eyebidder wrote:
Hello all,
New to this forum. Using a D7000, set to Manual, ISO 200, AF-A, WB Auto 6500K flor. lights. Whenever I post process I always have to lighten the photo even though the camera says exposure is correct. Anyone have any suggestions?
thank you!
Yes, I have a suggestion.... buy the book "Understanding Exposure" by Bryan Peterson.
I see three possibilities...
1. The camera's metering system "thinks" the whole world is "average gray". If dominant parts of your images are brighter than average gray (either 18% or 15% "gray", depending upon who you talk to), the camera is "fooled" into making or recommending an underexposure, resulting in too dark images. If using one of the auto exposure modes (aperture priority, shutter priority, program or manual+auto ISO), it's up to the photographer to recognize the problem and correct for it with Exposure Compensation. If using manual exposure, as you are, then it's just a matter of biasing your settings toward somewhat more exposure (same thing as Exposure Compensation, but E.C. actually only works on auto exposure modes). To get more accurate exposures, there are several things you can do: Get a "gray card" or target and measure light off that with the camera's meter. The card/target has to be positioned correctly and the measurement done carefully. Personally I use Lastolite EZ Balance targets, which are flexible and fold up smaller for easier storage (esp. compared to a standard rigid 8x10" or larger gray card). One side is pure white, the other 15 or 18% gray for exposure readings. Either side can be used to set Custom White Balances, too. I also use 5x7 inch "Warm Cards".... which include both plain white and average gray targets, too.... but a set of those also comes with special targets to set slightly warm or cool-biased images using Custom WB, as well as corrections for common fluorescent and some other lighting types.
There also are handheld incident light meters that can be used to measure the light falling onto the subject, rather than what's being reflected off it. Because of this, different subject/scene tonalities no longer influence the metering and the readings and recommended settings are far more accurate. Many incident meters also can serve as highly accurate flash meters (especially useful when working with studio strobes and setting ratios between them for main, fill and other types of lights. (Note: Bryan Peterson doesn't mention incident meters in his book.... At least not in the edition I read. Perhaps this is because his book focuses on using the camera's internal metering system and... in a sense... if you have an incident meter and know how to use it, you might not need his book! Actually I think it's beneficial to be able to meter accurately both ways, so I bought, read and studied his book... even though I also have three or four incident meters!)
You also can learn to make these adjustments pretty well "by eye". Or... one of the nicest features of digital... you can take a test shot, then check the histogram. If you don't know how to read that display, learn it! The histogram is a VERY useful tool. (Note: DO NOT trust the playback image itself to be very accurate... The screen on the back of the camera is not and can't be very accurately calibrated. it's heavily influenced by ambient light conditions... which can be almost anything).
2. You mention using fluorescent lights. If those are the more expensive, stabilized type especially for photography there should be no exposure problem caused by the lights. But if they are standard household type bulbs and fixtures, those cycle on and off at a rapid rate... 120 times per second in the U.S., 100 times per second in some other parts of the world. This causes problems with accurate exposures with many cameras. The shutter might fire at any point of the cycle, causing wildly different exposures. Due to the rapid fluctuations, the camera cannot typically time the instant of exposure even when using an auto exposure mode. This also makes for significant color shifts. There really is no general solution for this, except to buy and use the stabilized types of bulbs (might require different fixtures, too... I dunno), or to take lots and lots of extra shots because you know quite a few will be under or over-exposed. Some recent Canon cameras now have a "Flicker Free" mode, too. This is especially for fluorescent and similar lighting and works by sensing the fluctuations then timing the shutter release to match the peak of light output. It works pretty well (and there's no perceptible delay in shutter release). But I don't know if Nikon and others offer similar on any of their cameras. It's a pretty good bet that the several year old D7000 wouldn't have it, since it's only been on a few Canon DSLRs introduced the last year or two.
3. Finally, if your images look correct on-screen (and their histogram appears correct), but prints or images posted online are consistently coming out too dark, is your computer monitor calibrated? Most computer monitors are way too bright, out of the box. For photographic uses the brightness must be turned down. Otherwise you'll be fooled into adjusting your images too dark. Calibration is most easily done with a device such as the Pantone Huey, Datacolor Spyder, XRite ColorMunki or similar. This is a combination of software and hardware in the form of a sensor the "reads" brightness and color test patches off your computer screen. It not only helps you set the brightness level, it also "corrects" color imbalances. Those are another typical problem. If you print much, a calibration device and software will essentially pay for itself over time, with savings of ink and paper. Calibration has to be re-done periodically (I do it every 2 months), because computer monitors gradually change as they age. For example, when it was new I had to adjust the brightness on my monitor to around 20%. Now that it's five or six years old, I have it set around 50%. It's changed that much with use. I'm sure the color rendering has gradually shifted, too... though it's not as easy to compare with how it did previously.
Hope this helps!
EDIT: I also have that Pentax spot meter (as well as one or two others). I used them a lot when I was shooting film and using the Zone System. I'd use the 1 degree
reflective meter to determine what exposure and film processing would render different tonalities in the image the way I wanted them. It's highly precise, but be aware that it's still a reflective meter, so will be influenced by the tonality of whatever you point it at.
It so happens I also have that Sekonic 298
incident meter. It's built like a tank! Mine is about 30 years old and still highly accurate... and sometimes I really like the analog readout! Great too, because there's no battery required! HOWEVER, it is not able to measure flash, the way many other incident meters can. Flash/incident meters I've used over the years include Minolta III, Minolta V.... newer versions of which are now made and sold by Kenko. I currently use a Sekonic L358... a more modern meter with ranges that better match with modern DSLRs... it has a digital readout and can be set to as fine as 1/10 stop, and can optionally be fitted with a radio module to control and test fire studio lighting wirelessly (I know for sure with RadioPopper and Pocket Wizard receivers... maybe some others, I dunno). It's a discontinued model now.... the L308 is similar without radio module feature... and there are more expensive Sekonic models available now, with built-in (not optional or user interchangeable) radio controllers for a wider range of lights and receivers.