[LRflex] Re: Macro - Elpro or Tube?


On 25/09/2005 at 6:12 PM Douglas Sharp wrote:

>Interesting,
>I have a rather clever , and extremely heavy, Beroflex 3,5-4,3/35-100mm 
>zoom, in C/Y, mount which has a built-in close focus function.
>By turning a ring you can shift the whole optical construction further 
>away from the film plane.

Douglas:

That makes sense.  Obviously, the makers decided that the optical results=
 would be OK (or, just felt they needed to have the feature to be=
 competitive) and went that route.

For those who may not know, the difference between a 'zoom' lens and a=
 'variable focal length' lens is that with the VFL lens, you must re-focus=
 after each change in focal length.  A zoom lens can be focused at full=
 tele and then 'zoomed' back to wide, without changing the focus. (It will=
 go the other way, too - but focusing errors at the w/a end make it=
 unwise.)

For close-focus work, where the focusing is often done by 'rocking' the=
 camera to achieve the correct focus point, this distinction would be moot.=
  Thus I can see Beroflex going this route.

I'd be intersted to hear what quality the Beroflex lens gets in c/u mode.=
 Am I issuing a challenge?  You bet!  ;-)

Cheers!

David Young,
Logan Lake, BC    
CANADA. 

Personal Web-site at: http://www3.telus.net/~telyt
Leica Reflex Forum web-page: http://www3.telus.net/~telyt/lrflex.htm

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