Bignerd wrote in post #18461884
I have been running some experiments to deal with a lack of sharpness in my pictures. The issue at hand is working with a tamron 150-600mm which up until now has been very sharp. I have upgraded my mount to an aftermarket gimbal mount (sevenoaks gimbal). My first thought was that I was not getting good stability from the mount. I ran an experiment with the gimbal taking pictures of a power line in my back yard. I tried all combinations of iso, f stop (and shutter speed), and found the lens and gimbal to be tack sharp, down to a very low shutter speed.
I have reached the conclusion that when photographing birds in AI Servo mode, with multiple frames (very different from the power lines), the lens is slow to focus, and between shots there is enough misfocus to reduce the image quality. The other possibility is in AI servo mode, multiple frames, with my hand on the gimbal mount, I am introducing shake and reducing image quality.
I took these pictures at Baylands Park in Palo Alto. This is a marsh area, filled with water birds. There is also a small plane airport adjacent to the park that allowed me to work on panning with the planes coming in for landing. These pictures were all taken in single frame mode, some in AI servo, and some in single shot mode. My question is, has anybody else had this sort of challenge in achieving image quality?
A 150=600mm lens on a gimbal takes some getting used to, I think. My longest lens is the 400/5.6, but I sometimes take the 300/4 and make it a 600mm with the 2x extender and that is a very different lens than the 400mm. Most long lens tutorials say to put your hand on top of the lens and press your face against the camera as a way to reduce or rather absorb vibration with your body. Arthur Morris however, suggests supporting the lens from below as he considers it the better technique. Here's a link to his long lens tips: https://www.outdoorphotographer.com ...lens-tips-and-techniques/