Rob Trek Forum

I thought everyone knew this. But today I talked to someone who had never heard of it. Shoot jpeg plus raw when pushing the stabilization limits. Then look at the jpeg file sizes and the largest file will have the most detail and least blur. So you know which raw to process before you start. It can save a lot of time, if you do this often. Also the same thing for testing multiple lens or to see if your lens is doing all it should. Shot the same subject with the same camera and settings and highest quality jpeg. The largest file will be from the lens with the most detail. If there is a great difference in your lens and others you have, then yours has an issue. Much faster than looking at photos full sized and comparing them all. The same thing can often tell which wide angle is the sharpest across the screen if that matters to you for landscape photography. Especially among the non pro lens, variation from one to another will be more between lenses so it is nice to choose the best one.

This is also a good AF test. Set the lens long and take a shot. Then set it short and take a shot. Then try back button focus. They should all have the same size jpeg. If one is of the 3 or 4 is larger or smaller you know what to do to get the most detailed shot from your camera. If you focus the shot, then refocus again to take the same shot using the shutter to focus, it is normal for the second shot to have a larger file. Which will usually (but not all cameras) match the back button focus.