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View the Latest Diagonals & Prism Reviews

Item
Submitted By
GSO 1.25
GSO 1.25" 90-deg 99% Dielectric Mirror Diagonal with Compression Ring
5.0
excelent upgrade
Finish and quality are very good,, just waiting for a clear night in cloudy Florida to enjoy it
GSO 1.25
GSO 1.25" 45-deg Erect Image Amici Prism Diagonal # PD45
5.0
Nice
It gives the result what you expected.
Meade Series 5000 2
Meade Series 5000 2" Enhanced Dielectric Diagonal w/ SCT Adapter # 07680
2.0
Poorly constructed
I bought this in September 2018 to use with my Tel-Vue 2" eyepieces. The barrel eyepiece receiver on the diagonal came loose and would wobble making it less secure to hold any eyepiece in place. I bought this setup to make it easier to move the ...
GSO 0.965
GSO 0.965"/1.25" 90-deg Hybrid Mirror Star Diagonal
5.0
Performs very well in all
Performs very well in all my 60's refractors. Sturdy, too!
GSO 1.25
GSO 1.25" 90-deg 99% Dielectric Mirror Diagonal with Compression Ring
5.0
Well made , accepts filters
Well made , accepts filters on telescope end, holds heavier eyepieces securely.
Baader T-2 90° 32mm Prism Diagonal with 1.25
Baader T-2 90° 32mm Prism Diagonal with 1.25" Nosepiece and Eyepiece Holder # PRISM-1...
4.0
Focusing diagonal
One star off because three(!) screws to secure the brass band is overkill and the eyepieces tend to hang up when removing them. Optically excellent.
Baader T-2 90° 32mm Prism Diagonal with 1.25
Baader T-2 90° 32mm Prism Diagonal with 1.25" Nosepiece and Eyepiece Holder # PRISM-1...
5.0
Focusing diagonal
With plenty of diagonals available, I bought this so that a finer level of focus would be possible on scopes I have that utilize a helical focus mechanism. It works.
Baader 1.25
Baader 1.25" 45° Amici Prism Diagonal # AMICI-45 2956150
5.0
No compromise viewing
It requires more focuser travel than some scope have, but at focus the image is stunning. Will not come to focus on all scopes due to lengthy light path.
Tele Vue 1.25
Tele Vue 1.25" 90-deg Everbrite Star Diagonal # DPC-1250
5.0
Televue Everbrite Diagonal
Actually I returned the 1 1/4 inch Everbrite and bought the 2 inch Televue Everbrite - all through AgeanaAstro. Their refund was very quick and their shipping of both orders was amazing. I purchased a used Televue 76 and just decided I really wanted ...
GSO 1.25
GSO 1.25" 45-deg Erect Image Amici Prism Diagonal # PD45
4.0
It's a nicely made diagonal
It's a nicely made diagonal for a good price.
GSO 2
GSO 2" 90-deg 99% Dielectric Mirror Diagonal for Refractors
5.0
GSO 2" Dielectric Star Diagonal
Works as intended; no discernible reduction in image brightness; makes viewing objects near zenith much more comfortable; best price I could find on the web for a 2" dielectric diagonal. All of the GSO products I've bought to date are of hi...
Kokusai Kohki 3
Kokusai Kohki 3" Mirror Diagonal for Refractors & Large SCTs
5.0
This 3-inch diagonal is very
This 3-inch diagonal is very well made. I have not used the Cass adapter as i purchased it only for my refractor and there it does just as intended and very well. Nice product and would recommend.
Celestron 1.25
Celestron 1.25" Telescope Star Diagonal # 94115-A
5.0
This is a good buy
I haven't had this diagonal for very long but from what I can see from two nights of viewing the moon is that it shows a definite improvement in contrast. I'm using it with a 102 f6.5 refractor. The view looks better on the moon than the di...
William Optics 1.25
William Optics 1.25" 99% Dielectric Dura Bright Carbon Fiber Star Mirror Diagonal
5.0
Better than TV
I prefer these to the TeleVue diags. use them in 5 of my 6 scopes. OUTSTANDING value!!!
GSO 2
GSO 2" 90-deg 99% Dielectric Mirror Diagonal for Refractors
5.0
Same Quality, better price
I’ve had more expensive diagonals and the quality of this diagonal places it in the same league as the more costly ones.
GSO 2
GSO 2" 90-deg 99% Dielectric Mirror Diagonal for Refractors
5.0
Excellent!
Bought this because my GSO 2" refractor focuser, installed on my Orion StarBlast 90mm f/7.3 achro, didn't have enough in-travel to reach focus. The deep set adapter on this diagonal fixed that, and now everything is perfect. The diagonal it...
GSO 1.25
GSO 1.25" 90-deg Erect Image Amici Prism Diagonal # PD90
5.0
Back to the atlas- at last
I converted a straight thru spotting scope with a fixed eyepiece ( and short eye relief) to a telescope with the ability to change eyepieces- the objective lens went into a home built plywood box and this GSO diagonal allows me to use the Pocket Sky ...
Celestron 1.25
Celestron 1.25" Telescope Star Diagonal # 94115-A
5.0
clear, realiable, easily cleaned
was pleased with the brightness and easy cleaning, which is important, as I salvage and design many eyeoieces...
GSO 0.965
GSO 0.965"/1.25" 90-deg Hybrid Erect-Image Prism Diagonal
4.0
Good Value and Performance
Solid construction, optically good enough with no mechanical or optical flaws at a nice price. I'd like the eyepiece holder to have been removable ( with a T2 thread ) or lower profile but it's in use and makes my 60mm f 16.5 refractor quit...
Baader 2
Baader 2" 90° Erecting Amici Prism Clicklock Diagonal # AMICI-DX2 2456120
5.0
One of the best erecting prisms
German made. Extremely high quality but you have to pay for the best!