Cosmonaut X
Member
Looking for a bit of help and advice, if anyone is able.
I'm heading off to shoot a surf competition this weekend, and because I'm going to be working from the beach and not sure how far out the competitors will be I decided to rent a Sigma 150-600 Sports for the weekend. It arrived today and I've hooked it up to my D7100 to give it a bit of a run-through and... erk. Not at all happy with the quality of shots I'm getting - they're really soft, even at shutter speeds up to 1/2000s and stopped down to f8. I can't see any obvious back/front focusing, and because this is a rental it didn't come with the Sigma dock anyway so corrections can only be done in-body.
Given that I can't spot any obvious misfocusing, am I just needing to work on my long lens technique with such a long, heavy lens? I know about bracing, good breathing, maintaining appropriate shutter speeds etc. but is there anything else worth bearing in mind? I've got a monopod which will hook on to the lens collar so I can get some platform support too, but even that isn't making a huge difference, high shutter speeds or not...
EDIT:
Here's a quick sample shot. It's obviously been resized for Flickr, but apart from that and a sharpening pass it's pretty much as it came out of the camera. I had the focus set to single-point AF-C bang on the eye, albeit with shutter speed set relatively low - 1/640s - but to my eyes the focus looks like it's soft on the head but reasonable on the wing closest to me. I know DOF will be shallow on extreme focal lengths and relatively wide apertures, but this looks more like a touch of front-focus to me. Am I mistaking poor technique for camera/lens problems, or is there something worth tweaking here?
DSC_9344 by Cosmonaut X, on Flickr
I'm heading off to shoot a surf competition this weekend, and because I'm going to be working from the beach and not sure how far out the competitors will be I decided to rent a Sigma 150-600 Sports for the weekend. It arrived today and I've hooked it up to my D7100 to give it a bit of a run-through and... erk. Not at all happy with the quality of shots I'm getting - they're really soft, even at shutter speeds up to 1/2000s and stopped down to f8. I can't see any obvious back/front focusing, and because this is a rental it didn't come with the Sigma dock anyway so corrections can only be done in-body.
Given that I can't spot any obvious misfocusing, am I just needing to work on my long lens technique with such a long, heavy lens? I know about bracing, good breathing, maintaining appropriate shutter speeds etc. but is there anything else worth bearing in mind? I've got a monopod which will hook on to the lens collar so I can get some platform support too, but even that isn't making a huge difference, high shutter speeds or not...
EDIT:
Here's a quick sample shot. It's obviously been resized for Flickr, but apart from that and a sharpening pass it's pretty much as it came out of the camera. I had the focus set to single-point AF-C bang on the eye, albeit with shutter speed set relatively low - 1/640s - but to my eyes the focus looks like it's soft on the head but reasonable on the wing closest to me. I know DOF will be shallow on extreme focal lengths and relatively wide apertures, but this looks more like a touch of front-focus to me. Am I mistaking poor technique for camera/lens problems, or is there something worth tweaking here?
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