Sigma 12-24mm. Help required.

[duhduh83]

Hi,

I've got a 12-24 Sigma lens on a 5D.

Has anyone with similar setup managed to get filters on in the 12-17mm range?

Im intending to put on graduated filters / polarizer, but it seems for 12-17mm the cokin P filter will not fit as it is too wide. I have tried it myself by handhold method.

Furthermore, if I were to use the 82mm adapter via the lens cap adapter, there is a prominent black ring in the picture at 12-17mm.

I've found two links online.

The first demonstrates how to modify the lens cap adapter to fit a cokin polarizer.
http://www.dslr.co.uk/filters_on_sigma_12-24/index.htm
Another link shows how to fit a cokin X-pro filter
http://www.dslr.co.uk/x-pro_filter_on_12-24/index.htm

Im not quite adventurous enough to really try that, so just wonder if anyone has been able to mount a filter as described in the link or via any other methods? Please feel free to share.

Thanks

[neubdetat]

if you've tried taking photos with the lens cap holder on. You will realise that on a full frame, you'll have major vignetting up to around 20mm. Best is not to use any filter at all.

[calebk]

Originally Posted by neubdetat if you've tried taking photos with the lens cap holder on. You will realise that on a full frame, you'll have major vignetting up to around 20mm. Best is not to use any filter at all.

He's talking about using an external square filter holder, not screw mount filters.

[2evans]

What about the Cokin X-Pro series? http://www.cokin.com/ico15/ico15-haut.html?=#x

”X-PRO Series” : Specially designed for medium and large format cameras as well as wide-angle lenses. Recommended for focal lenghts from 15mm onwards (35mm format). This Series is also well adapted to prosumer and professional video cameras. For lenses up to 118mm filters are 130mm wide"

[KangS]

At 12mm, there are no directly adaptable filters for the lens that can be used. I've searched.
Even Cokin's biggest X-pro range can only be used in landscape format, for which, rules out the graduated filters, which are portrait oriented.

The smallest, screw mount filter (assuming you can find a suitable adapter) is 138mm.

For square filters to work, you need to look at the cinema/film filters. those in the 5.65" square or at least 5.65"x4" square. And they cost $200 and up each at least. The graduated density ones are typically US$200 and up.

Hope its of hope.

[calebk]

AFAIK, there are cinematic filters that mount via a matte box, similar to how a square filter system is mounted. If you can find a mounting system for 35mm motion picture format, you may have some luck there. However, cinematic systems are rarely ever cheap, like what KangS said.

[Dream Merchant]

2 blobs of blu-tac works wonders.

[KangS]

Originally Posted by Dream Merchant 2 blobs of blu-tac works wonders.

Well, the only problem is that you can't really walk around with 2 blobs of blue-tack holding your precious and expensive filters in place...

It will have to be just a 1 off use and keep affair.