As you know I have this Busch Vademecum. I think one lens is missing as there are only 6 in the set.
on the other hand there are 4 filters. one look orange/yellow - the other dark orange/brownish..
and then two more..
see picture. Fantastic condition.
then I have another without markers name.
My Busch Vademecum is also missing one cell--the 15cm. The two clear "filters" are to adjust for chemical focus shift with UV sensitive plates. There's an explanation of how to use them in the instruction sheet.
Does any one have one where all the lenses are bayonet mount to a common barrel instead of screws? Pics by saturday of my partial set.
Do we "lesser educated" have to wait for your website before we get a full explenation on what is a casket set. :)
I understand from the pics that it is something like modular lenses you can put together as you wish to create the focallength you want but.........................?????????????
There's the Staeble Polyplast, where the rear cell is fixed and the front cell is changed through a bayonet mount - is that the one? I have a partial one of those too...
A "casket set" is a lens kit with several different lens cells which all fit in a common barrel. Since seven different focal cells can be combined in 18 different ways (7 singles, 6 doubles with minimal FL difference and 5 doubles with 2 steps difference), carrying one of these was a lot easier than carrying corresponding "fixed focal length" lenses.
A triple convertible is a lens where front and rear cell can be used alone as well as combined, giving three different focal lengths in one barrel or shutter. If you add a third lens cell and put it all in a nice little box, you would have a six-focal length casket set. The "casket" refers to the box.
For sure I will open my "treasure chest" in these days...some photos will arrive soon.
Jim I have three casket sets with bayonet mount:
Meyer Plasmat in Compur shutter.
Staeble Polyplast in Compur shutter
Rodenstock Eikonar in Compur shutter
and one partially because only the back lenses are bayonet mounted and this is a Suter without shutter.
Some others are present and one is a Meyer casket sets for stereo.
Have some patience Ole & CO. I'm a little bit lazy :-)))
So while this seem to be the ansver to uor dreams what are the tradeoffs?
Originally Posted by Ole
Well I see one in your pic in this thread.
That picture isn't fair - I have another one shot with a different rear cell of the same focal length, same front cell, which is perfectly sharp from corner to corner. Unfortunately the box I kept the negatives in leaked light (which you can see at the top of the "comatose" picture), and that negative looks really really bad. :(
The tradeoffs are:
Somewhat poorer performance since the cell spacing is fixed for the whole set,
Limited max aperture for the longer lenses,
you need a conversion table for the aperture (except the Polyplast)
Noone has made one for at least 50 years (with the exception of Ron Wisner), so it will be old and most likely uncoated.
You can make your own G-claron or Symmar casket set from modern or fairly modern lens cells. The real problem is that nobody makes long focal length cells that fit into the same shutter as the shorter lengths. Most of the cheaply available plasmat series jump into a Copal 3 shutter at 240 (plasmats) or 360 (dialytes) so it is hard to assemble a set with a decent range of focal lengths.
But, with a Copal 1 and the cells from a 150 and a 210 Symmar you can get a lot done. 150 and 240/270 mm G-claron cells give you a bit more range (but with larger gaps).