I'm having a difficult time using this lens on 8x10 and am wondering if anyone can give me any advice? I've only used this lens a handful of times and cannot managed to make a sharp picture with it. This is the first lens of this focal length I've owned or used--using wider lenses, I have never had an issue focusing; using movements to get near and far in focus; etc. With my 240mm lens, I can get a wide foreground, background photo in focus in a matter of seconds. With this 19" Artar, I always seem to have a small section out of focus. Below I've attached a couple of poor quality pictures of negatives as an example. Could the issue be that the longer focal length is more difficult to get every thing in sharp focus? Could there be an issue with my lens? I've double checked that the cells are in the correct order.
And just to add a bit more info... my lens is one made right before the red dot series. It is coated and factory mounted on an ilex shutter, but no red dot.
Thanks for any help!
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