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I use polystyrene "trays" (the foam type) after i consume the food contained :) They are light to use and soft for the X-ray films.
https://www.chemicalsafetyfacts.org/chemicals/polystyrene/

As i am waiting for a 1930s folding camera to arrive, with a Hermagis lens nr.242764 that i guess is from around 1935(?) just after Som Berthiot took over (though no Berthiot on the lens), i was...

The video is from his Retina Resque page. Much later he started his YouTube channel as we know it today.
https://retinarescue.com/synch-comp-expl.html

As a Retina freak i follow him maybe around...

The most simple but effective shutter tester someone can make is by removing a small solar panel from a garden lamp or something and connect it to the input of the sound card. Then use Audacity...

My little Busch from that era has 2 extremely delicate shutter leaves that i wouldnt dare to use any oil, naphtha or anything near them.
There is a great chance that you are in the same path, so my...

Bounce the light on a cd/dvd surface and see if there are present other colors than red.

I don't own a "facility", I am just a tinkerer and "collector" that works on his cameras.
I learnt this as a hobby through some errors i have to admit but most of the times these errors occured...

I've serviced more than 100 Compur shutters of all ages and some/many more others -though never a Betax.

The "naphtha flush miracle" won't destroy a shutter (except when there are shutter blades...

Just to add my 1 cent tip as i think it was never mentioned before.
For 1 negative at a time, i use stryrofoam trays with great success so far, as they are soft and lightweight.

From my little experience with HR-U i rate it at iso25 and works well with dilluted developers.
As for the yellow filter, when i use a 2x yellow filter with HR-U i give it 3 stops overexposure...

Roberto i tried this Agfa at Iso25 + caffenol C at 22C /agitation every minute for about 8-10min.
That gave me good density and mid to low contrast.

Garlic's nightmares :o
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Thank you otto!

9x12
1920s Rodenstock Eurynar / underexposed Agfa Ortho CP-G Plus X-ray film / Caffenol C

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Kodak Retina 118 / Agfa APX 100 / Caffenol C . "Scanned" with m43 Panasonic GM1 and an Industar from a 1955 Zorki camera.

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with orange filter
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Kodak Retina II (014) with the Rodenstock Heligon lens / Agfa APX 100 / Caffenol C . "Scanned" with m43 Panasonic GM1 and an Industar from a 1955 Zorki camera.

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Contax II with...

I collect and have handled many little Retinas.
So far i have only found rim set Compurs with an A preceding an 6 digit serial on the 149 model (1939-40).
Range of serials between A058370 to...

I made something like this and works perfect at least up to 1/1000
http://www.willegal.net/photo/repair/shuttertester.htm

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Or just use directly a solar panel from a garden light...

Playing with a small magnifying glass.
9x12 Fuji x-ray Caffenol-C, something like 105mm/f3.75

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1/6th plate. Lovely young ladies from the early 1850s

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I never realy tested this coated pre war Sonnar that came with a really well used but excellent working (i changed the ribbons) Contax with some history.

A quick shot on m43 at f2
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and...

An unexpected strange behavior of Fuji HR-U when developed with intermittent agitation, but i find it interesting...
9x12, Rodenstock Eurynar, yellow filter 2x (3 stops overexposure), Caffenol-C.
...

Yes Jim, i think it is interesting, but i have to find some extra film holders, so i could shoot more than one set of 3 at a time...:)

Color from x-ray film? :o

Fuji HR-U expired since 2009, "iso" 25, Caffenol-C, and my trusty 1920 Bellieni 9x12 camera.
3 combined BW pictures with blue (x2), green (x2) and yellow (x2) filter....

+1

Also, from what i have seen (maybe more than 50 compur shutters from the 30s) 80 years from now sounds like the ablosute minimun :o:)

Robot II /FP4Plus/ Caffenol C.
Hmmmm, i prefer my Photavit :rolleyes:
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Hi Jimi,
yes, too many of them for me too and the square format feels a bit akward to me.

On the other hand the little Photavit is very handy, tiny, easy to use and with good grip.
If there...

Wandering around with the tiny Photavit 24x24(mm) and Kodak Retina 119
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i also met a girl but she was not very exited with my pressence and left...
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I use baby oil on bellows and pouches. Not sure if it is a scientifically acceptable solution but i can not see any harm so far.

You may have to apply many coats until the leather is saturated....

Thanks. Shutter serial number is 213399

100% crop of previous pic with lens wide open
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And at f9.
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At f12.5 appears the same. (Closing down more, the image deteriorates and the glass air bubbles begin to appear on the...

It is strange that the rear group S/N does not match the front for just 4 digits(?)...
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On camera there is a second infinity mark to be used with only one group of the lens stoped...

So, closer inspection of the lens made me think that this is a kind of balsam deterioration in both front and rear groups. Circular spots are air bubbles in glass.
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The camera is in nice...

I will check tomorrow for more pictures. Since then i found in my hard drive one pic of the fungus that i can not recal if is in front or rear group (probably front), and a test pic with this lens on...

Oh i just found this thread.
I have somewhere an ICA "Toska 215" 9X12 with quick release Compound shutter and a “Maximar” 1:5.4 / 13.5cm lens.
If i recall well it must by dated just before WWI.
...

On stolen Markus Hofstätter's idea, but different concept :)
Retro lockdown

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Keep it up Barry!

35mm pinhole
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Thank you both. I found fun and interesting the pinhole photography.

The LF (13x18) pinhole camera was a side project along with my little 35mm pinhole, as i found some x-ray film recently.

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Plywood (13x18), flooring wood (35mm), 3d printed parts, laser...