Probably 240 mm. 1.4 would be a good factor for you. 180 240 360 on 4X5 5X7 8X10 respectively would have very close aspect ratios.
Type: Posts; User: Jim Galli; Keyword(s):
Probably 240 mm. 1.4 would be a good factor for you. 180 240 360 on 4X5 5X7 8X10 respectively would have very close aspect ratios.