Rear gelatin filter Lenses ??

[SD_photo_dood]

Him i'm a newbie here !! I'm looking to get a wide angle lense for my 10d. i'm considering the canon 16-35L and the sigma 15-30mm. both these lenses take rear gelatin filters. can someone explain how these work, especially with polarizers, which i love using. thanks in advance !!!

[Cal Maier]

The rear gelatin filters are basically the same material that you will find in use with theatrical lighting. These are also available from suppliers like B&H Photo.

These filters are not available as polarizer filters, but you could use them with a polarizer filter if you wished.

They slip into a small holder located at the rear(mount) end of the lens, and work like the filters that you mount to the front of the lens ie. warming, contrast filters, etc.

Hope this helps,

Cal

[thomascanty]

The Canon 16-35L uses 77mm filters, not rear gelatins.

[spark]

Cal is refering to the mounting part of the lens to the camera body and not the filter.

[oldlincoln]

Maybe the important thing to note is that the sigma only has a rear filter slot. I don't think it has the option of mounting a filter on the front.
I would be interested in hearing from an owner of a 15-35 Sigma on how you use a polarizer with this lens
I am shopping these lenses too. Right now, if the build quality is about the same as the 16-35 the 17-40 may get the nod. Still thinking though.
Regards

[Cal Maier]

The 15-30 EX Sigma lens comes with an adapter ring that mounts over the built in petal style lens shade. This ring will accept 82mm screw-in type filters. Using this ring is the only way to mount filters on the front of the lens. With the 10D/D60/D30 vignetting is not much of a problem with this lens @ 15mm so you can use a screw mount filter on the front with good results. With a full frame or 1.3 frame you will have vignetting when using this adapter ring.

Cal

[Ken Fong]

I second what Cal said. I own a Sigma 15-30 and a 10D. The instructions for the Sigma say that the adapter ring (which was originally intended only to hold the lens cap) needs to be removed or vignetting will occur...however, 1.6x factor cameras can be exempt from that, so you should be able to use your polarizers without problems.

[ben_r_]

The Canon 16-35L uses 77mm filters, not rear gelatins.

Um, Im pretty sure it uses 82mm filters...

[Riff Raff]

Um, Im pretty sure it uses 82mm filters...

16-35mm f/2.8L = 77mm filters
16-35mm f/2.8L II = 82mm filters

Neither of which require the rear gelatin filters.

[photobitz]

16-35mm f/2.8L = 77mm filters
16-35mm f/2.8L II = 82mm filters

Neither of which require the rear gelatin filters.

May be the OP is referring to the 17-35mm f2.8L which did have the rear gelatin filter holder.