![]() Some lenses have this as a feature, just not as severe as your lens seems to be. It's a common issue with telephoto zooms. ![]() Probability means your lens is not great at 600mm. Just point at a stationary subject and try 500mm, 525mm, 550mm, 575mm and 600mm. If you can get results lower than 550 that's all you need to confirm.ĭon't wait for another airshow. There is no sudden hump over 550mm where you need to triple your shutter speed. You don't need any lessons, other than how to check your lens and you have mostly done that too. ![]() The one at 324mm is still not perfect but usable, my Canon 70-200 L was sharper than this 324mm from the Sigma I'm beginning to think I should have just bit the bullet and got the Canon 100-400 L which is what I wanted to getĮxample off what I'm getting, this image is at 600mm the next one is at 324mm both 100% crop Various Manfrotto, Portaflash, Battery Grips, SanDisk & Lowepro Waiting for a clear day to try and start calibration with the dock, I'm considering the SpyderLensCal target thing as I just printed a test target and it looks a bit fuzzy with my old laser printerĪpple: CS3, Aperture & iPhoto. I used a tripod for a few minutes then switched to handheld for the rest of the show, so again it could be user error. Must admit I forgot to try the IS mode mode 2 for panning but I don't know if it would be that as pics at 500mm look good to me. I was also wondering is it my camera body just not keeping up, I'm running a 5D2 and it was in AI servo but perhaps its not up to the task tracking object at 200-400 mph Really that was going to be my next question what is considered infinity in terms of distance, I guess 600 meter might be a good starting point. Was just assuming it was back or front focusing. Shots under 600 mm are sharp just like the should be. Interesting, what I seem to be seeing is the pics at 600mm they seem almost like I used a cheap lens its all a little blurry and purple edges almost like a bad soft lens. I’d be interested in hearing about your experience. I think it’s because once you’re focusing out that far, the DOF is pretty wide and you’re close to the hyperfocal distance, so small focus changes aren’t that noticeable. I’ve always found it difficult to do AFMA with long slow zooms like that (I use the Sigma 100-400, which is f/6.3 at the long end). I also like to photograph at air shows, and I usually estimate the distance at around 400-600 yards/meters. Since placing a focus target an infinite distance away isn’t really practical, the next best thing is to pick a test target that’s somewhere around the distance of the planes you are shooting.
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