17-40mm question [Archive] - The-Digital-Picture.com Community

Anthony

01-01-2009, 08:49 PM

I was wondering if anyone here has used the 17-40 Lfor macro workwith a 25mmextension tube. What are your thoughts? How does image quality compare to the 100mm f/2.8 macro? I imagine it would have some distortion and be very difficult to have a blurred background, etc. Thanks!

Daniel Derkacs

01-01-2009, 11:21 PM

This will take time to load - keep refreshing it. No tube but not too bad real close up.

http://derkacs.com/kate/KATE-6291.jpg

HiFiGuy1

01-02-2009, 01:48 AM

Bryan'sreview of the 25mm II extension tube does say that it should only be used with lenses of 50mm+. I wonder if it would work at all with a 17-40 or if it would vignette too badly.

Anthony

01-02-2009, 02:16 AM

To Daniel:

Thats a great picture, thanks.

To HiFiGuy1:

I thought of that too, but he also mentioned the magnification with the 25mm tube on the 17-40 review ("http://the-digital-picture.com/Reviews/Canon-EF-17-40mm-f-4.0-L-USM-Lens-Review.aspx) (1.02x).

Bryan Carnathan

01-02-2009, 01:09 PM

If I recall correctly, Canon recommended that the 25 not be used on lenses wider than 50mm and Canon provided the 17-40 + 25mm ET spec. That would be a good test to run some day.