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p.1 #1 · p.1 #1 · Challenge with 7DMII and Sigma 120-300 2.8 Sport | |
and perhaps with the operator!
I recently got the 120-300, as well as the new 1.4x and 2x TCs from Sigma. I have used the lens a bit before today, including with the 1.4x TC. Today was the first day I used the lens with the 2x TC. I had quite a lot of pictures that were out of focus. some looked like they simply hadn't focused while others looked a bit back focused. I'm thinking it may have been operator error on the former but not on the latter. The objects being shot were either reasonably stationary or moderately moving (not BIF).
I did do the docking station micro adjustments for the lens, lens/1.4x and lens/2x combinations; multiple positions for all three, when I got the lens. the problem seems to be more pronounced on objects that are further away. I am thinking I may have done something wrong with the micro adjustment process.
Can anybody point me to a good document on micro adjusting this lens with the docking station or at least give some really good pointers? I have two specific questions:
1) I have read documents on micro adjusting that say your photo subject should be 50x away from the camera. So on a 300mm lens, 15000mm or 15m. With a 2x TC on, then I would need to be 30m away. Question: with the crop body, do I need to multiply the distance by 1.6 or not (so 48m minimum distance or still 30m minimum)? Would this mucker up the micro adjustments?
2) Any pointers on how to take some of the excruciating pain out off micro adjusting with the docking station. Unlike micro adjusting with the camera adjustments, it seems to me I have to assess, then connect the docking station and computer, adjust and repeat. There is a different way of doing this, right? Right?! I really hope so! This is so slow!
Thanks in advance!
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