[Leica] Answers About M8 in LFI

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

Hi Bob,

I don't know if I beleive that Leica IR filters are any different than those 
from Heliopan and B+W.  I'd bet Leica buys them from the filter makers and 
just remounts them or even orders them with their logo on them.

Gene

-------------- Original message from Robert Rose <robert.rose@mac.com>: 
-------------- 


> I just picked up a copy of the 2/2007 issue of LFI, and there are several 
> articles about the M8 that relate to questions that have been bouncing 
> around the LUG. 
> 
> Coding and the Tri-Elmar: There are micro switches that are activated by 
> the frame selector mechanism which tell the camera which of the three 
> focal 
> lengths is selected. P. 28 
> 
> Coding and flash: Here is the reason to code all your lenses (if you want 
> to use flash). Coding is used by the camera (among other things) to tell a 
> flash unit which focal length to zoom to. This would require a Metz 54Mz-4 
> with SCA Adapter 3502-M4 or 76Mz-5 with SCA3502-M5 adapter. P. 26. 
> 
> Aperture information is needed for the flash system, and is (cleverly I 
> think) obtained by using that little small round sensor that sits above 
> and 
> to the left of the red Leica logo. The light from the subject is compared 
> to 
> the light coming through the lens, and an aperture is inferred. This is 
> +/- 
> one stop in accuracy, which is good enough for the flash system, but it is 
> not recorded in EXIF because it is only an estimate. pp. 25, 48 
> 
> A Nikon SC-17 cable works well to allow the SF24D to be used off camera. A 
> mini soft box on the 24D works with the TTL. 
> 
> The Leica IR filters will have "different optical attributes to comparable 
> filters by B+W, Heliopan or Tiffen. Leica's adapted firmware may not even 
> deliver the best results when run with third-party filters; but since 
> these 
> all strive for the same effect and abide by the same principles, any 
> deviances would be nominal." p. 47 
> 
> White balance with an IR filter is "a little out of sorts" This will be 
> addressed in firmware 1.10. P. 48. 
> 
> The wide-angle cyan correction in firmware 1.10 will need both coding data 
> and aperture data, which is approximated using the little sensor near the 
> Leica logo (see above). P. 48 
> 
> So, that's my summary. It is an overall very interesting issue for M8 
> owners. 
> 
> Cheers, 
> Bob Rose 
> 
> 
> 
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