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Emil Schildt
11-Jul-2011, 02:57
I have been looking at a lens for my biggest camera...

I found a Steinheil 27 Lin Aplanat that looks fine.

I wrote the seller to ask, whether the 27 meant 27" focal length, and got a "yes it is", but I am in doubt.

Anyone have a good guess? Or more knowlegde than me in this area............

a 27" would be perfect for my use...

look at the images.

thanks

eddie
11-Jul-2011, 02:59
How big is it? That will give a pretty good indication if if is 27 inch.

Emil Schildt
11-Jul-2011, 03:33
How big is it? That will give a pretty good indication if if is 27 inch.

dunno - I must write the seller again...

Steven Tribe
11-Jul-2011, 03:37
Well Steinheil invented the Aplanat (Dallmeyer was no.2) so you can't go wrong.
This has still it's original flange with indentifying numbers. I seem (will check!) to recall that the 27 refers to the iris width in mm rather than inches, though.

Emil Schildt
11-Jul-2011, 03:39
Well Steinheil invented the Aplanat (Dallmeyer was no.2) so you can't go wrong.
This has still it's original flange with indentifying numbers. I seem (will check!) to recall that the 27 refers to the iris width in mm rather than inches, though.

thanks - but 27mm iris - that's small (?)...

I wrote the seller about physical mesurements.

Steven Tribe
11-Jul-2011, 03:44
VM says Aplanat Lin 11 has a focal length of around 6".
Could this be 11cm efl? "Yours" being 27cm?

Alternatively, following the iris size and VM data:

If Lin 11 is 150mm, then Lin 27 will be around 270mm?

Emil Schildt
11-Jul-2011, 03:54
sounds right, but then again: if Lin 11 is approx 6", then Lin 27 definitively isnt 27".....

CCHarrison
11-Jul-2011, 03:57
I learned the answer to this many years ago when I came across a tiny Steinheil Aplanat of just 7 LIN...

Here is the answer according to a Steinheil catalogue:

""The openings are exceptionally stated here in lines (of Paris) [labeled LIN on the lenses], since aplanats were made and named according to these units and because these names are still used by the public."

LIN was the lines of measurement of the opening (aperture) to a lens.... An inch of Paris = 27mm and there were 12 lines in an inch, i.e. a line was 2.25mm

So, a 27 LIN lens has an aperture of 27 LIN times 2.25mm per LIN = 60.75mm take that and divide by 25.4 mm per imperial inch and that equals = 2.40 imperial inches for the max aperture.

If the lens is a max aperure of f/8 which most olde Aplanat's do, then by math, the focal lenght is about 19.2 inches in focal length.

That was easy.... :)


Dan

Steven Tribe
11-Jul-2011, 04:17
Imperial inch is 25.4mm.
If I understand you right Dan, then Emil's Lin 27 is 27 lin - which is 270 lines equivalent to 23.7".
Going back to VM's example. 11 lin is 110 lines, which, (110/12) is 9.16 parisian inches. 9.16 x 27/25.4 which is just over 9.7 inches? Which is quite a lot more than their guestimate of 6"?

CCHarrison
11-Jul-2011, 04:26
Steven, you need to follow the math above: 27 LIN max aperture translates to ~19.2 inch focal length

VM: 11 LIN x 2.25mm Paris lines = 24.75mm aperture opening. If f/8 lens, than focal length is 7.8 inches focal length.

Because the Aplanat's are generally f/8 lenses, a quick and dirty math trick is to just take the lenses LIN number and multiply it by .70 to get the rough focal length.

For example, 27 LIN x .70 = 18.9 inches....close to the actual of 19.2 inches
For example, 11 LIN x .70 = 7.7 inches....close to the actual of 7.8 inches

Best
Dan

Steven Tribe
11-Jul-2011, 04:48
Now I'm with you. I didn't notice the "aperture" in mid sentence - even though I mentioned it earlier! I can understand that Steinheil in Munich used a foreign measurement as there was no standard in Germany - all the german states had their own feet and inches until Bismarck!

If you don't get this Aplanat, Emil, I have a 20" + no-name, iris RR which you could check out. If it matches the Dallmeyer RR it will cover 12x15 landscape and 10x12 portrait.

Emil Schildt
11-Jul-2011, 05:12
Now I'm with you. I didn't notice the "aperture" in mid sentence - even though I mentioned it earlier! I can understand that Steinheil in Munich used a foreign measurement as there was no standard in Germany - all the german states had their own feet and inches until Bismarck!

If you don't get this Aplanat, Emil, I have a 20" + no-name, iris RR which you could check out. If it matches the Dallmeyer RR it will cover 12x15 landscape and 10x12 portrait.

thanks all - that was educational!! I'll pass this on to the seller...

Steven: my problem is that I need a lens big ebough to work as portrait lens on my 16x20" camera....

EDIT: Just got this answer:

front and rear lens diameter are c.6cm.
The lens is 13.5cm high.

smaller than I thought....

Emil Schildt
11-Jul-2011, 05:55
just had this reply from the seller after I linked to this thread:

"Dear Mr.Schildt,
I just had the lens in my personal hands and the point of focus is at approx. 50cm.
So you are totally right it is around 19".

Thank you for the information."

So Thank you Dan and Steven

Ole Tjugen
11-Jul-2011, 06:27
Emil, what size is your biggest camera? I have a 640mm Suter Aplanat here somewhere..

Emil Schildt
11-Jul-2011, 06:40
Emil, what size is your biggest camera? I have a 640mm Suter Aplanat here somewhere..

:eek:

40x50cm

I just checked a couple of petzvals - with the front lenses removed, they are both in the right size... have to see on the matt screen..

Ole Tjugen
11-Jul-2011, 07:28
The 640 Suter should be good for that, then. I tried it on my 30x40 when I had that, plenty of coverage for that. Most likely it was designed for 40x50, the diagonal is 640mm...

It's #3 from left here. Far right is a Ross 18x16 Symmetrical, could also be a possibility. And unlike the Suter, that one is TOO big for my 24x30cm camera...

Emil Schildt
11-Jul-2011, 10:01
The 640 Suter should be good for that, then. I tried it on my 30x40 when I had that, plenty of coverage for that. Most likely it was designed for 40x50, the diagonal is 640mm...

It's #3 from left here. Far right is a Ross 18x16 Symmetrical, could also be a possibility. And unlike the Suter, that one is TOO big for my 24x30cm camera...

wow

Pm me with prices if you want to sell... (I am only considering though..)

looks promising.

Steven Tribe
11-Jul-2011, 13:20
Dear Emil - I you think should locate and purchase film first - but perhaps you are past that stage. Oh, I forgot - you are a do it yourself emulsion guy!
I have a soft lens that will cover most of the 40x50 plate (maker says 14x17") if you get the camera "fired-up".

Emil Schildt
11-Jul-2011, 13:33
Dear Emil - I you think should locate and purchase film first - but perhaps you are past that stage. Oh, I forgot - you are a do it yourself emulsion guy!
I have a soft lens that will cover most of the 40x50 plate (maker says 14x17") if you get the camera "fired-up".

hehe - I know how expensive film is for this size - so I just simply use paper negatives.

It is up and running! waiting....

what's that lens you're talking about?

belov small thumbs of three portraits made with the 540 Hermagis on this camera..

(uploaded in the "paper negatives" thread as well...)

Steven Tribe
11-Jul-2011, 14:31
The Plasticca 600mm only covers 10x12 (according to the maker) - but the 18" Port-Land covers 14x17" (see results posted by Stephane,yesterday).
This seems a bit ilogical, as they are both meniscus types - I must check coverage, I think.

Emil Schildt
11-Jul-2011, 16:06
The Plasticca 600mm only covers 10x12 (according to the maker) - but the 18" Port-Land covers 14x17" (see results posted by Stephane,yesterday).
This seems a bit ilogical, as they are both meniscus types - I must check coverage, I think.

or I could check for you - on camera.....:rolleyes:

Steven Tribe
12-Jul-2011, 02:15
OK, but I will need the Portland again from around the middle of September.
Havn't you had enough of the Plasticca (and it's copies)?

I may have a trip to Karup Å (river) before then (sea trout), which is not too far from you?

Emil Schildt
12-Jul-2011, 03:17
OK, but I will need the Portland again from around the middle of September.
Havn't you had enough of the Plasticca (and it's copies)?

I may have a trip to Karup Å (river) before then (sea trout), which is not too far from you?

my Plasticca is a merely 280mm and my Kronarette is about 300mm - hardly big enough for the "beast".....

Karup Å - I spent lots of hours there in my childhood....

Not too far away (but I am located north of Limfjorden)... about 40km north of Aalborg - 15km south of Hjørring)...

But you should be so welcome!

Steven Tribe
12-Jul-2011, 03:35
Lens board size is?

Emil Schildt
12-Jul-2011, 03:56
Lens board size is?

will mesure - I'll get back to this

Emil Schildt
12-Jul-2011, 06:54
lens board is 20x20cm