[LargeFormat] Convertible lenses

[Ole Tjugen]

There are many convertible lenses, and several different constructions.  
There are even some well-known lenses which were intended as convertibles,  
but have not been marketed as such.

The only convertibles I have any experience with are Symmars and Angulons  
(!).

Convertible Symmar lenses are good when "whole", and give decent  
performance when converted. Certainly good enough for contact printing,  
but I would not shoot colour intended for enlargement this way.

Angulons were originally intended as convertible normal lenses with lots  
of coverage, and can very well be used as such. A 90/6.8 converts to  
140/12, 120/6.8 to 185/12, and 165/6.8 to 260/12. The performance of half  
a 165/6.8 Angulon on 5x7" film is quite good - I was surprised when I  
tried this. From that a 120 should be good on 4x5", and a 210 on 8x10".

Ole Tjugen

On Thu, 16 Dec 2004 10:51:20 -0800 (PST), Kent Gibbs  
<kent_gibbs@yahoo.com> wrote:

> I am considering purchasing a convertible lens to try to keep my kit
> manageable and would like everyone's thoughts on the pluses and minuses
> of these types of lenses.
>
> Thanks
>
> Kent
>
>
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