Archived posting to the Leica Users Group, 2005/01/26

[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]

Subject: [Leica] adhesives
From: jbcollier at (John Collier)
Date: Wed Jan 26 05:38:41 2005
References: <> <> <> <> <>

I agree that the same level of precision was possible but I know from 
experience that it is now more consistently realized. I have not had to 
return a single modern lens due to suspect optical performance. With 
older lenses there can be significant variation from lens to lens. I 
have had a few turkey Leitz lenses.

John Collier

On 25-Jan-05, at 11:33 PM, Frank Dernie wrote:

> Adhesives are widely used in almost every engineering discipline now. 
> It is lighter and cheaper and plenty strong and accurate enough. I do 
> not agree that the recent lenses are necessarily better than older 
> because of modern machining though. They certainly no longer need 
> massively skilled technicians to assemble them, but the old stuff, 
> hand assembled, shimmed and carefully inspected during assembly should 
> all be the same as each other within similar tolerances to recently 
> lenses, it just takes more manual skill and time to achieve the same 
> level of consistency.
> That is not to say the recent designs are not optically better, my 35 
> f1.4 aspherical is comfortably the best 35mm lens I have ever used, 
> obvious even on the RD1, it is just that my experience of precision 
> mechanics shows me that it is much cheaper and less skilled to reach 
> the same level of precision nowadays than 30 years ago, but the final 
> level of precision is no greater today than then. Materials, OTOH are 
> hugely better today than then.

In reply to: Message from mjblug at (Michael Blugerman) ([Leica] adhesives)
Message from s.dimitrov at (Slobodan Dimitrov) ([Leica] adhesives)
Message from rangefinder at (Didier Ludwig) ([Leica] adhesives)
Message from jbcollier at (John Collier) ([Leica] adhesives)
Message from Frank.Dernie at (Frank Dernie) ([Leica] adhesives)