Beginner Banding on a wide angle lens with filter?

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Posting this in the beginners section as I'm probably making an elementary mistake!

Friday I took delivery of a Tokina 12-24 f/4 lens and a HiTech 0.9 ND Grad filter.

Its my first proper wide angle lens. I stuck it on my D300 and took some shots without the filter and all was fine.

Headed out on to the moors to get some landscape shots using the new ND Grad and when I got home and stuck them in Photoshop I have ended up with some odd banding on the images. I was shooting with the sun behind me over my left shoulder and the banding has appeared on the right hand side of the image. I even changed filters to a CPL and still got some light banding.

Any idea what could have caused this? Is it a poor filter or simply user error (as in me not being in the right position relevant to the sun etc)?
 
I take it that the CPL was a HiTech and not a screw in?
 
Sorry the CPL was a screw in (Jessops one). I didn't use it with the ND Grad, they were used separately.
 
Aah.

I thought at first the banding may have been light reflection from behind the filter, but as the CPL is a screw in...

I'm sure someone will be along soon with an idea :)
 
banding is a common quirk when using a wide angle lens due to the amount of sky that the lens can see with a field of view upto 180% degrees on some UWA lenses.
can you post up an example.
 
Hmm.
I don't get banding on my D200 with a Samyang 8mm
 
most likely alot of it depends on quality of filter too and filter type.
plus angle of shot was taken, direction of light, f/stop probably has an effect too.. quite a few variables to take into account though a quick google search reveals that its a common problem
 
dean messenger said:
banding is a common quirk when using a wide angle lens due to the amount of sky that the lens can see with a field of view upto 180% degrees on some UWA lenses.
can you post up an example.
Click to expand...


banding is not a quirk of wide angle lens themselves. I suspect what Dean means is banding is commonly seen when using CPL's. Thats 'cause the amount of polarisation relates to the angle from the lgith source. With a wide angle lens and CPL your covering an large amount of sky and these angles change, causing the banding you see
 
This is pulled direct from the camera (yes its a poor photo but I was just playing around). I have edited the size of the file down to make an upload quicker due to a poor internet connection.

The banding is visible on the right hand side of the image in the sky. Two earlier shots taken (including one with the ND Grad) did not show this banding.This particular image was taken with the ND Grad attached. The CPL image shows the same banding although not as intense. The original image is a jpg file, again just messing about so not shooting in RAW.

It was taken at 16mm, ISO 400, f/20 (messing around with smaller f stops to get a crisp image throughout, suggested by a book I am currently referencing)
 
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boyfalldown said:
banding is not a quirk of wide angle lens themselves. I suspect what Dean means is banding is commonly seen when using CPL's. Thats 'cause the amount of polarisation relates to the angle from the lgith source. With a wide angle lens and CPL your covering an large amount of sky and these angles change, causing the banding you see
Click to expand...
Yep.
But what about the grad? I've never had that problem with one, though I have had banding on a 28mm with a polariser.
 
F20 is going beyond what is normally used nowadays.
 
i would try dropping down to around f/8. IS) 100 and do a side by side comparison of two shots ( one with the original settings you used and one with the suggested settings to see if theres a visible difference
 
kendo1 said:
Yep.
But what about the grad? I've never had that problem with one, though I have had banding on a 28mm with a polariser.
Click to expand...


dunno, thats one I've never heard of. I wondered if it was a variable ND which are effectively 2 CPLs stacked against each other which would cause the issues, but I'm a bit stumped else
 
boyfalldown said:
As a principle I'd rethink that - by f/20 you'll be losing quality to diffraction
Click to expand...

When I look at earlier images they were taken at f/14 so it makes sense that f/20 would be the issue.

I'll have a play next time Im out with the camera and see what happens using different f stops

Thanks for the info and replies folks, you've helped me a lot.
 
ali_surf said:
When I look at earlier images they were taken at f/14 so it makes sense that f/20 would be the issue.
Click to expand...

no I don't think it is. Diffraction would cause a softening of the whole photo. Not banding like that
 
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