Smallest aperture setting of 105mm lens? Greater than f/22?

12 years 9 months ago #116128 by Robert Chen
I have noticed that ever so often my camera will go to f/30's when I have my 105mm lens on it. Most time it won't go past f/22. My understanding was f/22 is the smallest aperture on lenses. So is this a bug in the lens or camera?

Nikon D300 24-70mm f2.8
70-200mm f2.8
50mm f1.4 & 50mm f1.8
105mm f2.8
2 SB800

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12 years 9 months ago #116132 by Screamin Scott
I'm assuming the 105 is a macro lens? The aperture value changes on a macro lens as you focus closer. A number of older manual focus lenses go to a marked F32 on the lens barrel, the effective aperture is always smaller as you focus closer. Here's a link to an explanation from a Nikon website

nikoneurope-en.custhelp.com/app/answers/...-and-on-the-lens-%3F

Scott Ditzel Photography

www.flickr.com/photos/screaminscott/

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12 years 9 months ago - 12 years 9 months ago #116133 by Henry Peach

Robert Chen wrote: My understanding was f/22 is the smallest aperture on lenses.


Nope. ...f/16, f/22, f/32, f/45, f/64, f/90, f/128, f/180... Focal length divided by exit pupil = f/#.
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12 years 9 months ago #116137 by Robert Chen
I didn't know this! This has proven itself to be one of those ah-ha moments. I'm going to have to play around with some photos today. Thanks guys.

Nikon D300 24-70mm f2.8
70-200mm f2.8
50mm f1.4 & 50mm f1.8
105mm f2.8
2 SB800

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