Vignetting.....grrrrrrrrr!

[philmac2]

Hi, all
Have recently upgraded from 20D to 5D and had to purchase a couple of new lenses also. I'm noticing and, to be frank, becoming increasingly frustrated with the amount of vignetting I am getting while using both the Canon EF 17-40mm L lens and the EF 24-105mm L lens. Grrrrrrrrr
Initially I assumed it was becasue I was using the A series cokin-type square filters so upgraded to the larger Z series square filters but the problem persists. I have fitted Kood 77mm UV filters to both lenses to protect the lens.
Can anyone cast any light on this or suggest alternatives, please.
Expensive and frustrating business this photography lark!!!
In anticipation
Regards

[KeithT]

Hi, I own the 5d and use it with the 24-105L and the Sigma EX DG 50mm lenses. Vignetting on full frame is certainly an issue with ultra wide lenses like 17mm. It is a lot to expect no light fall-off at all with such a wide lens. The answer is to allow enough room in your image to crop it out. The one thing with full-frame is that the resolution will be high enough to allow you to crop without losing much detail, so a bit of edge cropping is certainly a feasible remedy. Another way is to reduce the vignetting in Post with either PTLens software which can be downloaded for less than a tenner (it used to be anyway) or deal with it in Photoshop or whatever edit programme you have.

With the 20d you were using the sweet spot of the lens and not the edges where light fall-off is most apparent. With the 5d you are using the whole area of the lens, warts and all.

[PaulMontgomery]

If you're keeping the UV filter on while attaching the cokin ones, vignetting is more likely as you're pushing the holder and its ringer further forward into the field of view. Try only using one at a time.

[philmac2]

Thanks for taking the trouble to respond fellers.
Re Keiths point and cropping, IMO this sort of defeats the object of investing in the 5D. I take on board the point though and the others you make - seems there is no quick fix.
Re Pauls point, again thanks, I'm a wee bit paranoid about damaging my lenses so always use a UV or Skylight filter but it may be worth considering when I am defiantly after that full-frame shot.
Thanks again guys - any other advice remaians welcome.

[matt wilson]

a quick read of review sites says it's common on both lenses at full aperture but reduces as you stop down a bit .

[philmac2]

Originally Posted by matt wilson

a quick read of review sites says it's common on both lenses at full aperture but reduces as you stop down a bit .

Matt, would you mind creating a link to one of these review sites please, I'd be interested to learn more.
Are you saying that they are saying (that makes sense!!!) that by using a large aperture vignetting is more likely and by using a smaller aperture and longer shutter speed less likely???
Cheers
phil

[matt wilson]

http://www.the-digital-picture.com/R...ns-Review.aspx

http://www.cameralabs.com/reviews/Ca...mL/page6.shtml

[philmac2]

Thanks, Matt.
Regards
phil