Author Topic: Projection lenses  (Read 39298 times)

Frank Fremerey

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Re: Projection lenses
« Reply #330 on: December 21, 2018, 08:48:24 »
Toby: The very extreme boke effect esp in the 7581 can sure be put to very good use in a different light. I fancy a field of spring blossom...
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Toby

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Re: Projection lenses
« Reply #331 on: December 28, 2018, 23:22:34 »
I'm looking forward to Spring :)

Roland Vink

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Re: Projection lenses
« Reply #332 on: December 31, 2018, 06:50:17 »
I have been following this thread with interest for a while, and thought it would be fun to contribute. I have a basic Leica slide projector sitting in my closet, with a Leica Colorplan 90/2.5 projector lens (which replaced the rather average Hector 85/2.8 lens). The following shots were taken along side my Tokina 90/2.5 macro, with the same focal length and max aperture I thought it would be interesting to see how they compare.

All pictures taken with my D600 from a tripod. The Colorplan was "mounted" via a set of K extension rings - the tubes simply allowed me to hold the projector lens by hand while keeping it reasonably well centered and blocking stray light. Focusing was achieved by moving the lens in and out to achieve a sharp image.

First up, the trunk of a tree aloe, covered with dead leaves which have remained attached to the tree. Tokina first, Colorplan next. The Colorplan has a slightly narrower field of field of view so the focal length may be closer to 95mm. The central sharpness is excellent, nearly as good as the Tokina, dropping off towards the edges of the frame. The Tokina is known as the "Bokina" as it has a reputation for good bokeh but I don't think it holds up at medium-far distances, the Colorplan has much smoother background rendition (none of the funky bokeh featured earlier in this thread)

Roland Vink

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Re: Projection lenses
« Reply #333 on: December 31, 2018, 07:10:52 »
Next, a closeup of a Lavatera flower, nearly at 1:2 magnification. Again, the Tokina is first, the Colorplan is reversed for this shot. The Tokina, not surprisingly, is sharper with better contrast. The Colorplan has more of a "glow", but with a reasonable central core of sharpness.

Roland Vink

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Re: Projection lenses
« Reply #334 on: December 31, 2018, 07:22:35 »
Last, a fern, first Tokina, second the Colorplan, third, Colorplan reversed:

Dr Klaus Schmitt

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Re: Projection lenses
« Reply #335 on: December 31, 2018, 16:08:11 »
 Great to see you also using projection lenses Roland! Thanks for that comparison!  :)
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John Geerts

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Re: Projection lenses
« Reply #336 on: February 12, 2019, 17:58:40 »
Hermagis 80mm Projection Lens from 1920

John Geerts

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Re: Projection lenses
« Reply #337 on: February 12, 2019, 18:00:58 »
Hermagis 80mm  (serial number 72292) with a 'brass' helicoid

Fons Baerken

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Re: Projection lenses
« Reply #338 on: February 12, 2019, 18:29:19 »
Wonderful.

Dr Klaus Schmitt

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Re: Projection lenses
« Reply #339 on: February 12, 2019, 22:56:50 »
Hermagis 80mm  (serial number 72292) with a 'brass' helicoid

Congrats John, looks nice indeed!
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John Geerts

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Re: Projection lenses
« Reply #340 on: February 13, 2019, 06:58:18 »
Thanks Fons and Klaus.

A bit low contrast and goes easily to infinity. With poor results by the way.

Dr Klaus Schmitt

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Re: Projection lenses
« Reply #341 on: February 13, 2019, 20:40:10 »
Thanks Fons and Klaus.

A bit low contrast and goes easily to infinity. With poor results by the way.

For such an old, uncoated lens now wonder really that it has low contrast ;-)

Not surprising that it is bad at infinity, it has quite a bit of glow ...
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John Geerts

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Re: Projection lenses
« Reply #342 on: February 13, 2019, 20:43:37 »
Thanks Klaus for the additional info.  Yes, a special glow ;)

This is an example.  All shot on the Nikon D850  by the way.

Dr Klaus Schmitt

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Re: Projection lenses
« Reply #343 on: February 14, 2019, 09:10:00 »
Yep, similar than mine....





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John Geerts

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Re: Projection lenses
« Reply #344 on: February 15, 2019, 10:24:11 »
That looks pretty identical.  Nice !


Judging from the serial number from Oktober 1948: 

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