I also have some issues with certain focal lengths on specific formats. For 4x5, I find (as Vaughn does), a progression of 90/150/210/305 to be about right. Sometimes if wanting to travel as light as possible with 4x5 I'll just take a 135 - but lately this FL is being supplanted with the 150 for this (single lens) use...as the 135 somehow seems a bit boring to me lately on 4x5.
As for 5x7...while I now go with a 110/150/210/305, with very occasional use of the 90, it is the 110 and 150 which I as of yet have not quite warmed up to completely for this format.
When I'd recently acquired the (optically wonderful) 110XL with the intention of using this to basically "replace" my 120mm F/8 Super Angulon, thinking that they'd be "close enough" in FL, I often find myself missing the very slightly longer 120. This preference might change over time and I may yet thoroughly embrace the 110, but for now, I'm hanging to that 120!
The other "jury is still out" FL for 5x7 is the 150. Often I think I'd be happier with something like a 165, but the modern options here are so few...with the 165 SA being a bit large and heavy, and the quality of the older WA Dagors being quite variable - also keeping in mind my tendency to print quite large (to 40x60 inches). At any rate, were I more in love with the 150 for use with 5x7, I'd possibly be wanting to sell my current 150 Apo Symmar L and looking for an Apo Sironar-W...mostly for its extra bit of coverage. Too bad that lens is getting really hard to find, and almost always really pricy.
Finally...another FL which I've long had thoughts of acquiring is the 450, preferably in the form of either a Nikkor-M or Fujinon-C. But it always seems that whenever I do see either of these come up for sale, some financial contingency magically materializes. Why is that
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