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<blockquote data-quote="MoreCowbell" data-source="post: 821269" data-attributes="member: 47352">This comment:&quot;If you were at minimum focus distance with these shots, at 18mm you will have far less magnification of the subject than shooting from the same distance and using the maximum focal length of this lens, which is 55mm.&quot;is similar to the one BF posed and to which I responded above (4:31 yesterday).In further checking, I think I responded incorrectly.&nbsp; I had all along thought that the 55mm shots were hopelessly out of fucus.&nbsp; I just took another shot of the clammyweed blossom and was AMAZED at the result !!&nbsp; This pic was taken in A-priority mode at 55mm with max. F-stop (F22) and 1/800s exposure.&nbsp; The camera, being in &quot;auto ISO mode&quot;, chose 3200.&nbsp; The detail here blows me away and is such that I have never accomplished.&nbsp; The shot (with its great resolution) was possible by using the &quot;half-trigger&quot; technique.&nbsp; That was the key ...I take you point about going into the menu and selecting a hard-wired value for ISO, to keep it &quot;low&quot;.&nbsp; But can you please explain what effect the ISO value has on image quality?&nbsp; I'm unclear on that.&nbsp; Why is 3200 &quot;bad&quot;?&nbsp; (Sorry to be so thick. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite24" alt=":unsure:" title="Unsure&nbsp; &nbsp; :unsure:" loading="lazy" data-shortname=":unsure:" />)</blockquote>

[QUOTE="MoreCowbell, post: 821269, member: 47352"] This comment: "If you were at minimum focus distance with these shots, at 18mm you will have far less magnification of the subject than shooting from the same distance and using the maximum focal length of this lens, which is 55mm." is similar to the one BF posed and to which I responded above (4:31 yesterday). In further checking, I think I responded incorrectly. I had all along thought that the 55mm shots were hopelessly out of fucus. I just took another shot of the clammyweed blossom and was AMAZED at the result !! This pic was taken in A-priority mode at 55mm with max. F-stop (F22) and 1/800s exposure. The camera, being in "auto ISO mode", chose 3200. The detail here blows me away and is such that I have never accomplished. The shot (with its great resolution) was possible by using the "half-trigger" technique. That was the key ... I take you point about going into the menu and selecting a hard-wired value for ISO, to keep it "low". But can you please explain what effect the ISO value has on image quality? I'm unclear on that. Why is 3200 "bad"? (Sorry to be so thick. :unsure:) [/QUOTE]

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