[Leica] IR cut filters, lens coding and firmware 1.102

[len-1 at comcast.net (Leonard Taupier)]

Good test Howard. I opened all four photos and superimposed them to  
see the sky difference. There certainly is a difference. I'm in a  
situation that I'm sure some of us are in. I have IR/UV filters for  
lenses that are not coded and a coded lens with no filter. So for me  
your test was timely. I'm still waiting for my coded lenses and  
filters from Leica.

Cheers,
Len


On Apr 12, 2007, at 10:42 PM, Howard Cummer wrote:

> Hi Luggers,
> As you know I'm retired and so have time for experiments. I have  
> downloaded the M8 firmware update and borrowed a coded standard  
> (not wide) Tri Elmar (thank you Ray). I have a Heliopan IR cut  
> filter and this morning I have taken four pictures in the following  
> combinations. Here are the details in the order they come up in the  
> Leica Gallery:
>
> 4. Lens detection on setting at UV / IR (this is an additional  
> setting with the new firmware - before you just had Lens detection  
> on or off). IR filter on lens. shutter speed 1/500 f8.0 28mm ISO 160
>
> 3. Lens detection on  but not UV /IR setting. IR filter on lens  
> 1/500 f8.0 28mm
>
> 2. Lens detection on but no IR filter on lens 1/750 f 8.0 28mm
>
> 1. Lens detection off no IR filter on lens. 1/750 f8.0 28mm
>
> All four pictures were taken at ISO 160 - shot in DNR and developed  
> in CS2 . Details in the picture summaries. I used the 28mm setting  
> of the Tri Elmar reasoning that corner correction (if any) would be  
> greater with the wide angle view.
> Interestingly the shutter speed was 1/750 without the IR filter and  
> it fell to 1/500 when the IR filter was put on.
>
> Here's the URL:
>
> http://gallery.leica-users.org/v/Howard+Cummer/UV+IR+Code+Pix/
>
> http://tinyurl.com/34xub4
>
> Do you see any differences?
>
> Cheers
>
> Howard (in Hong Kong)
>
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