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<blockquote data-quote="D200freak" data-source="post: 533991" data-attributes="member: 41018">Yeah, I got it.&nbsp;&nbsp; I knew that the aperture is wide open except when actually taking a picture, at which point it snaps to the selected aperture,&nbsp; but I just hadn't thought about it when I posted.&nbsp; I realize that adding another piece of glass into any optical system is going to be a tradeoff.&nbsp;&nbsp; Some loss of contrast, sharpness, or brightness is inevitable.&nbsp;&nbsp; But there may be times when the tradeoff is affordable. When my lens arrives,&nbsp; I'll test it with the TC17 and TC20 they have on display, just to satisfy my curiosity.If it'll AF well under sunny daylight conditions,&nbsp; that is sufficient for me, because it's under those conditions that I'll be wanting to make the most use of the 200-500 and if I had even more reach I'd be glad to have it as long as the image quality is still good enough.&nbsp; &nbsp; This will be my lens for such activities as automotive racing events and airshows.&nbsp;&nbsp; Long reach and fast, reliable autofocus are of greatest importance, after image quality.</blockquote>

[QUOTE="D200freak, post: 533991, member: 41018"] Yeah, I got it. I knew that the aperture is wide open except when actually taking a picture, at which point it snaps to the selected aperture, but I just hadn't thought about it when I posted. I realize that adding another piece of glass into any optical system is going to be a tradeoff. Some loss of contrast, sharpness, or brightness is inevitable. But there may be times when the tradeoff is affordable. When my lens arrives, I'll test it with the TC17 and TC20 they have on display, just to satisfy my curiosity. If it'll AF well under sunny daylight conditions, that is sufficient for me, because it's under those conditions that I'll be wanting to make the most use of the 200-500 and if I had even more reach I'd be glad to have it as long as the image quality is still good enough. This will be my lens for such activities as automotive racing events and airshows. Long reach and fast, reliable autofocus are of greatest importance, after image quality. [/QUOTE]

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