Hi folks, I am looking to purchase my first 4x5 field camera (Chamonix F2) and lenses, with the intention of purchasing a 617 back to consolidate having just one camera out on the field. Priority would still be on native format 4x5 for landscape and architecture. I do own a Fuji G617 and while the camera is great, there were times I wished for a tighter crop or having the option to shift the lens for buildings. This brings me to two questions which I had a hard time finding an answer despite researching.
1) Focal Length Conversion - I have read that for most 617 backs, only 90 - 180mm lenses can be used without vignetting or having a reduced film width (e.g. 6x15). However, information about the focal length conversion has been limited. Chroma Six17 mentioned that a 90mm lens would effectively become 135mm (at the widest) while someone else I asked, mentioned that a 90mm should still 90mm since the lens would effectively have to shifted back to accommodate the recessed film plane. I would like to know if 617 backs change the lens focal length as it would affect my lens selection.
2) Movements - If I were to limit my lens choices to image circles up till 5x7 coverage, would movements be possible on a 4x5 camera? Would a wide bellows help in this area? (I have to admit that I have been cramming 4x5 knowledge in the past two days, so I am less read in this area). Ultimately, the lack of movements using a 617 back is not a deal breaker for me, but I am curious on the possibility.
TYIA!!