm diagonal of a full-frame sensor for excellent astrophotographic images. Each element is fully multicoated with a special super-high transmission (STM) coating on all surfaces. Specifications. 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. I purchased the GT81 for deep sky AP only so that may influence my opinions. Comes with two locking screws on angled positions for heavy load applications. I was concerned that such a sturdy scope would be somewhat compromised by having to rely on the focuser so far out and using extenders. A convenient CNC-machined carrying handle mounts on top of the dual mounting rings. The naked eye, for example, can make out stars with a magnitude of up to 6. 5892293VAT No. (4), + Show more accessories in this category: 3, Telescope accessories Cyclops Optics Ltd. is an authorised dealer of William Optics' products. Contiguous US Customers:All items we sell ship for free within the Contiguous US. - Optional Flattener: WO FLAT6AIII 0.8x FLAT68III 1.0X (Requires WIFD Extension Adapter) Innovative Bahtinov Mask Cover (Patented) & New Dovetail Plate included! Scratches : Width no more than: 0.025 mm: Total length no more than Type: Refractor; Diameter: 81 mm; Focal Length: 478 mm; Focal Ratio: f/5.9; Field Flattener: 6AIII 0.8x; Weight: 8.4 lbs (3.84 kg) The Telescope Mount. The Williams Optics WIFD GT81 APOs new internal focuser offers precise internal sliding of fixed optics to prevent image shift. The telescopes magnification should not exceed this factor, because otherwise the image will appear weak and dark. The William Optics WIFD GT81 81mm f/5.9 Apo Refractor OTA features a revolutionary new internal focuser that prevents sensor tilt. Availability info: All units from our first shipment of this package have been sold. Total price for the pair from FLO is 864 plus postage which is as good a price as you will find. 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! As usual, all the advice given by Alex prior to purchase regarding backfocus, attaching the camera and so on. Extremely sharp with excellent color correction. Specifications. We may get a couple of units from them in the first week of March, but otherwise the next production batch from William Optics is expected in mid-April. Copyright 1996-2023 William Optics. All William Optics refractor objectives are double tested and inspected by WO at their factory. 2.5 R&P Ultra robustfocuser with 1:10 dual speed: a treat to use during astrophotography. This makes it a snap to achieve sharp focus when setting up for astrophotography. William Optics GT81 APO is a f/5.9 air-spaced triplet FPL-53 apochromat. Check out our 2022 telescope buying guide here! (6), + Show more accessories in this category: 5, + Show more accessories in this category: 4, + Show more accessories in this category: 6, Filters This f/5.9 lens is ideal for astrophotography. Sign up for our newsletter to get exclusive deals, observing tips, and new product announcements. 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. Optional William Optics 0.8x focal reducer is available to reduce the focal ratio to a fast f4.72. Found a better shipped price? L-bracket Vixen/Synta-style dovetail base. It is built like a tank. No image shifting (capacity 15lb.)! All rights reserved. Skip to the beginning of the images gallery, Gran Turismo 81 Twenty Years Anniversary Edition (discontinued). All rights reserved. The price for an item/offer must be listed and valid at the time of match. The second group, located at the focuser F/5.9 f-ratio, so a good choice for astrophotography. Introducing the first telescope in the William Optics Internal Focus Design (WIFD) Apochromatic Series: The WIFD Gran Turismo 81mm APO Refractor. From the pristine white finish on the CNC tube to the elegant gold trim, this telescope has more than just good looks. Details: The item must be the identical item, brand name, size, weight, color, quantity and model number. This is a superb piece of triplet, with medium reach. Back focus specifications: Telescope only: Available maximum backfocus is 183.4mm from the base of the M63 male thread. The mechanics are good, the fit and finish is excellent, the inclusion of a manual rotator is nice and with the correct flattener the star shapes are pretty nice for the most part. Comes with two locking screws on angled positions for heavy load applications. William Optics GT81 APO. Five stars for both the telescope and the service! Optically Unbeatable 1. Once this beast is released into the wild, the rest of the blanks can be filled in. rotatable 2"R&P focuser with 1:10 dual speed: a treat to use during astrophotography. 5.0 William Optics GT81 Pros: Strong Construction,Easy to Use,Compact,Accurate,Quality Lenses. Types of William Optics: RedCat 71 6. Optical system: Air-spaced triplets with 1 FPL-53 fluorite element: Aperture: 81 mm: Focal length: . IL-LIAM OPTICS USA WILLIAM OPTICS . Astrophotographer and Agena Affiliate Bray Falls recently created this William Optics WIFD GT81 review video: This special astrophotography package includes the following extra items: If you are an astrophotographer, you've likely looked into upgrading your telescope's focuser at some point. (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 cost of the GT81 is about $600 (or 65%) higher than the GT71. Great scope for most of the nebulas and few of the galaxies. For the best experience on our site, be sure to turn on Javascript in your browser. This is the distance between the objective lens or mirror and the focal point. 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. We reserve the right to verify a competitor's advertised price and the availability of the item. 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. No image shifting! You dont have to sign up or provide any information, simply clickhereand enjoy reading! Graduated scale for precise camera alignment. 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. Diagonal Optical Path Lengths (Coming Soon), Relative Eyepiece Focus Point (Coming Soon), Replacement Eyepiece End Caps (Coming Soon), Measured Apparent Field of View (Planned). Oceanside Photo & Telescope wants our customers to shop with confidence knowing that you will always get the best deal available. Comes with two locking screws on angled positions for heavy load applications. The fast f/5.9 triplet air-spaced objective of this premium refractor includes FPL-53 glass for superb color correction. Accepting orders now! Your wishlist has been temporarily saved. Telescope accessories New 2020 William Optics GT81 IV! For the best experience on our site, be sure to turn on Javascript in your browser. 2" & 1.25" adapter included in the price. This can cause the focuser to slip out of focus, or even worse: cause dreaded sensor tilt, which can be daunting to fix. The Best Dedicated Astronomy Cameras for Beginners, Astronomik OIII 12nm CCD Filter - T-Threads, Pegasus Astro Dual Motor Focus Controller, 10 Micron 12kg (26.45lbs) Stainless Steel Counterweight- GM 2000, I would like more information regarding stock availability dates. Though you will never need it, you have a 2-year warranty from WO, and the certainty that we will be there to assist you even beyond that, if you need! Image credit: William Optics. Fully Multi-Coated optics for high contrast and maximum light transmission. 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. Additional optical designs are possible to meet various photographic requirements enhancing the line to include a number of apertures and fast focal ratios. Sign up for OPT news, exclusive offers, and updates on the latest gear! . A few large telescopes and mounts are excluded from this free shipping offer. That was another reason for my choosing this scope. The store will not work correctly in the case when cookies are disabled. Sign up for our newsletter to get exclusive deals, observing tips, and new product announcements. This redistribution of weight allows for better balance during imaging sessions. WO has a habit of slightly changing the focal length and aperture specs to make their scopes seem different but they aren't actually. Please contact our customer service! Still not sure what is the right gear for you? A distinction is made between refractor (lens) and reflector (mirror) telescopes. Optical system: Air-spaced triplets with 1 FPL-53 fluorite element: Aperture: 81 mm: Focal . For the best experience on our site, be sure to turn on Javascript in your browser. The stunning new William Optics Gran Turismo 81 Apo is the new jewel of the apochromatic refractor world. The GT81 also features a heavy duty 10:1 dual-speed 2.5 rack and pinion focuser with tension screws to securely hold a bigger camera and accessories without slipping or image shift, even during longer exposures. 5 stars for the scope and FLO. It will reduce the GT81 from a 478mm focal length f/5.9 to a 382mm f/4.7 telescope for a 50% increase in light gathering ability. Older Telescopes PDFs List < Click Here Telescopes 50-75mm. Or, for an even better deal, we are offering 2 years for only $9. Specs; Product Info. As the William Optics team notes, The Internal Focus Design (WIFD) Apochromatic Series offers an innovative and revolutionary design which combines a precision (Patented) internal focusing mechanism with the highest quality optics available, providing the ultimate Apochromatic refractor for astrophotography. 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. Premium Build Quality and Compact Form Factor. Stainless steel reinforcement inserts on both sides and on the back to allow heavy loading without problems. Includes tube rings, carry handle/guider mounting saddle & Bahtinov focus mask. Graduated scale for precise camera alignment, Quality fit and finish: powder-painted white CNC-machined aluminum tube, gold trim finish, retractable dewshield, dewshield cap. Designed from the ground up with the ability to handle the newest generation of large, heavy, high-resolution cooled cameras, the rock-solid optical tube assembly is uncompromised in quality. 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 the flattener, the stars are round corner to corner. Since all individual lens surfaces are machine coated, sometimes you may notice minor visual imperfections which will not compromise the optical performance of the telescope. The build quality was sick. Is the ratio of the aperture to the focal length of a telescope.
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