Optiphot photography
Released when photography meant film,
semi-automated image capture involved complex optics:
.. for a camera body:
… with prisms for finder and exposure:
… so trinocular chimneys mount projection lenses for 210mm tube length
and clamp proprietary Microflex units, which are obsoleted by digital cameras.
With (trinocular) head removed, vertical illuminator flange-to-camera
body flange distance for parfocal Canon EF DSLR is about 58mm:
Canon EF DSLR flange-to-sensor distance is 44mm
Canon’s RF camera bodies have 20mm flange-to-sensor distance.
With its chimney removed,
Nikon’s F trinocular head has about 76mm flange-to-flange distance.
(Canon) mirrorless bodies achieve parfocality
with Nikon 210mm objectives and F trinocular heads…
Otherwise, with unmodified [type T or UW trinocular heads](Trinoc/#T)
or type F with chimney, a [CF PL relay lens](CFPL2.5X) refocuses objective image planes at camera sensors. Alternatively, [generic aftermarket approx 2x photo relay lenses](relay2x) are available, requiring less separation between cameras and relay lens.
A (sprayed black) PVC reducer from 2 inch o.d. to 1.5 inch i.d.
has 42mm o.d., which precisely fits Nikon’s trinocular chimneys,
and 48mm i.d., which nicely fits a Pentax K/M to T2 adapter,
that gets epoxied in place:
SUPER-FAST epoxy cures in 5 minutes, but wants 24 hours for full strength
PVC reducer was cut short so that K/M adapter would bottom in it
T2 adapter allows clocking for desired camera orientation
Will a diaphragm between projection lens and sensor improve contrast?