Grad Filters for Two Lens Cameras

Could someone tell me how is the possibilities of using grauduated filters on two lens cameras? I'd like to provide one myself, but I'm not sure how to solve the problem with graduated filters. Is there any filter-holders which can be placed on the top lens for adjustment, then placed on the other for capturing the photo?

 

<p>

 

In addition, can anyone give me some advices of optical quality in such cameras?

On a Rolleiflex or other camera with a bayonet mount, you use a

bayonet to xx adapter, focus with the filter on the top lens, and

then transfer it to the bottom lens. The bayonet mount ensures that

the filter is in the same relative position on the taking lens.

You are asking for the impossible. THE ABOVE ANSWER WILL NOT WORK BECAUSE THE LINE OF GRADATION CHANGES AS THE f-STOP CHANGES. wHEN A LENS IS OPEN ALL THE WAY IF YOU PLACE THE FILTER TO COVER THE TOP 30% AS YOU STOP DOWN THE LENS THIS PORTION MIGHT ONLY BE 10% BECAUSE OF THE SMALLER APETURE. tO USE A GRAD fILTER YOU MUST BE ABLE TO VIEW THE IMAGE STOPPED DOWN TO TELL EXACT PLACEMENT. oF COURSE YOU COULD SORT OF BRACKET AND HOPE YOU PLACE THE FILTER IN THE RIGHT SPOT.

I used to avoid shooting color film at all in my MF rangefinder because I assumed I couldn't use ND grads with it. After experimenting, however, I've found that by carefully estimating where the edge (between the clear and ND parts) should go and using a soft-edged grad, I can get a pretty good success rate. This works less well on scenes were grad placement is very critical, such as an ocean scene where there is a sharp horizon line.

The "fact" that the above won't work must be why Rollei used to

sell a grad filter for TLRs ;-) It works best when the filter is

somewhat farther from the lens than usual

Ian Parker's Rollie TLR User's guide has a picture of a Rollie grad filter on page 112. It fits onto a bayonet hood that can lock into place over either the viewing and taking lens.<p>

I have tried grad filters with my SLRs but never with a TLR. I have to confess that I have not been overly impressed with the results since it frequentlty reduces exposure on elements in the landscape that looks out of place (i.e.: darkened tree tops or buildings). If you wish to reduce exposure of the sky, might I suggest a polarizer? I believe that new polarizers in Rollie bayonet mount are still availible from B&H in New York.

re. Roy's issue, there is the Mamiya TLR with the 105DS lens which has apertures on both lenses.