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William Optics GT153 f/7.8 OTA FPL53 triplet APO, 3.5" FT focuser with 3" Rotolock (A-F153GTBU-FT )

Estimated Delivery: 7-21 Days (On Back Order - Ask Us for Details)
WO-GT153 f/7.8 OTA
(Pre Order) All new GT153 - Shipping ~ Mid-Octoboer Introducing the ALL NEW GT153 full-frame imaging APO!You will be blown away by the small details you can observe through this APO 153mm; fine det...

(Pre Order) All new GT153 - Shipping ~ Mid-Octoboer

Introducing the ALL NEW GT153 full-frame imaging APO!

You will be blown away by the small details you can observe through this APO 153mm; fine details of DSOs, stunning resolution both visually or during astrophotography.

Until yesterday this was only a dream at this price!

Stunning Optics

• Features a top-quality triplet air-spaced objective.

• This scope is extremely sharp and has a great color correction which is ideal for astrophotography.

• Precision optics with STM coatings.

• Designed by a leading designer with FPL-53 glass.

3.5” Feather Touch R&P focuser

• Large 3.5” Feather Touch Focuser: a treat to use during astrophotography. No image shifting!

• 360 deg. rotatable.

• Extra-heavy duty.

• Large aluminum knobs.

Ideal for Astrophotos

• Have you always dreamed of taking those beautiful pictures of the heavens? Now is the time!! Few other refractors in this size have two DEDICATED Field Flattener and a reducer/flattener available.

• Graduated scale for precise camera alignment.

Do-all Telescope

• The 153mm objective is a great size for both wide-field and planetary observations.

• The apochromatic performance makes it ideal for imaging.

• This size will require a suitable mount in order to do astro imaging.

Simply Beautiful Finish

• No plastic part used: CNC machined out of solid high-grade aluminum.

• Pure William Optics quality fit and finish: powder-painted white CNC-machined aluminum tube, retractable dewshield, anodized 360 degree rotatable FT focuser, engraved dew-shield Bahtinov cap (patented).

Attention to Details

• Highly precise CNC machined lens cell.

• Solid CNC-machined mounting rings with carry Handel /guiding rings included in the price.

• Triple testing each lens by Zygo test to ensure the best optical quality (we provide test report at additional $150).

Total Quality Package

• Mounting rings,guiding rings,large Losmandy type dovetail,CNC handle ,Bahtinov cap and 3”Rotolock adapter are included.


Retracted Length:1100mm

Total OTA weight including mounting rings just 13.5kg (29.5lb).

New Triplet APO X0.72 Full frame Field flattener reducer also Available

From F7.8 cut down to F5.6 only.


  • Bahtinov mask cover

  • Steel lens cell

  • Dovetail plate

  • Mounting rings

  • Guiding rings

Note: The guide scope pictured is not included - please order it as an option if required

A case is not included

Optional accessories

Large 3.5” rotator

Flat68lll x1 flattener

Flat8 x0.72 flattener

STC 48mm duo-narrow band filter 


Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

Items that have been opened, damaged or are otherwise unsaleable will be subject to a minimum 10% restocking fee, to be assessed by Telescopes Canada upon receipt of the returned goods

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the 'Complete Orders' link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.


We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

Typographical Errors and Order Cancellations

Telescopes Canada reserves the right to cancel an order due to an error in pricing by Telescopes Canada or one of our suppliers, equipment being no longer obtainable, or other events which are out of our control.

Client-Initiated Cancellations

Client-initiated order cancellations are accepted prior to delivery of the equipment to the customer, thereafter it is a return.