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View the Latest Diagonals & Prism Reviews
Item
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GSO 2" 90-deg 99% Quartz Dielectric Mirror Diagonal for SCTs
GSO IS A GOOD CHOICE
Very bright mirror, well constructed diagonal, you tighten the ring around your lens barrel so you are not digging a hole into your beautiful lens barrels as you are with the diagonals supplied with most scopes from the factory. The body is very heav...
Very bright mirror, well constructed diagonal, you tighten the ring around your lens barrel so you are not digging a hole into your beautiful lens barrels as you are with the diagonals supplied with most scopes from the factory. The body is very heav...
GSO 1.25" 90-deg Erect Image Amici Prism Diagonal # PD90
Very nice, lightweight star diagonal
Don't be put off by the no-frills, plain plastic body of the GSO 1.25 star diagonal, it's a great little performer and an excellent value. The real selling point for this little star diagonal is its 1/10th wave mirror. Don't buy a diagonal for its r...
Don't be put off by the no-frills, plain plastic body of the GSO 1.25 star diagonal, it's a great little performer and an excellent value. The real selling point for this little star diagonal is its 1/10th wave mirror. Don't buy a diagonal for its r...
Mar 14, 2009
GSO 1.25" 45-deg Erect Image Amici Prism Diagonal # PD45
Correct image
This is the diagonal I use the most, I have a window on my office that looks to the ocean and I like this diagonal on my 80mm refractor (that lives there) just to look ships on the horizon, also the greenflash is stuning. I love to see things on the ...
This is the diagonal I use the most, I have a window on my office that looks to the ocean and I like this diagonal on my 80mm refractor (that lives there) just to look ships on the horizon, also the greenflash is stuning. I love to see things on the ...
William Optics 1.25" 45-deg Erecting Prism Diagonal
A Fine Erecting Diagonal
I wanted a 45 degree erecting diagonal to use with my 6" f5 achro. I have a nice 90 degree diagonal for stargazing, and the erecting diagonal was to be for casual terrestrial use. First I tried a model from one of the major mass astro sellers. It did...
I wanted a 45 degree erecting diagonal to use with my 6" f5 achro. I have a nice 90 degree diagonal for stargazing, and the erecting diagonal was to be for casual terrestrial use. First I tried a model from one of the major mass astro sellers. It did...
GSO 2" 90-deg Mirror Diagonal for SCTs
Very well made, Nice upgrade
Purchased for C8 to replace a stock 1 1/4. The stock diagonal had visible distortion and smearing when attempting collimation - (sigh) disappointing but pretty much junk. If you are wondering why during collimation you get long rainbow looking smears...
Purchased for C8 to replace a stock 1 1/4. The stock diagonal had visible distortion and smearing when attempting collimation - (sigh) disappointing but pretty much junk. If you are wondering why during collimation you get long rainbow looking smears...
GSO 2" 90-deg Mirror Diagonal for Refractors
Very Capable Product
I wanted a 2" diagnonal but felt the high prices for some of the "99%" reflectivity diagnoals was difficult to justify and based in part on hype. I am not an optics expert but I have doubts the human eye can really discern the difference between a 92...
I wanted a 2" diagnonal but felt the high prices for some of the "99%" reflectivity diagnoals was difficult to justify and based in part on hype. I am not an optics expert but I have doubts the human eye can really discern the difference between a 92...
GSO 2" 90-deg Mirror Diagonal for SCTs
A 2" Diagonal that fits every budget
I wanted to get my feet wet in 2" eyepieces, but didn't want to spend a lot of money without knowing if I would really like the 2" formats. This is a great value for those of you looking to sample the benefits of 2" wide field eyepieces. Its a step u...
I wanted to get my feet wet in 2" eyepieces, but didn't want to spend a lot of money without knowing if I would really like the 2" formats. This is a great value for those of you looking to sample the benefits of 2" wide field eyepieces. Its a step u...
Dec 8, 2008
GSO 2" 90-deg 99% Dielectric Mirror Diagonal for SCTs
Solidly built, good images
I bought this to replace the stock 1.25" diagonal that came with my second hand Nexstar 8 GPS, and I'm happy with my purchase. It seems to be solidly built, threads on very cleanly and I think the images are bit brighter than the stock diagonal. I ...
I bought this to replace the stock 1.25" diagonal that came with my second hand Nexstar 8 GPS, and I'm happy with my purchase. It seems to be solidly built, threads on very cleanly and I think the images are bit brighter than the stock diagonal. I ...
Nov 27, 2008
GSO 1.25" 90-deg Mirror Star Diagonal for Refractors # GSST
GSO 1.25" 90
This 90* is much better than the one that comes with your OEM refractor!! The images are more clear and it is about the same weight! The price is one of the best features for me!! All-round nice accessory!!
This 90* is much better than the one that comes with your OEM refractor!! The images are more clear and it is about the same weight! The price is one of the best features for me!! All-round nice accessory!!
GSO 2" 90-deg 99% Dielectric Mirror Diagonal for Refractors
Great diagonal
I got this to compare against the Astro-Physics Maxbright. In short, I kept the GSO and sold the Maxbright. The GSO had excellent fit and finish, and it has views which were every bit as sharp and bright as the Maxbright. The GSO also has the ability...
I got this to compare against the Astro-Physics Maxbright. In short, I kept the GSO and sold the Maxbright. The GSO had excellent fit and finish, and it has views which were every bit as sharp and bright as the Maxbright. The GSO also has the ability...
Nov 18, 2008
Celestron 2" SCT Mirror Diagonal with XLT coating # 93527
Celestron did just fine.
Until now I didn't think that the two big SCT manufactures knew how to produce, nor cared to produce, a decent diagonal. That is until now. Celestron's new 2" XLT diagonal does a decent job for sure. Mine came with the 14 XLT OTA I bought. I was read...
Until now I didn't think that the two big SCT manufactures knew how to produce, nor cared to produce, a decent diagonal. That is until now. Celestron's new 2" XLT diagonal does a decent job for sure. Mine came with the 14 XLT OTA I bought. I was read...
Jul 28, 2008
GSO 2" 90-deg Mirror Diagonal for SCTs
Solidly built, good images
I bought this to replace the stock 1.25" diagonal that came with my second hand Nexstar 8 GPS, and I'm happy with my purchase. It seems to be solidly built, threads on very cleanly and I think the images are bit brighter than the stock diagonal. ...
I bought this to replace the stock 1.25" diagonal that came with my second hand Nexstar 8 GPS, and I'm happy with my purchase. It seems to be solidly built, threads on very cleanly and I think the images are bit brighter than the stock diagonal. ...
Jun 2, 2008
GSO 2" 90-deg Mirror Diagonal for Refractors
Excellent diagonal at a winning price
This 2" 99% reflectivity dielectric mirror diagonal from GSO is a great performer. I compared it head to head with a buddy's William Optics 2" 99% dielectric diagonal using my Sky90. The William Optics diagonal is touted to have a 1/10th wave subst...
This 2" 99% reflectivity dielectric mirror diagonal from GSO is a great performer. I compared it head to head with a buddy's William Optics 2" 99% dielectric diagonal using my Sky90. The William Optics diagonal is touted to have a 1/10th wave subst...
Nov 9, 2007
GSO 2" 90-deg Mirror Diagonal for Refractors
Great diagonal
I got this to compare against the Astro-Physics Maxbright. In short, I kept the GSO and sold the Maxbright. The GSO had excellent fit and finish, and it has views which were every bit as sharp and bright as the Maxbright. The GSO also has the ...
I got this to compare against the Astro-Physics Maxbright. In short, I kept the GSO and sold the Maxbright. The GSO had excellent fit and finish, and it has views which were every bit as sharp and bright as the Maxbright. The GSO also has the ...
Jun 30, 2007
Celestron 1.25" 45-deg Erect Image Diagonal # 94112-A
Low quality...only for daytime use.
This is a very low quality prism that is really suited for daytime use only. Some of these cheap 45-degree prisms even say that in the instructions...only good for daytime use. They do okay in daylight, but you can get better quality prisms, al...
This is a very low quality prism that is really suited for daytime use only. Some of these cheap 45-degree prisms even say that in the instructions...only good for daytime use. They do okay in daylight, but you can get better quality prisms, al...
Jun 30, 2007
Celestron 1.25" 45-deg Erect Image Diagonal # 94112-A
Celestron 45° image erecting diagonal for 1.25”
I received a Celestron 45° Erect Image Diagonal as part of a trade deal a few weeks ago. After using it a few time I understand why the other guy so readily threw it in as part of the trade. IMHO this diagonal is of about the same quality as the $5...
I received a Celestron 45° Erect Image Diagonal as part of a trade deal a few weeks ago. After using it a few time I understand why the other guy so readily threw it in as part of the trade. IMHO this diagonal is of about the same quality as the $5...
May 30, 2007
GSO 1.25" 90-deg Erect Image Amici Prism Diagonal # PD90
GSO 1.25" 90° Mirror Star Diagonal
This 90* is much better than the one that comes with your OEM refractor!! The images are more clear and it is about the same weight! The price is one of the best features for me!! All-round nice accessory!!
This 90* is much better than the one that comes with your OEM refractor!! The images are more clear and it is about the same weight! The price is one of the best features for me!! All-round nice accessory!!
May 9, 2007
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