Useless, just use calculator
No way to store the information about your telescopes and eyepieces. You should be able to easily select a scope and eyepiece from your collection, and see the magnification, TFOV, and exit pupil. To have to put in the info each time is ludicrous. I’d feel taken if this free. That it’s a paid app is unforgivable.
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Great Updates and Improvements
Great improvements and updates for this app. Now utilizing modern iPhone features to help astronomers.
Terrible
Don't waste your dollar. If you've updated your phone since 2011, then the app will not even open. Shame on the developer for not keeping the app updated, and shame on Apple for not removing the app from the App Store. If I could I'd rate this app -5 stars.
Not really happy with it
Its simple and the key pad is a good idea. But this calculator requires you know your f ratio in millimeters. I can figure that out, but I think a good calculator should not require you provide some of the calculating yourself. Any scope owner would know their mirror size in inches and focal length f ratio, calculating from those figures would be more useful.
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