Archived posting to the Leica Users Group, 2012/07/21

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Subject: [Leica] Some technical speculations re: rangefinder
From: richard at richardmanphoto.com (Richard Man)
Date: Sat, 21 Jul 2012 11:42:01 -0700
References: <CAF8hL-EMSebH=YGfXU=qpuVyMbZxGjfH9cebK-BNVAS6oCMMkQ@mail.gmail.com> <p06240809cc308b2b92c9@192.168.1.103>

Thanks Herb. I am aware of that. I am referring to the size of the
framelines. As you get closer, the coverage should get smaller.

On Sat, Jul 21, 2012 at 9:39 AM, Herbert Kanner <kanner at acm.org> wrote:

> Richard,
>
> We already have parallax adjustment based on focusing distance on all M?
> cameras. Hold your camera very steady and watch the frame lines as you
> focus from minimum distance to infinity. If it isn't visible on those 28mm
> lines, shift the control to 35mm or longer or put in a longer lens.
>
> Regards,
>
> Herb
>
>
>
>
>  Speculating on an ideal optical rangefinder system (i.e. something that
>> retains the Leica M DNA and yet improves on the 1950 state of the art M3),
>> what if a rangefinder has the following features:
>>
>> - LED projected framelines. This removes the clutter, solves the
>> visibility
>> issue, and
>>
>> - changeable rangefinder magnification - what if the rangefinder has 0.58x
>> to 1.2x mag builtin (may be in 4 steps: 0.58x, 0.72x, 0.9x and 1.2x or
>> something similar)? This would allow more precise focusing from the wide
>> to
>> tele. This will leverage the existing frame line trigger and 6 bit coding
>> system of course so this would be automatic
>>
>> - parallax adjustment based on focusing distance
>>
>> We know LED framelines can be done. The M9 Titanium has it.
>>
>> The XPan has 2 magnifications: one for the 45mm lens and one for the 90mm
>> lens. I have no idea how difficult it is to insert multiple mag piece as
>> needed. Anyone knows?
>>
>> The cam position should also give good indication of the focusing distance
>> too, along with the lens info, so #3 is technically feasible too.
>>
>> Chances are Leica nor anyone else would really spend the resource to
>> develop something like these, since a CMOS/Liveview is so much "simpler,"
>> but would it be nice to have such a system?
>>
>> --
>> // richard 
>> <http://www.richardmanphoto.**com<http://www.richardmanphoto.com>
>> >
>>
>> ______________________________**_________________
>> Leica Users Group.
>> See 
>> http://leica-users.org/**mailman/listinfo/lug<http://leica-users.org/mailman/listinfo/lug>for
>>  more information
>>
>
> --
> Herbert Kanner
> kanner at acm.org
> 650-326-8204
>
> Question authority and the authorities will question you.
>
>
> ______________________________**_________________
> Leica Users Group.
> See 
> http://leica-users.org/**mailman/listinfo/lug<http://leica-users.org/mailman/listinfo/lug>for
>  more information
>



-- 
// richard <http://www.richardmanphoto.com>


Replies: Reply from kanner at acm.org (Herbert Kanner) ([Leica] Some technical speculations re: rangefinder)
In reply to: Message from richard at richardmanphoto.com (Richard Man) ([Leica] Some technical speculations re: rangefinder)