I have also tried this effect, but I use a glass-carrier for medium-format and having adjustable film guides to hold 35mm film in the centre of the field. The carrier also has built-in masking devices on all four sides. Does the Omega have no masking arms? I appreciate Meopta and De Vere even more these days!
If you can replace the top part of the neg-carrier with a piece of thin polycarbonate (sold as secondary glazing, by the square metre/foot) it would help enormously to keep the film flatter, as the curve is usually "up" in the centre of the strip. Masking could then be black paper taped to the top of the plastic. If you are doing this as an infrequent thing, then there is no point seeking out thin and difficult to work with optical glass to make the carrier - and I won't mention the non-Carl Zeiss abilities of the Holga lens
Last edited by MartinP; 03-23-2013 at 11:24 AM. Click to view previous post history.