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Background

Despite offering a so-called Trinocular Parfocal Tube for their microscopes,
(with clones available on eBay, AO seemingly produced few dedicated photo relay lenses,
also called projection oculars or photo eyepieces.
Their 1054 ocular was described as "Field of View Eyepiece",
but 10x would be too high power for 35mm photo relay.
It was probably to be swapped in place of a regular eyepiece simply to aid FoV composition.
Meanwhile, AO did offer a 1053 35mm camera back with 1057 lens and trinocular assembly:

That lens and assembly is adapted here to an M42 focus confirm adapter for Canon EOS bodies,
via T2 to M42 adapter:

AO 1053 35mm camera back flange with 1057 adapter

AO camera flange registers inside M42 camera adapter ring.
... fitting concentrically:

as an alternative to some clone or improvised photo tube and non-AO photo eyepiece.
JB Weld secures the T2 adapter to the AO camera flange.

The shutter is easily removed from AO's 1057 (or similar) Shutter, Cable and Lens Assembly.
Holes left in that assembly by shutter removal were covered by pressure sensitive aluminum tape.
Despite specifying 2.8X and 5X magnification factors, the lever so labeled is for focus, not zoom,
with magnification determined by spacing from that lens to the camera sensor.
With no extension tubes, objective field more than fills an APS-C sensor:


Even with a full 35mm sensor and no extra extension tubes,
images from the PhotoStar lens are substantially cropped from views with 20mm oculars.
DSLR flange-to-sensor spacing and a relatively thick T2-to-M42 adapter share some blame;
a mirrorless 35mm body with thin flange-to-M42 adapter would reduce cropping.
My restomod's camera image is not perfectly centered, but I judge image sharpness,
as viewed on a 60-inch TV from Canon 6D HDMI, fairly comparable to that from oculars.
Being able to tweak parfocality with AO's 2.8X - 5X slider helps.
maintained by blekenbleu