08-13-2010, 09:44 PM
[quote name='Brightcolours' timestamp='1281708452' post='1745']
Nice that you "seriously doubt that", however it sort of is true. Of course, because of the many different aspects at play, results "may" differ slightly, it still is true that it does not matter in your case.
Whether you use the excellent Canon TS-E 90mm f2.8 with an extension tube, or the slightly less excellent Nikon 85mm f2.8 PC D, the light loss at the same distance will be more or less the same with each setup.
Point being: It is not the extension tubes which make you lose light, it is the close up focussing that extension tubes cause.
The discussion you linked to does not tell much... you did not actually measure the exposure for real, nor do we know how much the focal length changes per lens, for instance.
[/quote]
It's actually not "sort of true", its a law of physics, and therefore true for the world we live in, as it is built according to the same set of physical laws this is part of.. Focal length actually has nothing to do with this, see my reply to Yakim.
Kind regards, Wim
Nice that you "seriously doubt that", however it sort of is true. Of course, because of the many different aspects at play, results "may" differ slightly, it still is true that it does not matter in your case.
Whether you use the excellent Canon TS-E 90mm f2.8 with an extension tube, or the slightly less excellent Nikon 85mm f2.8 PC D, the light loss at the same distance will be more or less the same with each setup.
Point being: It is not the extension tubes which make you lose light, it is the close up focussing that extension tubes cause.
The discussion you linked to does not tell much... you did not actually measure the exposure for real, nor do we know how much the focal length changes per lens, for instance.
[/quote]
It's actually not "sort of true", its a law of physics, and therefore true for the world we live in, as it is built according to the same set of physical laws this is part of.. Focal length actually has nothing to do with this, see my reply to Yakim.
Kind regards, Wim
Gear: Canon EOS R with 3 primes and 2 zooms, 4 EF-R adapters, Canon EOS 5 (analog), 9 Canon EF primes, a lone Canon EF zoom, 2 extenders, 2 converters, tubes; Olympus OM-D 1 Mk II & Pen F with 12 primes, 6 zooms, and 3 Metabones EF-MFT adapters ....