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petrascope 1.5x


macdonaldz
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picked up this guy on ebay a few weeks ago. glass is in immaculate condition. super lightweight. no focusing helicoid - 2 separable optics and a set screw to retain them. came with a mounting bracket that i epoxied a 67-58 stepdown onto and  screwed a 52-67 step up onto it and the plastic 50 canon.

 

maintaining alignment is a pain but can create some cool mesmerizer effects. no focus marks. minimum seems to be about 4'8"

 

words from tony -

"one they did had a grove cut out so you could move the 2 optics closer together or apart.

losen the screw and push in or pull out..

you will then have to orientate the front optic so it is sharp

very fiddly but quite good glass on some of them

[...]

 they made many different sizes it was made in a fot shop in south london in the 1970s so kind of hand made nothing was standard"

 

 

 

 

pic of setup

 

f6591324b8cc11e2815722000a1fa518_7.jpg

 

2 flare tests

 

901300_10151694003868804_849709350_o.jpg

 

 

919382_10151694011518804_1064566711_o.jp

 

 

charts

 

w/o petra on canon plastic 50mm 1.8

919571_10151694024868804_593330265_o.jpg

 

w/ petra - taking lens must be focused closer - may have some kind of built in diopter as it doesn't see to like infinity that much

901311_10151694024728804_224514303_o.jpg

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