The 6x6 condenser would spread the light a little more than the 35 neg would really need. It won't matter for the lens, and as el wacho says, at worst you'll get more even lighting, at the expense of slightly less light.
Correct me if I'm wrong, but I believe there are high end enlargers out there where the condensors are optimized to particular lenses. I expect, however, that this is only relevant with respect to large enlargements.
“Photography is a complex and fluid medium, and its many factors are not applied in simple sequence. Rather, the process may be likened to the art of the juggler in keeping many balls in the air at one time!”
Ansel Adams, from the introduction to The Negative - The New Ansel Adams Photography Series / Book 2
Yes, this is a problem. The condensers are focused for a certain lens distance. If the lens isn't where the condensers expect it to be then the result will be uneven illumination. So, you will be Ok only for very small enlargements or a little bigger than 1:1.
Last edited by ic-racer; 04-18-2010 at 09:02 PM. Click to view previous post history.
the condersers are "focused" by moving the enlarger lamp up/down. you should move your bulb to such height above the condenser that the image of the bulb filaments will be projected exactly to the place where your enlarging lens aperture is. so you have to move your bulb to different place every time you change the magnification (thus move the lens). bigger magnification -> bulb away from condenser.
but it is critical only using projector bulb/pin-point light source, such as a single LED (as I'm currently using in focomat 1c) - using opal bulb makes things a lot more simple (if your opal bulb is really opal and is bigger than the negative area).
inserting a frosted filter above condenser helps a lot anyway.