Kindermann thermoscope

superflash · Apr 26, 2020

Hi everyone, I have 2 questions to ask you, related to this projection accessory:

https://www.picclickimg.com/00/s/MT...m-thermisches-und-optisches-Prufgerat-_57.jpg

1) Do any of you have the manual or do you know where and how can I find it?
2) Can any of you give me some indications for use?

Thank you.

Donald Qualls · Apr 26, 2020

I'm going to guess that the chrome frame is the same size and thickness as a slide mount, and you'd use this by loading it into your chosen slide projector and read the temperature off the screen -- to know how well your projector is protecting your chromes. Probably of more use in large, high-powered projectors intended for movie theater size screens than with the small ones that used to be sold for home use.

superflash · Apr 27, 2020

Thank you Donald Qualls.
Yes. I don't own any manual, so I would know, how can I use it.

AgX · Apr 27, 2020

For checking the temperature one would not need that circular scale.
I think the scale was intended as aberration test-target for testing the projector lens.

Concerning the temperature: how would that 2-temperature scale work ? I am clueless, unless there were 2 meters and thus 2 pointers.
Is there 1 pointer and its shadow or are there 2 pointers?

superflash · Apr 27, 2020

AgX:

there is only one pointer (black on the left, in the pic) and it indicates a single value on a double scale, that value is expressed both in celsius (below) and in farenheit (above).
But how should I use the letters A, B and C and the numbers 1 to 10 that are in the right side and lower left corner?

Donald Qualls · Apr 27, 2020

Again, an educated guess, but the overall grid is probably for evaluating geometric distortion (pincushion and barrel distortion, fairly common in projection lenses) and/or for aligning a tilting slide carrier to remove keystone on the screen when the projector has to be angled up or down. The scales and opposite corners likely see use both for evaluating corner sharpness and for quantifying the level of pincushion or barrel in the projection -- in some lenses, these can be adjusted by varying element spacing, as I recall.

A, B, and C zones define how far from the corner you're measuring, and the numbers on the rays are probably used (along with a protractor at the screen?) to specify the actual amount of distortion present.

Edit: if you're curious enough, here's one in original box with manual, and thermometer function checked.

AgX · Apr 28, 2020

superflash said:
that value is expressed both in celsius (below) and in farenheit (above).

Thank you! I am an idiot. Read both as °C. Being able to read letters seems benefitial in such thread...

superflash · May 4, 2020

Donald Qualls:
Thank you very much for your tips.

AgX · Jun 10, 2020

In my paper archive I found some more infotmation.
The thing is from 1966 or earlier. That was a time when Kindermann was nearly only busy with photolab stuff and only had 1 projector in production, in contrast to later times.

Kindermann described that thing as:
"Thermical-optical testing device for miniature-format projectors 5x5cm, for measuring slide-temperature, as testing device for slight optical testing, for measuring illumination-density and -spread, testing for sharpness, especially apt for super-slides (4x4cm)."

Kindermann thermoscope

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