A review of the William Optics GT81 Apo refractor telescope.
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Author: Jenham's Astro
Graham as always im still searching for a nice grab and go package i can pack into a large camera backpack with a vixen porta mount and manfrotto tripod to take to dark skys. would the william optics flt98 pack a little more punch in your view for visual use? i know its expensive but i will use it for astro work in the long run. i looked at the c90 and sw 127 maks which are good but i am swaying towards better optics compactness with a bit mor fov. i decided on the 98 as a way of viewing jupiter and saturn at high mags but also to have the benefit of brighter deep sky objects too. any feed back from you and others will be much appreciated. thanks Rob 🙂
That is very nice.
do you use this for Visual? if so how does Jupiter look? small? I am interested in buying this for visual and AP but visual first and i want CA free views. let me know please!
Graham set up my megrez 90mm just viewed the moon and is very good. very sharp . is on par with my 8inch newtonian without doubt. very impressed!
Update. megrez 90 now rides on the vixen porta mini. handles the megrez
with ease 🙂 even with the 2inch wo star dia and 24mm 82 degree
explore. 2inch explore barlow on order and 6.7 mm 82 degree. last i tried with cheep 2x barlow and 8.8mm explore ep on moon and the results were amazing! the moon doesnt look flat but a globe. absolutly amazing! dark sky cottage booked in wales for sept cant wait! keep up the good work Graham 🙂
hi…thanks for the video…I have a wo gt81…it has ring but I am using it for guiding…my scope doesn’t comes with the finder mount attached to it…can you tell how you have attached your finder mount to the scope? thanks.
Hi Michael. The planets are small, but the quality of the optics means that you can use quite a lot of magnification and still have quite a crisp image. I would say that visually it’s strengths are a wide field and a bright image free of CA, but not necessarily planets. I use a Mak and webcam for planetary imaging as I have always found visual planetary observation a little underwhelming unless the seeing is very steady. For grab and go views of the moon and sun (filtered of course) and for large deep sky objects like M31/42/45 the WO is hard to beat. For me its size means i use it more than a heavier scope, but it’s true that this brings compromise in other areas. A longer focal length scope will give a better visual view of Saturn for example, but then you might need a better mount or guiding for AP. Tricky to have it all! Graham
A question, How would you rate its imaging capabilities? I had a bad experience with a WO Zs71 (lots of chromatic aberration) I got the flattener for this scope but wanna know if this scope has a good color correction. Thank you very much.