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<blockquote data-quote="gustafson" data-source="post: 503390" data-attributes="member: 40735">Thanks for sharing pics of your lens. Yours is a newer version which I believe is the Gauss design rather than the Sonnar (going by the large rear element). So I took a number of test pics last night and am increasingly certain that my blurry images are due to manual focusing errors at close range due to the wafer thin depth of field at those distances at higher apertures, compounded by the limitations of the stock focusing screen. I'm planning to order a split focusing screen to better nail focus, and will have to remember to brace myself against something while shooting so I don't inadvertently lean&nbsp; toward or away from the focus plane before hitting the shutter. Thank you for all your help and insights. As regards the rotation of the focus collar during a shot, I think it was more my imagination. I took a few shots while observing the focus collar and it is rock steady. However, my hand is picking up the vibration of the shutter release or the automatic aperture mechanism, and on occasion, this feels as if there is micro-movement of the focus collar, but it is unlikely the cause of the focus issue. Sent from my iPhone using Tapatalk</blockquote>

[QUOTE="gustafson, post: 503390, member: 40735"] Thanks for sharing pics of your lens. Yours is a newer version which I believe is the Gauss design rather than the Sonnar (going by the large rear element). So I took a number of test pics last night and am increasingly certain that my blurry images are due to manual focusing errors at close range due to the wafer thin depth of field at those distances at higher apertures, compounded by the limitations of the stock focusing screen. I'm planning to order a split focusing screen to better nail focus, and will have to remember to brace myself against something while shooting so I don't inadvertently lean toward or away from the focus plane before hitting the shutter. Thank you for all your help and insights. As regards the rotation of the focus collar during a shot, I think it was more my imagination. I took a few shots while observing the focus collar and it is rock steady. However, my hand is picking up the vibration of the shutter release or the automatic aperture mechanism, and on occasion, this feels as if there is micro-movement of the focus collar, but it is unlikely the cause of the focus issue. Sent from my iPhone using Tapatalk [/QUOTE]

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