[Leica] CV 15mm lens on M8

[hoppyman at bigpond.net.au (Geoff Hopkinson)]

Gene, for me I can just see the frameline for the 24 at the edges of the M8
finder. I need to slightly move my eye position to see the whole frame. I
don't wear glasses to shoot. Maybe my eye needs calibration. I might get the
6 bit conversion done on my eyeball while it is at Solms. Yes, you might
ignore the frames and just accept the approximation of the entire finder, if
that suits you. 
15mm is only a nominal value anyway, and further will give nominally the
view angle of a 20mm on a film camera. Then the accuracy is affected by the
focus distance and you have the limitations of the RF system in general.
It is all approximation. Also the framelines are effectively quite
conservative as they are optimized for .7m. I do not know why Leica made
that decision rather than set up the finder as with the film M's. The effect
for me, shooting at say 2m is that the actual coverage is approximately two
frameline widths outside the nominal frameline.
The practical solution as said by Ted, is just shoot and check for yourself 

Cheers
Geoff
http://www.pbase.com/hoppyman/e
http://gallery.leica-users.org/v/gh/

-----Original Message-----
Subject: RE: [Leica] CV 15mm lens on M8

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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