Rear Gelatin Filter Questions

[mackguyver]

With a 11-24 f/4 on pre-order, I was thinking about getting some gelatin film(s) for the rear holder. If I remember, the holder on the existing lenses (14L, 8-15L, 17-40L, etc.) are all the same size. Can anyone confirm? If so, then it's probably pretty safe to assume Canon will stick with the same size. Also, does anyone know the approximate dimensions of the gelatin that fits? I thought Canon had a template in the manual or on a sheet of paper, but I can't seem to find that online - maybe it was from another manufacturer.

 

[Marsu42]

If I remember, the holder on the existing lenses (14L, 8-15L, 17-40L, etc.) are all the same size.

I only have the 17-40L, but if it helps I could find a yard stick and give you the measurement if you cannot find the sizes online.

 

[mackguyver]

Thanks, Marsu - and measurements would be nice if you happen to have a moment. I'm sure Fotodiox will eventually come out with an adapter, but I'm guessing that could be several months or more.

 

[Deleted member 91053]

I believe that you are supposed to cut them out yourself from larger sheets. For reference the guidelines on my 17-40 are 31mm square, hope this is of help.

 

[Jack Douglas]

mackguyver, please keep us posted on both the filters and the lens when it arrives. I'm sure you'll be motivated to.

Jack

 

[mackguyver]

I believe that you are supposed to cut them out yourself from larger sheets. For reference the guidelines on my 17-40 are 31mm square, hope this is of help.

John, that's correct and I wanted to make sure I ordered large enough sheets. Thanks for the measurement!

mackguyver, please keep us posted on both the filters and the lens when it arrives. I'm sure you'll be motivated to.

Jack, I will definitely do that. There are a number of gelatin type sheets out there - trying to narrow them down and decide which density or densities to try. I found some reasonably cheap C-PL sheets as well. I realize I can only orient it in two directions, but then again, my polarized sunglasses work pretty well and they are in a locked orientation... It might be worth a try. Just thinking through my options.

 

[fish_shooter]

I just now measured 31mm from tick mark to tick mark (in white on the lens rear) on the rear of my 8-15mm. My guess is that a 30mm square filter will work fine.

 

[mackguyver]

I just now measured 31mm from tick mark to tick mark (in white on the lens rear) on the rear of my 8-15mm. My guess is that a 30mm square filter will work fine.

Cool, and thanks so much for your help!

 

[fugu82]

I have cut gel filters for my Sigma 15mm from 3" Wratten squares. I avoided depositing any [non-removable] fingerprints on the gels by wearing nitrile gloves, but still managed to scratch them while using the supplied metal square as a template. Found the process to be an extreme PITA, and have wondered since why no one seems to sell them precut and packaged.

 

[Marsu42]

Thanks, Marsu - and measurements would be nice if you happen to have a moment.

He was faster than me ...

For reference the guidelines on my 17-40 are 31mm square, hope this is of help.

 

[mackguyver]

I ended up buying the Kodak Wratten 2 filter at ND 3.0. I'll report on the results...

 

[LDS]

but still managed to scratch them while using the supplied metal square as a template.

Put some kind of non-scratching paper between the template and the filter while cutting.

 

[HKFEVER]

How to focus?

Focus then take off the lens, insert the filter than put back the lens?

Where to buy?

 

[Loswr]

How to focus?

Focus then take off the lens, insert the filter than put back the lens?

Where to buy?

Use Live View.

B&H

 

[old-pr-pix]

Didn't someone on here post a template? Maybe even mackguyver? Might be worth reposting or adding a link.

Trouble is these Wratten filters are made by Kodak and sold under license by Tiffen. Anything other than real common varieties may be hard to locate. For example, B&H lists the 89 series (infrared pass, visible block) but has no stock.