On Apr 13, 4:55=A0pm, news*NOSP...@[EMAIL PROTECTED]
(A R)
wrote:
> I've started taking 6x6 photos. Instead of buying a new enlarger, I'm
> adapting my trustworthy MPP condenser to take 6x6 negs. This has
> involved fabricating a new lens board, fabricating a new neg holder,
> purchasing a new enlarging lens and replacing the condenser.
>
> Now, I have a pair of spherical condenser lenses but unfortunately I
> have no cell to mount them in. A single lens on its own fits snuggly in
> the enlarger head and seems (by eyeball) to give a uniform illumination
> across the easel.
>
> I know some enlargers use single apsherical lenses but what
> advantage/disadvantage do I have using a single spherical lens?
>
> Come to think of it, I'm not to sure why condenser lenses come in pairs!
>
> --
>
> I need more time!
Broadly, I think the objective of a condenser system is to (i) as you
said evenly illuminate the negative, (ii) pass as much of the light
through the negative as is practical and (iii) pass it through as
nearly colimated as possible.
With one lens, if the convex side is toward the negative, objective
(i) would likely be fulfilled. I have doubts about (ii) and (iii).
|
