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Calculating Back Focus/Metal Back Distance

Posted by Jon Minnick and Rayna Bauer on

In this entry we discuss precisely what "Back Focus" or "Metal Back Distance" is within astrophotography. We have also created a useful calculator tool to be able to determine your back distance needs for your own system!

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How many stops between two f/ratios?

Posted by Stephanie Anderson on

Faster is better! Ever wonder how much quicker you'll be able to able to image with a reducer? Considering a faster scope? Try our handy-dandy calculator to find out just how much time you'll be saving. Enter your two f/ratios for comparison in the fields below.

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