Dismiss Notice
New Cookie Policy
On May 24, 2018, we published revised versions of our Terms and Rules and Cookie Policy. Your use of AstronomyConnect.com’s services is subject to these revised terms.

View the Latest Diagonals & Prism Reviews

Item
Submitted By
GSO 1.25
GSO 1.25" 90-deg Mirror Star Diagonal for Refractors # GSST
5.0
Great With My ST80 Clone
I bought this to replace the correct image prism diagonal that came with my ST80 clone, which is a Meade Adventure Scope. The prism was ok for lower magnification terrestrial viewing, but not for astronomy. This GSO mirror diagonal is lightweight and...
William Optics 2
William Optics 2" 99% Dielectric Dura Bright Carbon Fiber Mirror Diagonal for Refractors
5.0
Perfect
Quality and finish for this accessory.I rediscover the deep sky.Use on CPC 1100
GSO 2
GSO 2" 90-deg 99% Dielectric Mirror Diagonal for Refractors
5.0
Another great eyepiece from Agena!
Highly recommend!!!! 5-stars
Celestron 1.25
Celestron 1.25" 45-deg Erect Image Diagonal # 94112-A
4.0
Works as described for the right application
This does exactly as described. I did find, however, that it was les than ideal for astronomical use. I wanted a right view for public night and it worked just fine. Perhaps out of long habit, I felt the conventional 90 degree was more comfortable. F...
GSO 1.25
GSO 1.25" 90-deg 99% Dielectric Mirror Diagonal with Compression Ring
4.0
Nice GSO Diagonal
Needed another good 1 1/4" diagonal. I purchased a GSO 1 1/4" diagonal with a compression ring. This is a nice good quality diagonal and I use it all of the time.
GSO 2
GSO 2" 90-deg 99% Quartz Dielectric Mirror Diagonal for Refractors
5.0
GSO 2" diagonal
Works as advertised. Excellent views. Holds all my 2" eyepieces securely. Nice product at a very reasonable price.
GSO 1.25
GSO 1.25" 90-deg 99% Dielectric Mirror Diagonal with Compression Ring
5.0
GSO 1.25" 90-deg 99% Dielectric
very good
GSO 2
GSO 2" 90-deg 99% Dielectric Mirror Diagonal for Refractors
5.0
GREAT 2" MIRROR DIAGONAL YIELDING OUTSTANDING LIGHT THROUGHPUT
I HAVE OWNED MANY 'ENHANCED' MIRROR DIAGONALS FROM 1 1/4" TO 2". I'VE OWNED MOST ALL FROM EVERY MANUFACTURE YOU CAN NAME, AND SOME YOU CAN'T. THIS IS A STELLAR PERFORMER AT A GREAT PRICE! I USE THIS IN A GSO 6" CASS...
GSO 2
GSO 2" 90-deg 99% Dielectric Mirror Diagonal for SCTs
5.0
Heavy, but very good
I got this diagonal to be able to sin: to use my C6 with my 2" 20mm 82° Meade UWA eyepiece AND my Meade F6.3 reducer. It worked and I enjoyed the view of the Pleiades (it's so much better than with the equivalent 32mm Plössl). However, be...
GSO 2
GSO 2" 90-deg 99% Quartz Dielectric Mirror Diagonal for SCTs
5.0
Quality Quality Quality
Makes the stock diagonal feel and look like a toy...
GSO 1.25
GSO 1.25" 90-deg 99% Dielectric Mirror Diagonal with Compression Ring
5.0
Bright
Needed a new better diag than what came with the scope. Tried the GSO and it is every bit as bright as my Televues.
GSO 1.25
GSO 1.25" 90-deg Mirror Star Diagonal for Refractors # GSST
5.0
GSO Star Diagonal 1.25"
Purchased it when it was on sale for $27. What a bargain, well built and high light reflectivity. Agena Astro ships fast and it's free. Top notch service and free shipping. Agena Astro can't be beat. This star diagonal I purchased for $2...
GSO 1.25
GSO 1.25" 90-deg 99% Dielectric Mirror Diagonal with Compression Ring
5.0
Well made diagonal
In getting an old Jaegers refractor back into service I needed a diagonal that would do justice to the optics, but that I wouldn't mind having the barrel scuffed by the friction-fit focuser, and this hit a perfect price point for that goal. This...
Baader 2
Baader 2" Clicklock Mirror Star Diagonal # MAX-2C 2956100
5.0
Great product, great price, fast
Great product, great price, fast shipping. What more could you want.
GSO 2
GSO 2" 90-deg 99% Dielectric Mirror Diagonal for Refractors
5.0
Diamond in the rough
A very good quality diagonal with two unique and advantageous features - a zero stack height 1.25" eyepiece adapter, and a non-tapered nosepiece without safety grooves. Excellent value!
William Optics SCT Thread Adapter for 2
William Optics SCT Thread Adapter for 2" Diagonal
5.0
Great SCT to 2”
This adapter minimizes back focus added to the optical path. I purchased this to attach to Orion’s 2” dielectric diagonal directly to the back of my 150mm MAK. This adapter also allowed me to add a focal reducer without having any focusing issues...
GSO 2
GSO 2" 90-deg 99% Dielectric Mirror Diagonal for Refractors
5.0
Great service
Got the diagonal. Perfect shape and shipped fast. I'm happy!
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
A great diagonal from Baader Planetarium
This is a well made prism diagonal that works well with my home-built 75mm f/5 refractor telescope- with the fast focal ratio there is some noticeable CA but only at higher magnifications - I use the scope for low to medium power views primarily on o...