Back-Focus 101: The Petzval Lens ft. William Optics RedCat51

In this episode of back-focus 101, I show how to obtain proper back-focus on the Petzval, using the William Optics RedCat51 as an example. This is probably the easiest system to obtain proper back-focus, as you will see in the video.

Are you interested in knowing how filters affect your back-focus? Back-Focus 101: How Filters Affect Ba...

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