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Isco-Gottingen
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PostPosted: Fri Jan 18, 2008 12:07 am    Post subject: Isco-Gottingen Reply with quote
Any thoughts on the triplets that isco produced; primarily the isconar 4.5/100mm? Despite the fact that it is horribly slow, is it possible that it would make a good portrait lens as many triplets do?

Thanks
~Marc


PostPosted: Fri Jan 18, 2008 12:57 am    Post subject: Reply with quote
Yes. Triplets are easy lenses to create so I don't expect much variations from one manufacturer to another. The biggest difference being probably made by the type of coating used.

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PostPosted: Fri Jan 18, 2008 3:02 am    Post subject: Reply with quote
I only ask knowing that there are many forum members that are entranced by the pictures that the meyer trioplan makes, even more so than the zeiss triotar, thanks to an unusual ‘glow’ that each picture has. So yes, they all do have common qualities, but I simply wonder if the isconar has something distinctive about it. Though knowing that isco is not particularly well regarded, except for enlargement lenses, I didn't expect miracles. The f4.5 is strong deterrent however...

~Marc


PostPosted: Fri Jan 18, 2008 3:50 am    Post subject: Reply with quote
themoleman342 wrote:
The f4.5 is strong deterrent however...
~Marc


My Steinheil Culminar is 135/4.5 yet is has a beautiful trioplanish glow wide open Smile and very sharp stopped down.

However please consider that the glow is not constantly equal in all lenses. For instance my Trioplan's glow is not spread as that of Maxim's.
Another example, I used to have two Jupiter-9s (now I have one), one of them was glowing wide open the other wasn't.
Glowing is in fact the result of spherical aberration and I think it can slightly vary from copy to copy depending on how well the lens is assembled or the quality of glass/coating (the better samples having of course the less glow).

Anyway, is the lens is cheap, why don't you get it and find out by yourself? I think that half the pleasure of these buys is exactly to find out unknown aspects of the lenses Wink


PostPosted: Fri Jan 18, 2008 3:57 am    Post subject: Re: Isco-Gottingen Reply with quote
themoleman342 wrote:
Any thoughts on the triplets that isco produced; primarily the isconar 4.5/100mm? Despite the fact that it is horribly slow


It is 1.7 stops slower than e.g. a 2.5/105 Nikkor AIS and 1.4 stops slower than an f/2.8 lens, which difference is more or less meaningless under most circumstances. Last summer I did most of my "real" shooting with a 4.5/105 Radionar on 5D.

Veijo

PS. corrected the originally erroneous multipliers - results of trying to be too clever for my own good before 6 AM.

Last edited by vilva on Sun Jan 20, 2008 5:40 am; edited 1 time in total


PostPosted: Fri Jan 18, 2008 8:06 pm    Post subject: Reply with quote
hmmmm .... these lenses where frequently derived from folding cameras , re-mounted in convenient hardware to fit the slr'r of the sixties . the best example is the feinmess bonotar 4,5/105 which was mounted on beier beirax folding camera . steinheil 4,5 135 were found on 9x12 plate cameras ,rebranded agfa "Solinear" or "Anastigmat" on "Standard" Agfa cameras. Isco, Schacht, did the same kind of job with iscotar , isconar 105 or 135mm ... Focal lenghts 105 and 135 were never designed specially for slr's ! They came from standard focal lenghts of 6x9 and 9x12 folding plate or rollfilms cameras . Why spending time and money to design new lenses ? ....
These triplets lenses are among my preferred....I own over a dozen of ... Last received is a schacht travegar 4,5/105 M39 mount (lens head) . it covers easily 6x9 format . Strange , isnt'it ? To be cleaned ...


PostPosted: Fri Jan 18, 2008 8:24 pm    Post subject: Reply with quote
Helios wrote:
steinheil 4,5 135 were found on 9x12 plate cameras


hm.. I really believe that what I have can not have been a large format lens. Perhaps it bears the same name and specs, but I think it sohuld have been a different lens.


PostPosted: Fri Jan 18, 2008 8:48 pm    Post subject: Reply with quote
Helios wrote:
hmmmm .... these lenses where frequently derived from folding cameras , re-mounted in convenient hardware to fit the slr'r of the sixties . the best example is the feinmess bonotar 4,5/105 which was mounted on beier beirax folding camera . steinheil 4,5 135 were found on 9x12 plate cameras ,rebranded agfa "Solinear" or "Anastigmat" on "Standard" Agfa cameras. Isco, Schacht, did the same kind of job with iscotar , isconar 105 or 135mm ... Focal lenghts 105 and 135 were never designed specially for slr's ! They came from standard focal lenghts of 6x9 and 9x12 folding plate or rollfilms cameras . Why spending time and money to design new lenses ? ....
These triplets lenses are among my preferred....I own over a dozen of ... Last received is a schacht travegar 4,5/105 M39 mount (lens head) . it covers easily 6x9 format . Strange , isnt'it ? To be cleaned ...


Food for thought, there. And we're seeing exactly the same happening now with crop cams. Relatedly - in its day the 110 format cam was a brave attempt to go down yet another size and popularise it, bringing with it another set of lenses. Films of the day just weren't good enough to stand much enlarging from that size (popular affordable films, I mean) and the cameras lacked any feeling of real value for money that the 35mm SLRs had.

The only one of that type I recall wanting was the Minox that used 16mm film.


PostPosted: Sat Jan 19, 2008 12:01 pm    Post subject: Reply with quote
What I noticed about 105,135mm lenses is certainly right for the cheap ranges of lenses which were sold in the sixties for edixa, exakta, prakticas. One more : Zeiss Triotar ...No research and development costs ... Oldies such Tele-Xenar , Sonnar (!) , Tele-Quinon , Travenon are almost of specific designed formulas for 35mm cameras relevants . (Sonnar formula, Tele-tessar, etc...) Their origins are on Leica and Contax side .


PostPosted: Sat Jan 19, 2008 1:46 pm    Post subject: Re: Isco-Gottingen Reply with quote
vilva wrote:
... and 0.69 stops slower than an f/2.8 lens....

Sorry to contradict, Veijo, but it's one (1/1) stop from f2.8 to f4. Thus to f4.5 it is even a little more.

vilva wrote:
...which difference is more or less meaningless under most circumstances.

This is true anyway... Wink


PostPosted: Sun Jan 20, 2008 2:34 am    Post subject: Reply with quote
well I got it! : http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=180206181767&ssPageName=STRK:MEWN:IT&ih=008

I hope it was a ok deal. For $17, I guess one can't go to wrong. It looks to be in great condition. I hope I can get a front cap for it. It seems to be an odd one - 41mm. Maybe a 40.5mm snap on will work. Any thoughts?

Thanks for all the input everyone. The only reason that I wanted a little faster lens was because of the effect on dof. I tend to like a very very shallow dof for portraits, which will be what I use the lens for. Though it should be nice. I will be sure to put samples up as soon as my flickr account lets me upload some more (I already used my 100mb limit).

~Marc


PostPosted: Sun Jan 20, 2008 5:37 am    Post subject: Re: Isco-Gottingen Reply with quote
LucisPictor wrote:
vilva wrote:
... and 0.69 stops slower than an f/2.8 lens....

Sorry to contradict, Veijo, but it's one (1/1) stop from f2.8 to f4. Thus to f4.5 it is even a little more.

vilva wrote:
...which difference is more or less meaningless under most circumstances.

This is true anyway... Wink


Yeah, I forgot to multiply by two when playing with the logarithms - that's what you get when you try to be clever before 6 AM Sad

Thanks for pointing out,

Veijo


PostPosted: Tue Feb 02, 2010 11:51 am    Post subject: Reply with quote
themoleman342 wrote:
well I got it! : http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=180206181767&ssPageName=STRK:MEWN:IT&ih=008

I hope it was a ok deal. For $17, I guess one can't go to wrong. It looks to be in great condition. I hope I can get a front cap for it. It seems to be an odd one - 41mm. Maybe a 40.5mm snap on will work. Any thoughts?

Thanks for all the input everyone. The only reason that I wanted a little faster lens was because of the effect on dof. I tend to like a very very shallow dof for portraits, which will be what I use the lens for. Though it should be nice. I will be sure to put samples up as soon as my flickr account lets me upload some more (I already used my 100mb limit).

~Marc


Any samples for this lense ?
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