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02/15/2004 12:20:21 PM · #1 |
Well i wanted opinion of members that if i take reading of external studio strobes using a flash metre that i use with film slr , will those reading be good for my a40 , reason i am asking is that some one told me digital f-11 is like say f-64 of film, i did not argue with him but it did not make sense to me
are there any flash metre for digital cameras |
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02/15/2004 01:48:43 PM · #2 |
| I use a strobe meter occasionally, (Sekonic DigiLite F) and use the readings from it without adjustment, but I have noticed that with digital camera and my strobes that I have quite a bit more latitude. I have not heard that digital F stops are different than film F stops. |
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02/15/2004 01:51:48 PM · #3 |
The aperture f stop values with most non-slr digital cameras do not match up to the SLR stop values. The meter will not correspond.
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02/15/2004 02:21:11 PM · #4 |
The exposure readings from a flash meter will work for any format camera. If the meter tells you to shoot at f5.6, f5.6 will give you the correct exposure if you are shooting digital, 35mm, med format, or large format.
Your friend my have been referring to the DOF. Since the focal length of most digicam lenses is shorter than the 35mm equivalent, they will tend to have more DOF at a given aperture.
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02/15/2004 10:20:03 PM · #5 |
i may have forgotten to mention that lights i use were totally meant for film slr, they are prolichrome .
Well now i am still confused as opinion to my post are divided as to f stop being same or not.
Well i anted to buy a new flash metre with can also measure ambient light , any suggestions, my budget is not alot but i like a metre that is good and worth its price, well in India kind of metre am looks starts from 260$ on wards and we mainly get minolta, i gues some model called minolta IV or something |
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02/15/2004 11:21:32 PM · #6 |
I don't use external meters, so I'm not an expert. But since the sensitivity of digital sensors is calibrated to film ISO standards, there should be nothing inherent in the use of electronic vs chemical means to record photons. Digital sensors are generally smaller, so have a larger DOF than film for a given f-stop; as Spazmo99 mentioned, that may have been what your friend is referring to. But if the same meter works for 35mm, medium, or large format without special settings, it should work for digital as well.
A nice feature of digital is that it is easy to experiment. So give it a try, and let us know how it works out! |
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02/16/2004 05:24:07 AM · #7 |
Originally posted by jmsetzler:
The aperture f stop values with most non-slr digital cameras do not match up to the SLR stop values. The meter will not correspond. |
The term 'f-stop' expresses the ratio between the diameter of the iris and the focal length of the lens. It is actually a fraction with the numerator omitted. Thus a lens with a focal length of 50mm and a iris diameter of 50mm (1/1) would be an f1 lens. A lens with a focal length of 200mm and an iris diameter of 50mm (1/4) would be an f4 lens.
A compact digital camera may have a zoom lens expressed as 35-105mm in 35mm terms but it is actually much smaller than this, 5.4-16.2mm in the case of the Canon A40. The lens is quoted as being an f2.8 lens at the shorter length simply because this is the ratio between focal length and iris diameter. A side-effect of this smaller iris diameter is an increase in the depth of field.
In short an f-stop is the same across all formats (35mm, APS, 6x7, etc), subject to the manufacturing tolerences, but the DOF will differ.
Corrected a typo, left the others for later ;)
Message edited by author 2004-02-16 05:30:07. |
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