rear filters for Sigma 12-24

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The Reid - 21 Feb 2007 15:12 GMT

I've not used filters since I went digital but apparently I can use
gelatin rear filters on the 12-24 according to the Sigma website. So
I looked at the cokin site and tried googling sigma rear filter and
havent found any info. Can someone point me in the right direction?
(I used to use grad ND, ND and a polariser).

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Mike Reid
updated Tenerife pics "http://www.fell-walker.co.uk/tenerifepics.htm"
Gran Canaria pics "http://www.fell-walker.co.uk/grancanaria.htm"

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Fred Anonymous - 21 Feb 2007 21:07 GMT

> I've not used filters since I went digital but apparently I can use
> gelatin rear filters on the 12-24 according to the Sigma website. So
> I looked at the cokin site and tried googling sigma rear filter and
> havent found any info. Can someone point me in the right direction?
> (I used to use grad ND, ND and a polariser).

Hi Mike.
I wonder if the filters are only from Sigma?

Regards, Ian.

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The Reid - 22 Feb 2007 14:05 GMT

>I wonder if the filters are only from Sigma?

I looked on their site and only found mention of the fact it took rear
gelatin filters.

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Mike Reid
updated Tenerife pics "http://www.fell-walker.co.uk/tenerifepics.htm"
Gran Canaria pics "http://www.fell-walker.co.uk/grancanaria.htm"

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Paul Friday - 21 Feb 2007 22:48 GMT

Try Lee for acetate filters.
Is the rear of the lens threaded to take small filters - like 30mm? The
answer is to buy one of the cheapest 30mm filter you can find, and cut
some acetates to fit.

Sorry - polyester, not acetate.

12-24 sounds great. How does it perform?
I've got a Pentax rectalinear 15mm for 35mm and a 30mm fisheye for the
big stuff, and I love them both.

>I've not used filters since I went digital but apparently I can use
>gelatin rear filters on the 12-24 according to the Sigma website. So
>I looked at the cokin site and tried googling sigma rear filter and
>havent found any info. Can someone point me in the right direction?
>(I used to use grad ND, ND and a polariser).

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Paul Friday

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Mark Dunn - 22 Feb 2007 09:12 GMT

You'd want to be able to rotate a polaroid, so that's a bit of a
non-starter, and positioning a grad would be difficult. Otherwise perhaps
you can just tack a bit of gel to the rearmost bit of metalwork. Even
Blu-Tack might do.

> Try Lee for acetate filters.
> Is the rear of the lens threaded to take small filters - like 30mm? The
[quoted text clipped - 12 lines]
> >havent found any info. Can someone point me in the right direction?
> >(I used to use grad ND, ND and a polariser).

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The Reid - 22 Feb 2007 14:05 GMT

>Is the rear of the lens threaded to take small filters - like 30mm?

cant see a thread

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Mike Reid
updated Tenerife pics "http://www.fell-walker.co.uk/tenerifepics.htm"
Gran Canaria pics "http://www.fell-walker.co.uk/grancanaria.htm"

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if - 23 Feb 2007 00:42 GMT

>>Is the rear of the lens threaded to take small filters - like 30mm?
>
> cant see a thread

Some lenses have a springclip on the back to hold a gel, I have a fisheye
like that. It's not obvious until you look close as it's a circular black
metal plate that lies flat against the back of the lens. You have to cut a
piece of acetate or gel to size to use it. Another possibility is a slot
that the filter material can be slid into.

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The Reid - 22 Feb 2007 14:05 GMT

>12-24 sounds great. How does it perform?

it seems fine to me, including as a true 12mm on a film camera.
Dont suppose a JPEG proves much but this was 12mm on film
"http://www.fellwalk.co.uk/waswat13.htm"

Of course its easy to get the sun on the bug eye front element!

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Mike Reid
updated Tenerife pics "http://www.fell-walker.co.uk/tenerifepics.htm"
Gran Canaria pics "http://www.fell-walker.co.uk/grancanaria.htm"

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The Reid - 23 Feb 2007 09:48 GMT

>(I used to use grad ND, ND and a polariser).

It seems to me a better answer might be a way of bodging a cokin
holder on to the front.

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Mike Reid
updated Tenerife pics "http://www.fell-walker.co.uk/tenerifepics.htm"
Gran Canaria pics "http://www.fell-walker.co.uk/grancanaria.htm"

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