leighton_mcdonnell

Out of interest what is the most powerful portable flash I can buy (second hand). I think it must be the Metz 60 in terms of light output, reading around..

Hi I realised 20 minutes after posting thread that all I needed to do was move the flash 7 inches (length of bellows extension) and calculate the aperture difference. It was just 16.7 and 16.8 for iso 100 (but slightly more for iso 400 (0.2) in large living room. Incidentally I always use a bulb release not the cable release. The latter will cause camera shake. This is easily seen if you try both with the camera (such as an old 35mm or blad) plonked in a cheap kitchen scales (the ones where the scale dial quivers before settling) and check out the scale of needle needle quiver from each cable. The quiver from the 500cm was a shocker. if I remember from either release.even with the mirror up, simply because the release is not connected directly to the lens like a large format.. Many thanks for all replies.

Hi I have just dug out my Gowland 4x5 and an old notebook after a few years with digital but may have forgotten some basic formulas. I may have to waste some film I think but if I photograph at night with flash only and: Focus on a subject say at 60" (measured from film holder to subject) do I have to compensate for exposure (using flashmeter) if flash (Metz 45) on full power (manual) is closer to subject than the film (such as adjacent to to lens on its own tripod). I have a suspicion I do. Is there a formula for calculating this or simply trial and error. Many thanks Leighton