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Message: <blockquote data-quote="hark" data-source="post: 196576" data-attributes="member: 13196">nzswift and Rick, thank you for your input. Both of you have given me valuable information! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />nzswift, wish I still had some of the files on my card, but I reformatted it long ago. Would be interesting to see which focus spot I used.Rick, really good to know about not using the center focus spot (which tends to be what I've been choosing). I don't have this issue with my D90 though. However, I will try to select a different spot to use in the future. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" />As for the oil spots, I will take a few photos at either f/16 or f/22. I already know they will show up there, too, because I took a landscape photo using f/16, and those little buggers were there. Grrr... I haven't yet uploaded my images to Nikon so I can retake a sky shot at f/16 for Nikon.This afternoon I took a few test images using my Sigma 70-200mm f/2.8 wide open at 200mm at the minimum focusing distance. I couldn't replicate the problem, but it isn't the lens I carry with me outside. Now I'm wondering if it is a lens issue with my Nikon 70-300mm f/4.5-5.6--not sure if I've used it on my D90 lately, but perhaps I will give it a try. I have a couple files to submit to Nikon, but since I tend to focus and recompose, I'm not sure that identifing the focus point will yield any help, will it? If the camera refocused on something else when I recomposed, how would Nikon know?</blockquote>

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