Originally Posted by
Pere Casals
A projection lens has a particular optimization in the design.
Ideally, a projector illumination has a condenser, this means that ideally only a particular ray goes from an spot on the slide to the projected spot (say subject), so in theory optimization is made for that ray to provide image quality. Instead a taking lens has many different rays going from a particular spot in the subject to the film, so the lens needs an optimization that's valid for all those rays.
This means that, optically speaking, the projection lens may not be a top performer option for image taking, still the projection lens may deliver many creative effects that can be very nice, but IMO it is not to perform like a Xenotar made for cameras.
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