Hello all, and a Happy New Year.
I recently bought a Baldix 6x6 with an Ennagon f3.5mm lens, to see if it would better the Mess-Baldix I already use with its Baltar f4.5 lens.
So far, it doesn't, and I think there may be an infinity issue. I took a couple of shots about f11 with the lens set fully to Infinity, and whilst the subjects, typically 60' to 500' away are sharp, beyond that is blurred. This certainly isn't the case when using the Mess-Baldix with the Baltar lens.
I've placed a bit of diffuse material across the back as a focusing screen on each camera, and I can't see much difference. I've only done this hand-held under a coat, though, so may need a tripod and cable-release lock to assimilate properly. A bright day would help too. I've also focused a lamp through the back of each camera with lenses at infinity and apertures wide open, and the spot focuses at the same distance.
The lenses on their respective bellows appear to extend the same distance from the film-planes and are perpendicular to them.
Is there any other reason which may give rise to this 'selective infinity' thing? I'm not convinced that the Ennagon f3.5 is better than the Baltar f4.5 if kept tighter than f8. Both cameras seem to handle subjects between 5' and 20' well enough at f11 - the aperture I use with my Sunpak 33 flashgun with ISO400 film in the camera.