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Interesting example of a pre-serial number Hermagis stereo pair with both cup aperture inserts present.

There must a number of active 30x40cm photographers in Germany as this was not an uncommon size in reisekameras.
I have certainly sold a couple of sets (camera plus 2/3 double plate holders) in the...

There used to some images, but a system collapse some years ago did a fine job of cleaning out the photo files.
...

Just to be different and retro. I use the following:-

12x10”, 15x12”, 24x30cm, 30x40cm.

The lens is a Joseph Levy, London who existed for about a decade and eventually joined up with the Houghton/Butcher consolidation - like Zeiss-Ikon similar in Germany in 1926.

It is just a CdeV...

GDR (DDR) or somewhere else in the old Soviet influence block where there were plenty of scrap cameras from the early 20th Century and very little to buy in shops!

I am sure this brass polishing substance has many dear names around world - but this the version I know best from household use.

This is not about the evils of cleaning off character-giving patina...

You already have the lens mount (lens flange) attached to ubiquitous Thornton- Pickard curtain shutter! Diameters were pretty standard so you should be able to find a UK lens that fits.

The triple...

Steinheil has traditionally most data on the (lost?) flange.

After his co-discovery of the Aplanat/RR with Dallmeyer (1866?), Steinheil developed a lot of similar lenses which had rather thick...

The central stop - or the position of the Waterhouse slot - was never quite in the middle. The “correct” position is dependent on the comparative focal lengths of the front and rear optical groups.
...

We must remember where the OP is located - which is Southern Europe. Now there are not enormous quantities of Wollensak lenses as there are in N.America. It means that a purchase will be likely have...

I think Jim's was the 30cm focal length and Voigtlander wrote it up as being for the 16x21cm format in 1907. This is the original Heliar optical design - not the Dynar redesign. It is, however,...

Yes, that is one possibility.

Otherwise, you could make an extra lens board OR just add a wooden patch OR mount a T-P shutter OR cut a slightly larger hole for a larger diameter lens OR mount a...

Oh - another 18x24cm (walnut?) reisekamera! I have lots of these as well the bigger brothers/sisters.
The makes I suggested would be highly appropriate nationalitywise!
Wachtl was a big retailer in...

I'll send you PM with some auction ideas. I support the For Sale section here with my own items!

These are available to new members after being here for month!

Absolutely disgusting condition!!
I suggest you remove all brasswork, clean and replaced AFTER the wood has been refinished. Screws go walkabout.
The good thing about belows is that a dark cloth...

Certainly, more interesting lenses are available with that extra amount.

It depends what sources are available to you. If you are restricted to Ebay, the chances of even a reasonable price in a ...

What lab rat is saying is that it is an expensive (and sometimes a deeply frustrating!) path you are about to enter. Perhaps it is better to limit investment - even a simple lens would be a useful...

So pleased you were able to use just about all my guesses in your recent Ebay listing!!
How about 10% of the revenue?

I hope the info here will be of more permanent value for others!

Doesn't look much like an Imagon to me unless the front "lens" is a plain glass/filter?

Perhaps Rodenstock transferred the "Acquired trade name" to grace the Imagon product?

Some more information and photos.

Breker had another Joseph Levi "The European" CdeV Petzval in an auction in 2016. No bids at 240€ starting
I bid for the same lens (Without realising it) on...

Just a small addition about lens hood cup apertures! Everything eventually appears on ebay ( and perhaps our own FS section too!).
I discovered this on French ebay. It is a complete cup insert for...

I think people will be very reticent about illustrating, describing and comparing different pictorial lenses in action. We all have our own "soft lens" glossary - which may not be accepted by others!...

[QUOTE=Nodda Duma;1522530]Get or make a plater adapter insert 8x10 -> whole plate for 8x10 plate holder.[/QUOTE

Like these - which are from 1/1 plate down to 1/2 plate and 1/2 plate down to...

Yes, but there are two versions of the 1890-1930 reisekameras. There is the square bellows type (the type you had a link too) bit there is a second type with a tapered bellows which swivels around...

We do have a problem with references to on-going auction (ebay!) listings! So if this contribution is deleted, try a similar enquiry WITHOUT examples from current listing. It is obvious your intent...

Yes,you should be very concerned!

The rear lens cell contains two separate lenses, neither of which is an achromat.

Your lens is either not a Petzval or the front and rear cells have been...

I have once had success in contacting an ebay winner through contact with the seller. I don't think this is against ebay rules.
But you have to convince the seller that your approach - with a wish...

The drying out cracks used to be solved by strips of blackened paper stuck on the outside. You may find more cracks if you flex the dark slide a little - as it would be when in use. I have used black...

These mass produced German folding cameras had no separate lens boards/front standards. access to retaining rings was through the back of the camera when the ground glass panel was pulled out....

This lens is nearer a "Globe" lens than a RR version and the fixed maximum aperture looks nearer F.20 than the usual F.14.
So perhaps a 100+ degrees WA!

Later, well check this out!
...

Need lighter photos of the barrel and the exact engraving!
Liesegang never wholly commited themselves to mass production of taking lenses and eventually found their niche in projection lens design....

And now - Understanding the Kranz lens Catalogue!

For each lens type the diameter of the front lens and the rear lens are given as well as the focal length. In addition, it gives the plate sizes...

Just to confirm what has been suggested!
The rough black lens board has been removed from a scrap ICA Juvel - complete with the "smart?" shutter bayonet mounting device. Voigtlander had a similar...

......continued!

I have done a check of L.W. Kranz lenses (Including my own small APL II) and yours appears to be unique as regards the rear cell (it can be split in half), the lack of a serial...

Your RV was made for 8x5" - see post #87.
The flange size is exactly 2" a very common UK size.

I have done the "translation" of the antique measuring system on other catalogues before, so will check my notes tomorrow! Each of the independent german states (in 1861) had slightly different...

We don't do valuations here! But there are a awful lot of these around made by better known makers!

L.W.Kranz Braunschweig (Brunswick) was active just after Voigtlander moved most production from...

9.45x12" sounds like 24x30cm. The availability of cameras which take this European standard equivalent to 10x12" is greater than the corresponding numbers of 10x12". Lots were made made around 1900...

Serial number 5277 Howard Grubb fullplate aplanatic doublet to be added to post #52!

Just confirms that Howard Grubb's UK relancing was not a great succes as all found serial numbers are very...