I currently have a Calumet 90 f/8 lens for my 4x5. I know that it's dark and hard to see with, but yesterday was an overcast day and I was trying to photograph with it, and I literally could not see to focus. I'm 23 years old, so I know it's not my eye sight. I would like to upgrade to either a 90 f/5.6, or 90 f/4.5. I don't backpack much, so weight is not an issue. I understand that the 4.5 will cost more also. My question is, as for viewing on the groundglass, how much difference will I see going from my f/8 now to a f/5.6? And would I gain even more by going with the f/4.5?
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