Lens Comparison by Robin Reid

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05-AUG-2006	Robin Reid

Lens Comparison

Rancho Bernardo, CA

Lens Comparison

The Canon EF 17 – 40mm f/4 L lens is my next lens to show. On the 5D its strength and weaknesses show. The top image is 17mm. The bottom one is 40mm.

On a 5D this is a true wide angle lens which is wonderful; however if you look carefully at the top one you will see there is vignetting.

Canon EOS 5D ,Canon EF 17-40mm f/4L USM
1/500s f/14.0 at 17.0mm iso400 full exif

other sizes: small medium original auto

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shatterbug		07-Aug-2006 05:49
Good comparison! The 5D with that lens on it is "truly wide". In this shot, I quite like the effect on the sky..wouldn't change a thing. Agree with Liza, PT Lens is great, although I'm using Nikon Capture NX to make corrections now.

snootydog		07-Aug-2006 03:24
Hey robin, this is a very cool comparison. I'm wondering, you didn't mention it but I think you do know about ptlens? If not, you should download and install it. Its a true lens saver.

Bob Foisel		06-Aug-2006 18:44
It has excellent colors and sharpness. If the vignetting is bad in a shot you could get DxO pro to correct.

Breland		06-Aug-2006 14:05
Nice comparaison Robin.

laine82		06-Aug-2006 08:02
Yep, the vignetting does add interest to the sky !! Still looks good though.

Guest		06-Aug-2006 06:21
Yes, the sky in the top image is great!!

Greg Harp		06-Aug-2006 04:10
Terrific series. The top image doesn't bother me a bit--I've seen filters that specifically add that effect--and PS can remove it... Beauty, as they say, is in the eye of the beholder...

Gary Blanchette		06-Aug-2006 02:36
I bought mine for $500.00. I absolutely love it. I'm with Gary, I love the vig... It kinda gives the sky a nice effect.

Pepe Zyman		05-Aug-2006 22:11
What do you expect from a $700 Canon lens? Perfection? :^)

Coleen Perilloux Landry		05-Aug-2006 21:38
However, I do know that the word vignette can mean a short literary sketch or play. In photography it can mean to soften the edges. I love both vignettes below.

Coleen Perilloux Landry		05-Aug-2006 21:33
I know nothing of what anyone below speaketh so I shall say I am enjoying the photos very much.

Gordon W		05-Aug-2006 21:19
Actually, my understanding of vignetting has not to do with clarity, but with brightness. As stated by Kodak..."A fall-off in brightness at the edges of an image, slide, or print. Can be caused by poor lens design, using a lens hood not matched to the lens, or attaching too many filters to the front of the lens." This is usually most often in the corners.

Gayle P. Clement		05-Aug-2006 20:15
Nice illustration of the lens performance.

Robin Reid		05-Aug-2006 19:30
Kent apparently your MAC doesn't have access to a dictionary. Vignetting, in photography, any process by which there is loss in clarity towards the corners and sides of an image

Gary Winters		05-Aug-2006 19:11
Interesting. Yes, there is vignetting, but I actually like the sky better in the top image. Of course, that's easily adjustable in PS.

Guest		05-Aug-2006 18:15
The smart ass comment attributed to Kay is actually mine, in case you hadn't guessed. L&K - Kent

Guest		05-Aug-2006 18:11
OK, I give up - what is "vignetting". I want to be able to speak in these esoteric terms so I can appear smart and "with it"