[Leica] math challenged

[h_arche at yahoo.com (H. Ball Arche)]

"Yes, but the wides are the normals for the 1.3x crop, so you want the wider 
VF."



Whoa, you lost me.

If a 50mm lens taking in a 40 degree wide field of view is considered 
'normal' (Mark, forgive me) in 35mm photography, 
then with a 1.3 crop factor, isn't a 35 going to take in approximately the 
same 40 degree field of view?

40 degrees is 40 degrees, regardless of the focal length of the lens that is 
projecting that slice of space, and you adjust the VF magnification to suit, 
which means going with a narrower (than 0.71) VF doesn't it? Don't the 35's 
'normal' framelines (40 degrees) float well in from the edges of the M8's 
0.68 VF? The M3's 0.91 VF has 40 degree wide framelines that pretty much 
fill the window. 

I went to the Leica site looking to see if they had a series of frameline 
views for the M8 like they have for the ala carte options for the MP/M7 but 
couldn't find anything.




----- Original Message ----
From: Richard Man <richard.lists at gmail.com>
To: Leica Users Group <lug at leica-users.org>
Sent: Saturday, September 5, 2009 2:44:36 PM
Subject: Re: [Leica] math challenged

Yes, but the wides are the normals for the 1.3x crop, so you want the wider 
VF.

It really only matters regarding focusing accuracy, and with the 1.3x
crop, you get more DoF on the same aperture, so the lower mag factor
is canceled out. Certainly you see people shooting F1 all day long on
the M8 with spot on focus so the RF/VF is not an issue in that regard.

On Sat, Sep 5, 2009 at 12:22 PM, H. Ball Arche<h_arche at yahoo.com> wrote:
> OK, so I just learned that the M8's have a 0.68 VF. My question is, what 
> does that translate into, relative to the crop factor of that sensor?  In 
> other words, is it like what an approximately 0.45 VF would show you on a 
> FF camera?
>
> Since 0.72 has been the 'standard' VF since the M2, I'd have figured that 
> in the M8 they would want to reproduce the same relative field of view, 
> lens for lens, narrowing it appropriately.
>
> If I'd've bothered to wonder about it I would have figured the M8 VF to be 
> 0.86, or 0.91 like the M3 - something narrower than 0.72.
>
> The 0.68 field of view VF in the M8 must REALLY favor the wides, taking in 
> a much broader field of view than would the 0.58 VF with the same lens on 
> a full frame camera.
>

-- 
// richard m: richard @imagecraft.com
// w: http://www.imagecraft.com/pub/Portfolio09/ blog:
http://rfman.wordpress.com
// book: http://www.blurb.com/bookstore/detail/745963

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