Hi all......I'm just in the process of finishing off a home-made lensboard for my new 240mm g-claron so I can use it with my V8 Deardorff. Whilst playing around, I fitted the lens with the front element only and the image looked okay on the ground glass somewhere just less than 480mm is my estimate. I don't remember reading anywhere that others have done this, so my questions are......am I missing something obvious, and I have an inkling that I've read that exposure compensation is required. Why? and how much? In easy to understand terms obviously. Thanks as always, Dave.
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