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 Atlas and other sky charts to locate objects.

This review was provided courtesy of AgenaAstro.com

5.0 A TRUE BARGAIN

This 2" diagonal is an excellent quality device at half the price you'd pay for a "brand name".

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4.0 Prisme redresseur à 90°/1,25" = 90/1,25" Erecting prism

Un bon produit qui remplace le modèle de la marque Celestron, que l'on ne trouve plus qu"en occasion.
The Celestron erecting prism (same function) is no longer avalaible. This model is a solution of replacement ; it works correctly and i don't see remarkable defaults.

This review was provided courtesy of AgenaAstro.com

5.0 Use it in my main scope

I live in heavy LP and thought a RACI might make finding objects a bit easier while starhopping. Since I have a good quality finder, I thought I'd try this diagonal before buying a RACI. After I received it, I figured I'd try it in my 120mm F/5 refractor as an experiment since I can't see very deeply with my finder anyway. I like using it so much in my main, that I haven't even tried it in my finder.

I don't see any ghosts, lines, additional aberration, etc. This is a good quality diagonal at a very reasonable price.

This review was provided courtesy of AgenaAstro.com

5.0 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 images.

This review was provided courtesy of AgenaAstro.com

5.0 GSO 1.25 90° ERECT

GSO optical products offer excellent craftsmanship, and value.

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5.0 Excellent correct image diagonal

Some correct image diagonals, because of the Amici prism corner show a line in the image. Not this diagonal. The image is very clean and sharp with no artifacts to be seen. A very good price too!

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5.0 90 degree Right Image Diagonal

A good value for the money. Works good for bird watching and even show a good image when stargazing.

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5.0 Excellent value!

Great diagonal for a beginning stargazer! Bought for a scope I was giving to my grandson. The quality and performance was excellent for the money.

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5.0 GSO Diagonal prism

Compact,Easy to Use,Lightweight,Strong Construction

After trying this prism, I can say it is quite good quality and usable for astronomy too (like Jupiter) . I didn't see that this correcting left and right prism would degrade quality of observation more than regular one ..

This review was provided courtesy of AgenaAstro.com

5.0 Very well made

Quality Lenses

I bought this for use with my Travel Scope 70. The images are amazingly crisp. I have another brand of Amici prism that I purchased decades ago for more money than I just paid for the new one.
The old Amici prism shows flare on bright objects. The new prism has yet to display any such flare.
I was so impressed that I ordered a second unit. The second unit proved to be just as good as the first. I'm using that one on another small scope. This is a high quality unit despite it's modest price. I'm very pleased.

This review was provided courtesy of AgenaAstro.com

4.0 Money well (smartly) spent

Strong Construction,Quality Build For The,Lightweight

I have a 400 mm refractor Omni Vista Spotter that I purchased many years ago from Orion. I needed an erect prism to bird watch in my back yard as I an surounded by trees.The prism that I purchased is perfect for daytime use as well as occasional looks at the moon.

This review was provided courtesy of AgenaAstro.com

5.0 A Best Buy, Hands Down...

Lightweight,Easy to Use,Strong Construction,Accurate,Quality Lenses,Compact

None

I purchased this 90

This review was provided courtesy of AgenaAstro.com

4.0 Better than I had imagined

Quality Lenses,Lightweight,Compact,Accurate

Having been an amateur astronomer and bird watcher for many decades, this diagonal far exceeded my expectations for such an inexpensive item. I note no doubling, nor roof artifacts, even at high powers.

This review was provided courtesy of AgenaAstro.com

4.0 Good value

Quality Lenses

The amici line on most low cost amici prisms is commonly visible. This is one low cost amici prism that is cut so well the amici line is not visible.

This review was provided courtesy of AgenaAstro.com

5.0 Great Images at Minimal Cost

Lightweight,Strong Construction

Well 40 years ago I bought a war surplus (WW2) prism and made my own Amici diagonal for my astronomical telescopes. The one I made works fine but it is very difficult to change eyepieces. They slide in and out with a lot of friction. Recently I bought a new 150mm RFT and wanted to replace the diagonal mirror that came with it with an Amici. Agena Astro came to the rescue with this modestly priced erect image diagonal. The eyepieces can be changed out easily with the provided thumb screws. Thanks Agena Astro for an excellent product.

This review was provided courtesy of AgenaAstro.com

5.0 Just right for the range

Easy to Use,Quality Lenses,Strong Construction,Lightweight,Accurate,Compact

Using this on a Celestron 52268 C90 Mak Spotting scope with an Alpen table top tripod. All I have to do is raise my head a little, turn it and I can see perfectly down range. This 90 degree prism lets me set the scope/tripod back far enought it no longer crowds my elbow like a 45 degree one does.

This review was provided courtesy of AgenaAstro.com

5.0 Excellent diagonal from GSO

Quality Lenses

None

Very dialectical quality, though it is not. The wavelength is 1 / 10, I am very satisfied with its performance, given the price. Thanks GSO
Sepi61

This review was provided courtesy of AgenaAstro.com

4.0 Very nice, lightweight star diagonal

Very good mirror, lightweight, best value in star diagonals out there.

Nothing specific, maybe the plastic housing.

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 reflectivity measure, buy it for its wave measure, with a 1/10 wave mirror being better than, say, a 1/4 wave mirror. The wave function is a measure of the surface accuracy of the mirror. In practice you are going to hardly notice a difference between a 99% reflectivity diagonal and one that comes in at 92% reflectivity--believe me I've compared them. But you will notice a difference in wave front error, particularly on finer details of planets or the moon, or when trying to split double stars and the like. I have mixed feelings about the plastic housing of the diagonal--I worry a little about its long term durability--but it is lightweight and of course keeps the cost of this otherwise great little performer down. If you are looking for a good starter diagonal this is the one.

5.0 GSO 1.25" 90° Mirror Star Diagonal

Fine optics, light weight, good buy!!

No bad reviews!!

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!!