Barrelling! How to avoid it??

Started Feb 4, 2011 | Discussions
accony Forum Member • Posts: 95
Barrelling! How to avoid it??

I've been asked to take a few shots for a friend of some mosaic tiles, but my attempts so far have all provided a nice range of barrelling. Any ideas on avoiding this at source and not through PS? It's the head on shots that are the problem.

Using a D90 + 16-50 2.8 Tokina. My only other lens is a Sigma 70-200 would this be better
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Colin

Hear2see Veteran Member • Posts: 9,190
Re: Barrelling! How to avoid it??

if you use your Tokina at about 35mm you will be OK.

Art Jacks Senior Member • Posts: 2,867
Re: Barrelling! How to avoid it??

If you used a longer focal length and shot from further away your problem would be solved but it may also allow you to make some adjustments to your lighting to get rid of the reflections.
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OP accony Forum Member • Posts: 95
Re: Barrelling! How to avoid it??

Thanks for the quick replies, I'll give it a try.
The lighting was just experimental so that will probably be the next question!!
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Colin

ClaySTurner Regular Member • Posts: 161
Re: Barrelling! How to avoid it??

To add to what others have said, zoom lenses often have barrel distortion at their wide end and pincushion distortion at their long end. I don't know about your particular lens, but try it at several different focal lengths and you may find one focal length where the distortion is minimal. Of course you can try other lenses if you have some.

Clay

nkarasev Senior Member • Posts: 1,499
Re: Barrelling! How to avoid it??

accony wrote:

I've been asked to take a few shots for a friend of some mosaic tiles, but my attempts so far have all provided a nice range of barrelling. Any ideas on avoiding this at source and not through PS? It's the head on shots that are the problem.

Using a D90 + 16-50 2.8 Tokina. My only other lens is a Sigma 70-200 would this be better
--
Colin

To add to what was said already - you also need to position your camera carefully and to level it with precision so that the picture is straight (if not barrel, there will be perspective distortion which you also do not want to correct in post)
I assume you have used a tripod. If not - do you need reasoning for that?

viking79
viking79 Forum Pro • Posts: 14,148
Re: Barrelling! How to avoid it??

nkarasev wrote:

To add to what was said already - you also need to position your camera carefully and to level it with precision so that the picture is straight (if not barrel, there will be perspective distortion which you also do not want to correct in post)

Agreed, perspective distortion will look like "keystone" if you have ever used a projector. If the projector isn't perfectly aligned with the wall the image will be narrower along one edge and it will look like a trapezoid (newer projectors correct for this automatically).

Eric

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NNL33543 Forum Member • Posts: 80
Re: Barrelling! How to avoid it??
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You can correct this in photoshop or many other programs.

Tony
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GreatWhiteNorthEh
GreatWhiteNorthEh Forum Member • Posts: 63
Re: Barrelling! How to avoid it??

DXO Optics has support for the D90/sigma 70-200 combo

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sportyaccordy Forum Pro • Posts: 11,863
Re: Barrelling! How to avoid it??

Only use Nikkor lenses

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ianz28 Veteran Member • Posts: 5,382
Re: Barrelling! How to avoid it??

sportyaccordy wrote:

Only use Nikkor lenses

that solves nothing in regards to barrel or pincushion distortion. In fact some Nikon lenses exhibit the more complex mustache distortion which is even more difficult to correct in post processing.

To the OP. Distortion can often be exacerbated further when close focussing due to field curvature.

My suggestion would be to use the 70-200 around the 110-130mm range. If that lens exhibits any field curvature try shooting from a slightly greater distance. You can always crop the image slightly if you are needing to fill the frame.

The other option would be to borrow or rent a macro lens. Most macro lenses have a flat field of view and little to no distortion as this type of work is what they are designed for.

Ian

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bgD300 Veteran Member • Posts: 4,552
Re: Barrelling! How to avoid it??

The sample picture already shows keystoning. Being plumb and centered on the subject is important. A tripod is very useful here.
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OP accony Forum Member • Posts: 95
Re: Barrelling! How to avoid it??

Once again thanks to all for taking the time to answer my question.

The sample picture was hand held and not constructed with a huge amount of thought or accuracy.

I'll make sure a tripod is used next time with some precise measurements and also try some of the settings suggested.

As for Nikon lens, there's always one isn't there!! Like many others I have what I can afford, if you are in a position to buy better[?] lenses good luck to you. The D90 is my first DSLR and replaces my Praktica MTL3.

Hopefully I might get some recompense for this little job and then perhaps a Nikkor of some sort might come my way?
Thanks again.
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Colin

raymondox Veteran Member • Posts: 3,680
Re: Barrelling! How to avoid it??

I use ptlens
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Ilkka Nissilä Veteran Member • Posts: 4,107
Re: Barrelling! How to avoid it??

A 50/1.8 is a lens with very low distortion and it's cheap. If there is space to use it then that would be a good choice.

fraserj1 Senior Member • Posts: 2,565
Re: Barrelling! How to avoid it??

accony wrote:

I've been asked to take a few shots for a friend of some mosaic tiles, but my attempts so far have all provided a nice range of barrelling. Any ideas on avoiding this at source and not through PS? It's the head on shots that are the problem.

The simple solution, as others have stated is to use a lens that shows low distortion characteristics.

You can find distortion samples and information at http://www.photozone.de for many Nikon and non-Nikon lenses. Find your lenses in the list on this site, and maybe you will be able to find the best lens to use in your kit for what you need to do, or at least figure out what the best focal length would be for your zooms.

I would suggest that primes in the 50 to 105mm range would be good lenses to use if you have the room. The 60mm micro would be ideal.

Also, you might consider lighting the tiles properly so that you don't get light reflections directly into the lens, and maybe use a polarizer.

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sportyaccordy Forum Pro • Posts: 11,863
Re: Barrelling! How to avoid it??

ianz28 wrote:

sportyaccordy wrote:

Only use Nikkor lenses

that solves nothing in regards to barrel or pincushion distortion. In fact some Nikon lenses exhibit the more complex mustache distortion which is even more difficult to correct in post processing.

To the OP. Distortion can often be exacerbated further when close focussing due to field curvature.

My suggestion would be to use the 70-200 around the 110-130mm range. If that lens exhibits any field curvature try shooting from a slightly greater distance. You can always crop the image slightly if you are needing to fill the frame.

The other option would be to borrow or rent a macro lens. Most macro lenses have a flat field of view and little to no distortion as this type of work is what they are designed for.

Ian

Sarcasm my friend, it eludes you.

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ianz28 Veteran Member • Posts: 5,382
Re: Barrelling! How to avoid it??

sportyaccordy wrote:

Sarcasm my friend, it eludes you.

Sarcasm requires wit which you obviously don't possess. Next time try humor...it might be more suitable for you.

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