[Leica] CV 15mm lens on M8

[grduprey at mchsi.com (grduprey@mchsi.com)]

Geoff,

The 24 frame is the largest, however, the area around the 24 mm frame is the 
approximate view from a 21 mm lens.  I verified this a year ago at the M8 
seminar in Chicago.   So if you want to use a 21mm lens on the M8, as long 
as you can see the entire viewfinder window, you do not need an external VF 
on the M8.  This would give you the view of a 28mm lens on a 35 mm film M.

Gene

-------------- Original message ----------------------
From: "Geoff Hopkinson" <hoppyman@bigpond.net.au>
>
> Steve, your 24mm lens virtually fills the M8 viewfinder. That is the widest
> frameline built-in. I don't know how you can see anything outside that
> frameline. Due to the (smaller than 24x36) sensor crop, that frameline 
> shows
> you an approximation of the crop effect (about the same view angle as a 
> 32mm
> on a film M)
> To use a 15mm lens you should use an external finder which is designed for 
> a
> 21mm lens on a film M.
> All of the framelines show less than the actual sensor capture anyway. 
> (they
> are calibrated for the view at .7m) 
> The key is to think of the framelines as approximating the view angle, not
> the nominal focal length. Each lens produces the same image at the plane of
> focus on any M. The M8 sensor, being smaller than 24x36, actually captures
> about 75% of it.
> 
> Cheers
> Geoff
> http://www.pbase.com/hoppyman/e
> http://gallery.leica-users.org/v/gh/
> -----Original Message-----
> From: lug-bounces+hoppyman=bigpond.net.au@leica-users.org
> [mailto:lug-bounces+hoppyman=bigpond.net.au@leica-users.org] On Behalf Of
> Steve Barbour
> Sent: Friday, 28 March 2008 02:06
> To: Leica Users Group
> Subject: [Leica] CV 15mm lens on M8
> 
> a question here , as my logic becomes  befuddled...
> 
> 
> A 21mm lens on the M8 just about fills the M8 viewfinder...
> 
> a CV heliar 15mm lens on the M8 is really a 21mm lens, and can be used  
> with a 21mm external viewfinder...
> 
> so... can one also use the M8 viewfinder, as the viewfinder for a CV  
> 15mm lens...?
> 
> 
> Why is this so difficult?
> 
> (a yes or no answer is inadequate, without some logical explanation...  
> please)
> 
> 
> thanks, Steve
> 
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> "I never wanted to be famous"
> http://www.blurb.com/bookstore/detail/186890
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