39mm filter on a 15mm heliar

[thefsb]

i have a 39mm red filter that fits the 25 and 35 skopars. but when reversed, it also sits quite nicely inside the lens shade of the 15mm heliar. a little masking tape and it's mounted. inelegant, perhaps, but cheaper than 77mm filter and holder.

 

[uhligfd]

Watch the vignetting (or not) on the film and let us know which it is, please.

 

[Bryce]

Agreed, let us know how it works out!
Especially for film (i.e. full frame).

 

[kbg32]

I was usuing a UV/IR filter this way - reversed, but had to switch it back the right way as they are coated and do not work well in the reversed position. Filter with some tape, fits nice and snug inside the built-in hood.

 

[fgb2]

I bought a CV 15mm recently that had had a 37mm B+W 486 UV/IR glued to the front of the lens inside the hood like this, and spent some time removing it.

If you hold a 39mm B+W 486 UV/IR cut filter or a 39mm Heliopan slim digital UV/IR cut filter in this position, most of the frame on an R-D1 shows a cyan cast. Plus the lens vignettes heavily on this camera to begin with.

 

[peter_n]

Wouldn't this vignette pretty badly?

 

[thefsb]

vignettes may well be a problem. it may be ok (i use the filter only for IR photography). i'll see what happens and let y'all know. will be a few weeks before i have the chance.

 

[laptoprob]

The hood has cutouts for a very good reason. You can use filters, but jump to 72mm. I have a 49 to 72mm adapter IIRC, which does the trick.
BUT, if you use a dark filter, the light travelling through the widest angle will pass through more - dark - glass and cause a hotspot in the center of the image. Not vignetting but serious fall-off. I'd say something like two stops with a pola filter.

YMMV ofcourse.