Just a note for anyone considering an erecting Diagonal

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skyhawk
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Joined: Tue Dec 05, 2017 11:53 am
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Just a note for anyone considering an erecting Diagonal

Post by skyhawk »

Just a note for anyone considering an erecting Diagonal

I am getting a 72mm Ed Skywatcher to attach my Quark Daystar filter for solar work.

Thinking that it will make a decent carry about scope, birds, terrestrial etc I decided to but an erecting diagonal, Ostara.

Now I appreciate that there are GOOD ones out there but for what I want it for £80 was a decent price, and as stated in the adverts it is a "Ostara 2'' 45 degree Erecting Prism for Telescope with 1.25'' Adaptor" on Amazon.

IT IS NOT A 2" DIAGONAL, BE WARE, in fact I paid £50 on Ebay so happy but it is NOT as described.

It is in fact a "Diagonal capable of accepting 2" eyepieces and NOT a 2" diagonal".

As a buyer and contracts officer I have always been ware of such "CONS".

If you look at the images you will see that my dialectric diagonal has a FULL 2" of CLEAR aperture, where as the Ostara is "stopped down" to 1.25" allowing for the fixing of the "prism" rather than a mirror, which is fine but really limits FOV and light gathering.
IMG_20180906_120042704[1].jpg
IMG_20180906_120042704[1].jpg (75.11 KiB) Viewed 1655 times
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IMG_20180906_120657007[1].jpg (130.55 KiB) Viewed 1655 times
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IMG_20180906_120705863[2].jpg (122.34 KiB) Viewed 1655 times
Celestron 8" Edge HD Evolution, Esprit 120mm triplet, 72mm APO, Sky Tee 2, 6" reflecting scope, William Optics Binoviewer, Quark Daystar Ha Chromosphere on 72mm ED, LVW8mm eyepiece and Celestron 19mm Axiom, matched W.O 10 and 20mm, and a few others, D4s, D810,

For info, I am Autistic, Aspergers, ADHD, therefore if I come over as a little "short" on occasions it is not intended, thank you
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