I am shooting wine product images in my new studio using 2x Godox AD200's and 1x AD600Pro, plus 2 x small strip boxes and diffusers etc using Canon 5D mkii and 100mm macro lens. I have shot 12 wines for a client and am happy with the pics but the gradients are missing all the middle information please see pic Can anyone tell me why this happens and what can I do to achieve a better histogram using my strobe lights?
There is no such thing as a "good" or "correct" histogram... the shape and placement of the histogram should reflect the subject/scene recorded. E.g. that histogram looks about right for a picture of a red wine bottle (dark bottle/label) on a white background.
This image of mine also has nearly no mid-tones in the histogram; and it shouldn't.
The most obvious answer is because everything in the scene is either very dark or very light, with not many mid-tones for your camera to capture.
Especially when using flash in a dark environment (such as many studio settings where there is little ambient light in order to allow precise control of the light from flashes), highly reflective objects will show up on the far right of the histogram, while objects not very reflective, or not reflecting the light from the flash(es) towards the camera, will stay in the dark areas of the histogram.