Drop-in Filters for UWA

[Machaon]

I was recently looking at the drop-in filter solution used for the Canon super-telephotos, and it made me wonder why drop-ins aren't also used for the really bulbous ultra-wides that don't readily support front-fitting filters.

Is there a technical reason why drop-in filters aren't used for the bulbous ultra-wides?

Perhaps the optical stack of UWA lenses needs to be so close to the flange that it doesn't allow room for a drop-in filter?

Cheers.

 

[Loswr]

No room in the optical design. However, they generally have a slot for a gelatin filter at the back.

 

[troppobash]

I live in Australia and I cannot find any info on gelatin filters
and what types or sizes are available. Can someone please
provide info or a link? I have a Sigma 12 - 24mm EX I.

Thanks

 

[Loswr]

I live in Australia and I cannot find any info on gelatin filters
and what types or sizes are available. Can someone please
provide info or a link? I have a Sigma 12 - 24mm EX I.

I'm not sure why you would need anything other than a neutral density filter for that application. Google 'neutral density wratten gelatin filter'. Kodak makes them in various densities, you would need to cut out a small square to fit.

 

[Rahul]

The bulbous 14mm II has a gelatin slot at the rear of the lens BUT the 17mm TSE doesn't.

 

[Loswr]

The bulbous 14mm II has a gelatin slot at the rear of the lens BUT the 17mm TSE doesn't.

True. Possibly the large image circle of the TS-E lens precluded inclusion of a rear gel mount. Personally, for my TS-E 17L I use the Wonderpana filter holder that attaches to the bayonet mount for the lens cap.

 

[Rahul]

The bulbous 14mm II has a gelatin slot at the rear of the lens BUT the 17mm TSE doesn't.

True. Possibly the large image circle of the TS-E lens precluded inclusion of a rear gel mount. Personally, for my TS-E 17L I use the Wonderpana filter holder that attaches to the bayonet mount for the lens cap.

I have the Wonderpana on order. I tried the LEE adapter - fail. Half an answer is no answer at all.

 

[troppobash]

I live in Australia and I cannot find any info on gelatin filters
and what types or sizes are available. Can someone please
provide info or a link? I have a Sigma 12 - 24mm EX I.

I'm not sure why you would need anything other than a neutral density filter for that application. Google 'neutral density wratten gelatin filter'. Kodak makes them in various densities, you would need to cut out a small square to fit.

Thank you. I will try again any google to see where I can buy them

 

[privatebydesign]

I live in Australia and I cannot find any info on gelatin filters
and what types or sizes are available. Can someone please
provide info or a link? I have a Sigma 12 - 24mm EX I.

Thanks

Get one of these http://www.bhphotovideo.com/c/product/45184-REG/Rosco_950SBCNG0103_Cinegel_Swatchbook.html or if you are worried about size, thought the rear element of the Sigma is small, get this version http://www.bhphotovideo.com/c/product/45185-REG/Rosco_950SBCNG0306_Large_3x5_Cinegel_Swatchbook.html

They both have a full range of colour correction gels, ie WB, and a set of ND grades too. They are optical quality but are fragile. I used to use them occasionally with my 16-35 f2.8 MkI. I use them for flash gels all the time.

 

[Loswr]

The bulbous 14mm II has a gelatin slot at the rear of the lens BUT the 17mm TSE doesn't.

True. Possibly the large image circle of the TS-E lens precluded inclusion of a rear gel mount. Personally, for my TS-E 17L I use the Wonderpana filter holder that attaches to the bayonet mount for the lens cap.

I have the Wonderpana on order. I tried the LEE adapter - fail. Half an answer is no answer at all.

It works well...but it's BIG!

 

[troppobash]

I live in Australia and I cannot find any info on gelatin filters
and what types or sizes are available. Can someone please
provide info or a link? I have a Sigma 12 - 24mm EX I.

Thanks

Get one of these http://www.bhphotovideo.com/c/product/45184-REG/Rosco_950SBCNG0103_Cinegel_Swatchbook.html or if you are worried about size, thought the rear element of the Sigma is small, get this version http://www.bhphotovideo.com/c/product/45185-REG/Rosco_950SBCNG0306_Large_3x5_Cinegel_Swatchbook.html

They both have a full range of colour correction gels, ie WB, and a set of ND grades too. They are optical quality but are fragile. I used to use them occasionally with my 16-35 f2.8 MkI. I use them for flash gels all the time.

Wonderful I will look them up.

Thank you

 

[jeffa4444]

Main reason to avoid rear slot-in filters especially gels is focus shift. With digital unlike film you have a single point of focus if you shift that then images will be soft. We designed a lens with rear glass filters and it has to have even a clear filter in at all times otherwise it will not be sharp.