Due to the fact that the Sigma 8-16mm lens have about the same
angle of view on a APS sized sensor as the Nikon 14-24mm has on a FF sensor 114.5deg vs 114deg, we should also be able to use the same size of filters.

As far as I know there are tree different options for filters that might be possible to adapt on the Sigma 8-16mm lens, However all of them
require some modification.

The options are: Lee Filters SW-150 Filter Holder that has been designed specifically to fit the Nikon 14-24mm lens it uses 150mm wide filters.

The Cokin X-Pro Series Filters that also have been discussed on the
"net" and rumored to be usable with the Nikon 14-24mm lens.
The X-Pro series Filter holder paired with the P499/X499 universal
adaptor ring suitable for 84-118mm barrels does fit the Nikon 98mm
diameter but will need some work to be adaptable to the Sigma 8-16mm lens that have a 73,5mm outer diameter (Find out how at the bottom of this page!).
however the Cokin X-Pro system uses 130mm wide filters compared
to the 150mm of Lee filter system, this will limits the Nikon 14-24
users in a way that they will not be able to stack filters if the lens is
used in its widest setting !

The most promising and probably most bang for the buck is the
most recent solution by 2012-02-01 is the Fotodiox Pro Filter Adapter for Nikon 14-24

Above: A proximate image of how the Fotodiox Pro filter adapter
would look if adapted to the Sigma 8-16mm lens to the right in
the image the Nikon 14-24mm lens that the filter kit is specially
designed for!

The solution that I opted for, a Cokin X-Pro filter holder + 86mm filter adapter ring.
A rubber grommet was used to cover the gap between the 86mm filter adapter ring that I had on hand and the outer lens barrel.
The inside diameter of my 86mm adapter is 83mm and the outer diameter of the lens at the location where the filter ring should be fit is 73.5mm.

I have now ordered another adapter ring with a 77mm thread that should measure 74mm inside witch should leave just enough room for some tape to protect the lens barrel from scratches when the filter adapter is fitted to the Sigma 8-16mm lens.

Above the Cokin X-Pro filter holder + Sigma 8-16mm lens on a Nikon D7000.
The filter has to be used in the outer position when lens is at the widest settings otherwise heavy lens vignetting will occur!

The filter in this test setup is a home made red/brownish color filter mad from a polycarbonate sheet just to find out if the filter holder/adapter should work with the Sigma 8-16mm lens I didn't want to buy an expensive gradient ND filter just to find out that I can't use it. However now that I know it will work I will also get the filter that I want to use with this lens :0)

The filter holder must be fitted to the lens in a way that there will only be about one millimeter space between the fixed flower shaped sun shade of the Sigma 8-16mm lens and the filter when fitted to the outer slot of the X-pro holder.

In this image you can clearly see the rubber gromet that I used to make the 86mm filter holder adapter ring to fitt the 73.5mm diameter lens barrel.

I have now ordered a 77mm lens/filter adapter ring that hopefully fill fitt better, I will update this page and report about the new 77mm ring when I get it.

I finally got the new Cokin X-pro 77mm adapter ring that I ordered.
I´m happy to say that the 77mm ring fits perfect!

The 77mm Cokin filter ring have just enough freeplay to allow me to put some tape on it to protect the Sigma 8-16mm lens from scratches.

One turn of Permacel P421 tape and 4 small tape tabs of the same tape made the ring fit with some friction to keep it steady on the lens.

This tape is a6.5 Mil (0.17mm) thick PTFE tape and it is rather expensive so look for something similar in case you can't find it at a overstock bargain price (Take a look at eBay here-> ).

With the adapter ring prepared with tape and already mounted on the Cokin X-pro filter holder now just slip it on over the front part of the lens. You need to push it almost all the way to the focus ring to avoid corner light fall off (Vignetting) just leave a few tens of a millimeter space to the filter when it is installed in the outermost slot of the filter holder.

The Cokin X-pro filter holder is huge, It makes the Sigma 8-16mm DC HSM and the Nikon D7000 to look like a pocket camera!

Above a photo of my wall at home to show corner light fall off of the Sigma 8-16mm @8mm (Without filter or filter holder on the lens).

Corner vignetting on the Sigma 8-16mm with the Cokin X-pro filter holder in place, just look at the corners and try to ignore the shadows in the middle that is produced by the camera stand and my own presence!
Looks like no further light fall off have been introduced by the filter holder compared to the image #1.

Same wall same situation except for the fact that I now have put a filter in to the X-Pro holder (A home made filter AKA tinted Plexi glass).
You can clearly se the dark corners but it isn't any worse than in pic #1 above.
The falloff is just a ultra wide lens trademark and doesn't get worse with the Cokin X-Pro filter kit in place!

A view from my balcony Nikon D7000, Sigma 8-16mm @ 8mm No filter or filter holder on lens.

Same as image #4 but now with the Cokin X-Pro filter holder now installed on the Sigma 8-16mm lens and with the DIY color filter*.
*(A home made filter AKA tinted Plexi glass).

I will update this review/DIY as soon as I get a ND Grad to tryout!

I will add to this page when I come up with something that will be useful. in the meantime please let me know if you found a better option to this problem or just want to share your DIY project with stockholmviews.com readers.

• Using a Cokin X-Pro filter on the Sigma 12-24 lens by Chris Maddock
• Filters for lenses that can't take filters by Ben Jacobsen
• Upcoming link to the No 1 filter solution for Sigma 8-16mm lens!

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