Archived posting to the Leica Users Group, 2013/09/11

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Subject: [Leica] West From Mount Greylock, MA
From: jim at hemenway.com (Jim Hemenway)
Date: Wed, 11 Sep 2013 21:56:12 -0400
References: <522F7A55.9050204@hemenway.com> <F0CA3C27-7601-46AA-8E6B-64483CB946BB@gmail.com>

hi Lluis;

Thanks for looking.

As you may know, infrared light focus on a slightly different plane than 
does visible light.

Most quality lenses used to be manufactured with a tiny red line on the 
focusing or aperture ring, which indicated where one would adjust the 
lens after focusing with visible light.

So after I used the AF, with its built in infrared capabilities to 
focus, I adjusted the lens to the place where I thought that such a tiny 
red line should be,

I guess that I was off a bit, hence the "little' softness that you see 
in this image.

Best Regards,

Jim H



On 9/10/13 5:15 PM, Lluis Ripoll wrote:
> Nice B&W Jim, maybe a little too soft but nice
>
> cheers
> Lluis
>
> El 10/09/2013, a las 22:00, Jim Hemenway<jim at hemenway.com>  escribi?:
>
>> There is only a small amount of infrared light available in late October, 
>> and with a storm coming from the West even that was limited last Autumn;
>>
>> http://www.hemenway.com/WestFromMount%20Greylock.jpg
>>
>> Pentax isDS with R72 filter.
>>
>> Jim H
>>
>> _______________________________________________
>> Leica Users Group.
>> See http://leica-users.org/mailman/listinfo/lug for more information
>
> _______________________________________________
> Leica Users Group.
> See http://leica-users.org/mailman/listinfo/lug for more information
>


In reply to: Message from jim at hemenway.com (Jim Hemenway) ([Leica] West From Mount Greylock, MA)
Message from lluisripollquerol at gmail.com (Lluis Ripoll) ([Leica] West From Mount Greylock, MA)