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Low keeper rate with 105 f2.5 AI-s
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<blockquote data-quote="gustafson" data-source="post: 561809" data-attributes="member: 40735"><p>Thank you all for your helpful responses. I spent some time messing around with the 105 f/2.5 AI-s yesterday, and discovered, among other things, that my copy consistently gives me soft images wide open for objects in the portrait range (15ft or less). I noticed that sharpness and contrast improved at f/4, and peaked at f/5.6. While I need to perform more comprehensive tests using liveview and a tripod, at least I have a better handle on the sharpness issue. This lens (and its prior incarnations) have such a legendary aura about them that I probably missed these details in the reviews. For instance, I can swear I've read before that it is sharp and contrasty wide open, which is simply not true (at least for my copy). I went back and redid my research, and sure enough, found some actually useful information amidst all the hype about this lens. I'll share a couple of them for the benefit of others that run into the same issue in the future:</p><p></p><p>These are notes from David Ruether: "Performance declines at wide stops near minimum focus (both conditions together), otherwise this lens is excellent even wide open"</p><p></p><p>I found this informal review of the 105 f2.5 particularly helpful: </p><p></p><p><a href="http://whatdoineed2do.blogspot.com/2012/11/105mm-f25-ai-s-another-old-skool-classic.html" target="_blank">Random Bits from Boredom: 105mm f/2.5 AI-S: Another old skool Classic</a></p></blockquote><p></p>
[QUOTE="gustafson, post: 561809, member: 40735"] Thank you all for your helpful responses. I spent some time messing around with the 105 f/2.5 AI-s yesterday, and discovered, among other things, that my copy consistently gives me soft images wide open for objects in the portrait range (15ft or less). I noticed that sharpness and contrast improved at f/4, and peaked at f/5.6. While I need to perform more comprehensive tests using liveview and a tripod, at least I have a better handle on the sharpness issue. This lens (and its prior incarnations) have such a legendary aura about them that I probably missed these details in the reviews. For instance, I can swear I've read before that it is sharp and contrasty wide open, which is simply not true (at least for my copy). I went back and redid my research, and sure enough, found some actually useful information amidst all the hype about this lens. I'll share a couple of them for the benefit of others that run into the same issue in the future: These are notes from David Ruether: "Performance declines at wide stops near minimum focus (both conditions together), otherwise this lens is excellent even wide open" I found this informal review of the 105 f2.5 particularly helpful: [url=http://whatdoineed2do.blogspot.com/2012/11/105mm-f25-ai-s-another-old-skool-classic.html]Random Bits from Boredom: 105mm f/2.5 AI-S: Another old skool Classic[/url] [/QUOTE]
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Prime
Low keeper rate with 105 f2.5 AI-s
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