Using my light meter with my Nikon
Posted 31 August 2008 - 08:52 PM
I've been using my Sekonic L-758DR to measure exposure for my Nikon D50 still camera. The camera has the kit zoom lens on it. When I take an exposure, I find that when the lens is zoomed in, the image looks underexposed. The Camera's built in meter seems to compensate for this. So I have a few questions-
1. Why does this happen?
2. Is there a scientific way to compensate for this?
3. Should I be confident at all that shooting at what the meter tells me is actually correct with this lens?
4. What focal length should I be shooting at to get an accurate exposure to what the meter says?
5. How practical is it to take photos on set based on the measurements you get with the light meter to gauge how you want to expose the shot? Is this a common practice in the professional world?
Thanks a lot.
Posted 31 August 2008 - 09:58 PM
other than that there should not be a problem. also, make sure you light meter is calibrated correctly.
Posted 31 August 2008 - 10:06 PM
How under exposed are you talking? 1/3, 2/3, 1 stop? More?
Don't forget, negative film and a DSLR have differing dynamic ranges. Essentially if it's ok on the DSLR you'll be PERFECT on film.
And, also, Sekonics will have a slightly different middle gray than your spot meter on your camera may have. Plus, compression, JPEG, for example, can change as well as the settings on your LCD/Monitor.
Posted 01 September 2008 - 12:16 PM
I guess what you've been doing is the opposite of me -using my Nikon to get light readings for my 16mm camera. But as noted earlier, the kit lenses do not have the same max aperture throughout the zoom range. I rarely use zooms, but I believe you will get consistent results if you keep the aperture smaller than the smaller "max" aperture, ie. if your lens says 18-50mm f. 2.8-4.5 you need to keep it at aperutre 4.5 or smaller to avoid the problem you describe.