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View the Latest Diagonals & Prism Reviews
Item
Submitted By
GSO 1.25" 90-deg Erect Image Amici Prism Diagonal # PD90
Right Angle Erect Image Prism
I needed a right angle erect image prism for my 70mm 2 element EDS grab-and-go refractor. Cost was a driving factor in my choice. For the price, this item met all my requirements and provides excellent images for both terrestrial and astronomical ima...
I needed a right angle erect image prism for my 70mm 2 element EDS grab-and-go refractor. Cost was a driving factor in my choice. For the price, this item met all my requirements and provides excellent images for both terrestrial and astronomical ima...
Baader 2" 90° Erecting Amici Prism Diagonal with 1.25" Eyepiece Adapter # AMICI-2 2956152
Great upgrade for terrestrial (and celestial) viewing!!!
I spent the weekend researching various spotting scopes only to see words like, “Good Image quality for the money”, “sharp images at 20x, but expect a degraded image around 60x”, “acceptable image for this price range”. I thought these we...
I spent the weekend researching various spotting scopes only to see words like, “Good Image quality for the money”, “sharp images at 20x, but expect a degraded image around 60x”, “acceptable image for this price range”. I thought these we...
GSO 1.25" 90-deg 99% Dielectric Mirror Diagonal with Compression Ring
sturdy and convenient
sturdy and convenient
sturdy and convenient
William Optics 1.25" 90-deg Erecting Prism Diagonal with Helical Focusing # D-EP90-125
Great Quality
As usual, the fit and finish is Wiliams Optics awesome. I don't care for the grease selection for the helical focuser. It is a little too thick for my liking and that is at room temperature. It may be a little more stiff in cold temps. Hopefully...
As usual, the fit and finish is Wiliams Optics awesome. I don't care for the grease selection for the helical focuser. It is a little too thick for my liking and that is at room temperature. It may be a little more stiff in cold temps. Hopefully...
Baader T-2 90° 32mm Prism Diagonal with 1.25" Nosepiece and Eyepiece Holder # PRISM-1...
Excellent Optics Excellent Mechanicals
Little or no scatter from the prism, crisp precise voews. The helical fine focus adjustment is a nice touch.
Little or no scatter from the prism, crisp precise voews. The helical fine focus adjustment is a nice touch.
GSO 2" 90-deg 99% Dielectric Mirror Diagonal for Refractors
Great star diagonal
Robust quality product at a good price. Works well with my Baader Hyperion zoom eyepiece. Great service with Agena.
Robust quality product at a good price. Works well with my Baader Hyperion zoom eyepiece. Great service with Agena.
Tele Vue 1.25" 90-deg Everbrite Star Diagonal # DPC-1250
Usual Tele Vue Excellence
Besides the look and feel of quality, the fact that these are made from a solid piece of metal and do not have screw-on barrels is a major plus, as they do not come loose and swivel when in place.
Besides the look and feel of quality, the fact that these are made from a solid piece of metal and do not have screw-on barrels is a major plus, as they do not come loose and swivel when in place.
Baader T-2 90° 32mm Prism Diagonal with 1.25" Nosepiece and Eyepiece Holder # PRISM-1...
Incredible contrast!
bought this a few weeks ago and as below, mine was screwed down pretty tight as well but came loose with some elbow grease. the first thing I noticed about this prism diagonal in comparison to my dielectric was that the diffraction rings during colli...
bought this a few weeks ago and as below, mine was screwed down pretty tight as well but came loose with some elbow grease. the first thing I noticed about this prism diagonal in comparison to my dielectric was that the diffraction rings during colli...
Baader 2" Clicklock Mirror Star Diagonal # MAX-2C 2956100
A mixed bag compared to alternatives...
The Baader 2" Clicklock Maxbright diagonal is a mixed bag. I'll start with the positives. It has a short nosepiece. Why is this important? When used with an SCT in particular this reduces backfocus compared to a longer "refractor styl...
The Baader 2" Clicklock Maxbright diagonal is a mixed bag. I'll start with the positives. It has a short nosepiece. Why is this important? When used with an SCT in particular this reduces backfocus compared to a longer "refractor styl...
Tele Vue 2" 90-deg Everbrite Star Diagonal # DSF-8002
Top of the Line
There is no better diagonal for one compelling reason: the fittings are part of the housing. I finally tired of struggling to tighten and re-tighten the connection between the fittings and body of my old diagonal. Positioning of my heavier eyepieces ...
There is no better diagonal for one compelling reason: the fittings are part of the housing. I finally tired of struggling to tighten and re-tighten the connection between the fittings and body of my old diagonal. Positioning of my heavier eyepieces ...
Tele Vue 2" 90-deg Enhanced Aluminum Star Diagonal # DSC-8001
Tele Vue 2 inch diagonal--Enhanced Aluminum
I bought a second one of these to use primarily with Celestron SCTs. I have a Tele Vue 85 that came with the Everbrite version and have been able to compare them side by side over an extended period of time. For lunar and planetary viewing, I actuall...
I bought a second one of these to use primarily with Celestron SCTs. I have a Tele Vue 85 that came with the Everbrite version and have been able to compare them side by side over an extended period of time. For lunar and planetary viewing, I actuall...
GSO 2" 90-deg Mirror Diagonal for Refractors
Great product
Totally impressed with the performance of this 2 inch diagonal.Well built and a great value for the dollar.
Totally impressed with the performance of this 2 inch diagonal.Well built and a great value for the dollar.
Celestron 1.25" 45-deg Erect Image Diagonal # 94112-A
The product will make my
The product will make my scope usable for sporting and daytime viewing.
The product will make my scope usable for sporting and daytime viewing.
William Optics SCT Thread Adapter for 2" Diagonal
Williams Optical SCT to 48mm adapter
Beautifully made, even though it serves a simple function. Engages with 4 full revolutions, very strong.
Beautifully made, even though it serves a simple function. Engages with 4 full revolutions, very strong.
GSO 1.25" 90-deg Mirror Star Diagonal for Refractors # GSST
Awesome Value
I have always had good luck with GSO products. They make a quality product at all levels for a fair price. This diagonal has a plastic body and metal barrels. I actually wanted something lighter to use with my 80mm Short Tube refractor. There is not ...
I have always had good luck with GSO products. They make a quality product at all levels for a fair price. This diagonal has a plastic body and metal barrels. I actually wanted something lighter to use with my 80mm Short Tube refractor. There is not ...
William Optics 1.25" 99% Dielectric Dura Bright Carbon Fiber Star Mirror Diagonal
W.O. diagonal
Very good quality mirrors and quality built.
Very good quality mirrors and quality built.
GSO 1.25" 90-deg Erect Image Amici Prism Diagonal # PD90
GSO 1.25 90° ERECT
GSO optical products offer excellent craftsmanship, and value.
GSO optical products offer excellent craftsmanship, and value.
Baader T-2 BBHS Dielectric Mirror Diagonal Body # MAX-1S 2456103
Used with NV devices
I bought this diagonal specifically to observe the ancient stars of globular and some open clusters. These stars put out most of their light beyond visible wavelengths where dielectric coatings have no reflectivity. It has met my expectations easily ...
I bought this diagonal specifically to observe the ancient stars of globular and some open clusters. These stars put out most of their light beyond visible wavelengths where dielectric coatings have no reflectivity. It has met my expectations easily ...
Baader T-2 90° Prism Star Diagonal Body # T2-01C 2456005
T2 32mm Prism diagonal
I purchased this to help reduce focal length for my C8 when using binoviewers. I am using it with the Baader 15mm SCT to T2 adapter and a T2 adapter that screws in to my binoviewer. Works like a charm. Views have improved and the connections are rock...
I purchased this to help reduce focal length for my C8 when using binoviewers. I am using it with the Baader 15mm SCT to T2 adapter and a T2 adapter that screws in to my binoviewer. Works like a charm. Views have improved and the connections are rock...
Meade Series 5000 2" Enhanced Dielectric Diagonal w/ SCT Adapter # 07680
Happy Camper
Great choice to upgrade from the kit diagonal that was included with my scope. The 99% transmission provide excellent views and contrast. The blue plates provide an esthetical accent and the included adapter an increased functionality.
Great choice to upgrade from the kit diagonal that was included with my scope. The 99% transmission provide excellent views and contrast. The blue plates provide an esthetical accent and the included adapter an increased functionality.
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