Dear photographers, I am new to LF photography. Can someone explain why larger focal length lenses with f5.6 exposure come with heavier shutters (like copal #1 or #3) supporting smaller minimum shuttertime (< 1/125 sec or < 1/200 sec) instead of 1/500 sec with copal #0?
I want to use a 240 mm f5.6 lens for portraits on location on a 4x5 inch camera using 5.6 for very small depth of fields. In bright light circumstances I expect to use 1/500 sec shuttertime otherwise I have to use very slow film. Moreover, the use of f/5.6 over for example a f/9.0 lens gives more than one stop brightness on the groundglass, which I do prefer more than the lesser weight of a f/9.0 lens.
If no such lens exists (240 mm f/5.6 copal #0), or if no such shutter exists (range up to 1/500 sec) that will support the lens, would you be so kind as to give me an advice on a good 240 mm f/9 copal #0 lens?
I read on Kerry Thalmann (http://www.thalmann.com/largeformat/future.htm) that the 240mm f9 Fujinon A is a good option.
Thank you for advising me.
With kind regards,
Jeroen Snel
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