Vignetting with Digital Rebel and EF-S 18-55 lens?

[The Photo Tuell]

http://www.pbase.com/image/22078393.jpg

Handheld with built-in flash, EF-S 18-55 lens at 18mm, F/3.5.

There is a UV filter on the lens, guess I should try taking it off and test if the vignetting is as noticable.

For you is the vignetting 'acceptable' or is it too annoying? I think it's a bit too strong and noticable for me in the top corners. Of course it depends on the picture content if it's really noticable, most pictures it's OK.

[tony4563]

The on board flash probably only goes as wide as 28mm. That's the reason for the vignetting. What you need is a dedicated flash which has a built in diffuser which enables the flash coverage to go as wide as 17mm. Canon and Sigma make dedicated cameras for EOS Digital cameras. I have the Sigma EF 500 DG ST. The results I find are very good at all focal lenghs from 17mm up. Nice shot! Hope you enjoy your camera.

[The Photo Tuell]

Ahh, didn't think it was flash fall-off. I have the 420EX and a diffuser, just didn't want to take the time to get it out (and was testing the built-in flash hehe). Have a shot of the same scene at 38mm and there is virtually no vignetting, nothing like this shot, so you are probably right. Thanks for the help.

[ron chappel]

The 300D flash does indeed match the 18-55 lens if i remember the specs rightly.It's not different from the 300V that i know of-just that the 18mm lens on 300D has the same angle of view as a 28mm on the film camera.That of course doesn't mean to say that it doesn't vignett slightly anyway...

It's a nice pic by the way.
What worries me about the lens is the extreme softness and mudiness it displays.I've seen lots of examples from this lens now and now realise that it's just another bad kit lens.Yes some have good points but this one doesn't seem to.

[Andy_T]

I would assume that the UV filter caused the vignetting. You should really do the test without it!

Would Canon engineers really design Zooms that vignette at their wide setting ??? ?

The test on DPreview.com certainly did not mention it, and in the barrel distortion test photos given there, it was not visible, either.

Regards,
Andy

[Butzl]

All lenses have a light falloff to the edges. At open aperture this vignetting becomes visible. It even happens with my 50/1.4 at f1.4. That's not necessarily an attribute of a bad lens. That's physics.
By the way: The vignetting cought me by surprise when I bought my Canon A1 with an FD 50/1.4 more than 20 years ago...

An exact circular vignetting cannot be caused by the flash - that creates a different shape than a circle.

A filter can very well create a vignetting at wide angle lenses. You should check your combination.

Have fun with your nice camera,
Jens