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The lens is a Nikkor-W 135mm f/5.6, about 7 years old. I have found it to be very appropriate for portraits.

Hi Bob, thanks, I am working with a 135mm lens, generally stopped down between f8 and f16. I shoot at a variety of distances, and what I've noticed is that the closer photographs (head and...

So far the issue is only partially solved. I did adjust my loupe as per Bob's suggestion, and that was helpful. The focus tests also seemed to come back ok. However, I am still loosing more images...

Great, this is helpful. When I adjust my loupe I can focus either on a sand pattern (which I assume is the grain of the glass?) or on a series of concentric thin black lines (the fresnel?). I...

Thanks to everyone for your thoughts.

I ran some tests based on Brian's and Vaughn's suggestions and I should have the film back in the next few days.

Bob, I'd like to ask you to clarify your...

Shooting with 2 Wista 45DX field cameras (4 and 6 years old, new when purchase, original Wista fresnel screens)
Primary lens: Nikkor-W 135 mm f/5.6
Secondary lens: Nikkor-W 105 mm f/5/6
Loupe:...