Anyone seen this in the 10-22

[astropaulo]

I have one of the 10-22 and I've noticed an issue. When shooting long exposures, 15+ seconds in the daytime I get a tunneling effect. Anyone seen this with theirs? The edges are 4 stops darker in a circular pattern.

[booggerg]

Well it's an EFS lens so it should be doing that for such a wide lens.

[RichardtheSane]

Well it's an EFS lens so it should be doing that for such a wide lens.
Why does EF-S make a difference?
Just interested.

[astropaulo]

WHy does it make a difference?

[DocFrankenstein]

Can you post a sample? Sounds like a defective lens.

[DaveG]

I have one of the 10-22 and I've noticed an issue. When shooting long exposures, 15+ seconds in the daytime I get a tunneling effect. Anyone seen this with theirs? The edges are 4 stops darker in a circular pattern.

I used my 10-22 for some long exposures the other day and didn't notice any problems at all.

[chops]

The EF-S mount has nothing to do with anything. That's just a rediculous statement.

If it's possable to post a picture or two with this "tunneling" effect, we would like to see it. Maybe someone can come up with a better, sensible answer for you then.

[RichardtheSane]

The EF-S mount has nothing to do with anything.
I'm glad I wasn't going slightly nuts by thinking that :)

[Persian-Rice]

do you mean barrel distortion or vignetting??

I'm guessing you mean distortion which is absolutely normal with any wide lens, especially a 10mm.

[PacAce]

do you mean barrel distortion or vignetting??

I'm guessing you mean distortion which is absolutely normal with any wide lens, especially a 10mm.

I think he means more of vignetting since he's talking about the edges being a couple of stops darker.

I wonder if a hood is being used and it's not the right hood for this lens.

[mr.photoguy]

Post a sample image..

That may help to get a better answer to your question.

[Persian-Rice]

I missed the darker edges part.

Then yes that is vignetting. Wide angle zooms are suspetible to it, how much really depends. If you are stacking filters, that can also be a problem. I would not be surpised if the lens produces both.

I am not sure, but thinking techincally, you will see less light fall-off on an EF then on an EF-S. So more noticable vignetting, especially on a 10-22mm zoom EF-S, should be somewhat expected.

[Cadwell]

Filters are a possibility...

[astropaulo]

Here's a sample. The filter in an ND4, 15 sec exposure. The effect is similar through the zoom range. I haven't seen this effect on my Sigma 15-30 or 8mm Peleng

[chops]

Here's a sample. The filter in an ND4, 15 sec exposure. The effect is similar through the zoom range. I haven't seen this effect on my Sigma 15-30 or 8mm Peleng
I would definately send that sucker back. No lens should be that bad.

And I will go one saying that again..... the EF-S mount has nothing to do with this matter.

[DaveG]

Here's a sample. The filter in an ND4, 15 sec exposure. The effect is similar through the zoom range. I haven't seen this effect on my Sigma 15-30 or 8mm Peleng

This could be physical vignetteing if the filter is getting in the way. Are you stacking filters? I've got a regular (not slim) UV filter on my 10-22 and it shows no sign of vignetting but it wouldn't take much more. The other - and unlikely possibility - is to ask if you are using a lens hood of some kind on this lens. Except of the the hood that's designed for the 10-22/16-35/17-40 you could easily get vignetting that way too.

[RichardtheSane]

What filter system are you using?

[astropaulo]

I'm using a B&W ND 4.o 77mm. A buddy of mine has a 10-22 also and gets the same effect. There is no lens shade and only one filter is on the lens and it is not vignetting. At shorter shutter speeds this effect doesn't show at all, it is only at 15+ sec .

[RichardtheSane]

It would be interesting to see if anyone else on the forum could try this lens with a similar lengh exposure - I was considering this lens but I like to do wide angle/long exposure shots and this is rather off putting!

[hickory]

I'm using a B&W ND 4.o 77mm. A buddy of mine has a 10-22 also and gets the same effect. There is no lens shade and only one filter is on the lens and it is not vignetting. At shorter shutter speeds this effect doesn't show at all, it is only at 15+ sec .


Just curious and not that this would have anything to do with it. But what camera are you using this on?

tom

[retro]

The EF-S mount has nothing to do with anything. That's just a "rediculous" statement.

If it's "possable" to post a picture or two with this tunneling effect, we would like to see it. Maybe someone can come up with a better, sensible answer for you then.

He was trying his best to answer. The only thing ridiculous is the spelling of this post.

[cmM]

Just curious and not that this would have anything to do with it. But what camera are you using this on?

tomIt would have everything to do with it if it's a modded lens and it's used on a camera with a larger than 1.6 sensor.

[Tom W]

I don't know what to make of that, or why it only does it with long exposures. The lens surely doesn't change with time.

Have you used this filter on any other lenses? I don't think that the Sigma 15-30 uses a 77 mm filter, and I'm almost sure that the 8 mm does not.

Try a similar timed shot without that ND filter and see what happens.

[phili1]

Before you send it back, you said you used a neutral density filter. With wide angles you will get vignetteing because of the depth of the filter. You have to use thin line filters, they are 1/2 the size of a regular one.

I had the same problem. And you can't stack them.

[astropaulo]

this lens is on the 20d

[phili1]

I posted to this yesterday and can't find it.

Your problem might be the filter. When you use a wide angle lens for digital you need to use a low profile filter and you can not stack them either. They are about twice as thin as normal ones.

Some sales people do not know this but I had the problem when I bought the 10-22 and that solved it.

[astropaulo]

I'm using a single filter so there is no stacking involved. Any suggestions on how to do a 15 sec exposure in daylight and be able to see anything but white without an ND filter?

[RichardtheSane]

errr... sorry to post the obvious, but don't do it in daylight - wait till dusk.

[phili1]

OK but are you using a low profile filter or a regulr one.

[astropaulo]

The lens isn't vignetting on the filter. This effect can be seen at different focal lengths, not just full wide.

[Tom W]

Solid vignetting from the filter's ring would produce a harder shadow, not a gradual darkening. I believe that the filter is causing this, but not in the normal sense of how one thinks of vignetting. It seems that the filter itself is appearing darker towards the corners on this lens. Why, I don't know. You need to experiment with various lenses and with/without the ND filter to see if there's a pattern.

[Jon]

Well, off-axis light fall-off is governed by the cosine^4 law; it's possible also that light for the corners of the image is going through so much longer a light path in the ND filter that the effect is that of a 6.0 (to pull a number at random) ND around the corners. When you say that you don't see this at shorter exposures, do you mean at shorter exposures with the 4.0 ND in place?

[Tom W]

Well, off-axis light fall-off is governed by the cosine^4 law; it's possible also that light for the corners of the image is going through so much longer a light path in the ND filter that the effect is that of a 6.0 (to pull a number at random) ND around the corners. When you say that you don't see this at shorter exposures, do you mean at shorter exposures with the 4.0 ND in place?
I'm leaning towards the same hypothesis WRT the filter. Light entering at a more off-axis angle would be travelling through more filter glass and thus get darkened to a greater degree. Not much of a problem at normal-long lengths, but as you go wider, it becomes more pronounced.

[phili1]

A -Well if its not the thickness of the filter.

B - And it is not because you have your hood on as well.

C - And it's not the filter.

Or maybe its because of the distortion the 10mm has at the edges,which is conflicting with the filter producing that effect.

All I can tell you is that the guy I buy my eqiptment from told me that the Canon 10-22 needed a low profile filter or it would do what is happening to you. and he said I could not put a hood on as well.

Hope you find the answer.

[timmyquest]

*raises hand* i think that pic looks pretty darn cool

[EXA1a]

At shorter shutter speeds this effect doesn't show at all, it is only at 15+ sec .
A lens can't distiguish between short and long shutterspeeds. Therefore, it can't be the fault of the lens, if your above statement is correct. I doubt, it is correct.

The reason for this effect is rather the filter itself.: A ND filter has a certain thickness. If light takes the shortest path through the filter, it gives you the indicated ND, let's say ND1. If light hits the filter's surface at a certain angle, the path through the filter becomes longer and gives an effective ND up to ~1.5. Furthermore, light hitting a surface at an acute angle becomes more reflected.
--Jens--

[astropaulo]

I was thinking the light path issue also. I guess there won't be a fix for this unless I can put the filter on the back of the lens.

[Jon]

You might try getting a gel filter and holder. If that didn't work in front of the lens, you could also cut it down for use behind the lens (but be very careful!).