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<blockquote data-quote="Dave_W" data-source="post: 55184" data-attributes="member: 9521">I purchased a used but in excellent condition 60mm micro a few months ago and I've noticed that it does something that my other lenses do not. In either manual or aperture mode I can adjust the f to 2.8 as long as the focus subject is a fair distance away. However if I focus on a close subject the lens will automatically stop down a half of stop to 3.2 and will not open back up to 2.8. I have tried focusing on a point distant enough to allow me to access f=2.8 and then quickly turning the camera towards a close subject and it still jumps to 3.2. Does this have something to do with the actual macro lens and the focal length when focusing on a close-up subject or is there something funky going on with my lens?There is a funny little red switch just above the aperture ring that I have no clue what it does but regardless whether the switch is up or down the same f-stop distant vs. close change up occurs. Does anyone know what that funky little red switch above the aperture ring is for?</blockquote>

[QUOTE="Dave_W, post: 55184, member: 9521"] I purchased a used but in excellent condition 60mm micro a few months ago and I've noticed that it does something that my other lenses do not. In either manual or aperture mode I can adjust the f to 2.8 as long as the focus subject is a fair distance away. However if I focus on a close subject the lens will automatically stop down a half of stop to 3.2 and will not open back up to 2.8. I have tried focusing on a point distant enough to allow me to access f=2.8 and then quickly turning the camera towards a close subject and it still jumps to 3.2. Does this have something to do with the actual macro lens and the focal length when focusing on a close-up subject or is there something funky going on with my lens? There is a funny little red switch just above the aperture ring that I have no clue what it does but regardless whether the switch is up or down the same f-stop distant vs. close change up occurs. Does anyone know what that funky little red switch above the aperture ring is for? [/QUOTE]

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