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by: godoflinks
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Category: Guest Posts
Viewed: 213

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by: Jmichael1
Created: —
Category: Other
Viewed: 110

why isn’t glass transparency part of the exposure calculation?

The F number is a ratio calculated purely from the focal length of the lens and the size of the aperture. Any light meter talks in terms of F, Shutter, and ISO.

Different glass, or just different number of elements, is going to change the number of photons that get though the lens; we compensate for ND filters by adjusting F. What am I missing? Why aren’t t stops part of exposure calculations?

Where does this reflection come from in a long exposure shot?

Using a long (10 second) exposure I found I was getting an odd “reflection” in the picture, where the brightest object leaves a residue in the opposite part of the frame.

You can see it here: sample of the problem

I was still getting it in 4/5 second exposures as well. NB: Using Canon 550d with a 11-16mm F2.8 Tokina lens, at 16mm.

I assume it is some physical thing like an internal mirror or lens thing, but does anyone know for sure?

Do f-stop and exposure time perfectly cancel?

I am photographing a scene with white and black elements in it. Starting at the highest f-stop, I decrease the f-stop one stop and decrease the exposure time by a factor of 2, take a picture, and keep doing this for all the f-stops on the lens. My expectation is that raw counts should stay the same inside a white region or a black region since halving the exposure time compensates for decreasing the f-stop. But when I select a white region and average its pixel raw counts for each image, there is variability between the images (the standard deviation of the raw counts is ~5% of the mean). Same thing if I select and average a black region. I am not changing anything else (illumination, camera position). What could be causing this variation: noise, or something more systematic?

How can I think logically about getting correct exposure with flash?

I recently got a new off-camera flash (Nikon SB-700), and I’m having trouble thinking about the variables that go into proper exposure.

For example, without flash, I have a little mental decision tree that went something like this:

  • If shooting very long exposure then use manual mode with camera on tripod. Choose aperture to suit desired DOF and/or choose shutter speed to suit desired exposure time. Try to use ISO 640 or lower. Do not use exposure compensation (because in manual mode it’s pointless).
  • Else if shooting fast moving subject, use shutter priority and ISO auto. Tweak exposure compensation to prevent blown highlights or blocked out shadows.
  • Else use aperture priority, and choose suitable DOF. Make sure that shutter speed is no slower than 1 / focal length. Compensate for slow shutter speeds by 1) Raising the ISO, or 2) Using a tripod, or 3) Bracing the camera or yourself against something. Tweak exposure compensation to prevent blown highlights or blocked out shadows.

For an amateur like me, the above algorithm covers just about everything I do. I could probably even make a flowchart out of it.

Now that I am trying to learn about flash photography, things are suddenly very, very complex, and I feel lost.

My question is: Is there a similar mental flowchart or algorithm that can I use as a guide for flash?