[rollei_list] Re: Rolleiflex FT focusing mechanism
- From: Eric Goldstein <egoldste@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Wed, 27 Oct 2010 09:47:28 -0400
Hi Carlos -
OK, I see where your going, and I also see where it would seem
possible/practical. But that's a complex zoom with a gajillion lens
groups and elaborate internal focusing. I don't a relatively simple
highly corrected prime with a simple lens internal mount could go
there.
A back on the napkin product calculus for a camera like this would
start with production cost under 10% of the final retail sale price. A
$5000 camera should cost no more than $500 to produce (excluding R&D
and marketing). The lens costs alone for the camera could well be
close to half of that with relatively simple optics... I'm thinking
complex optics such as you describe would be off the charts...
Eric Goldstein
--
On Wed, Oct 27, 2010 at 9:35 AM, CarlosMFreaza <cmfreaza@xxxxxxxxx> wrote:
> Hi Eric:
> My now pretty old Pentax A 28-80 zoom at 80mm has a position
> where the nearest focusing distance becomes a few centimeters from the
> subject, a special lens element integrated into the general lens
> allows it (a lot of zooms have similar feature); I thought something
> similar could be possible for the dedicated FT Tele-Xenar considering
> the new optical glasses and plastics and floating and aspheric
> elements and computer software available for the lens designer and in
> spite of the traditional mathematics for optics.
>
> Carlos
>
>
> 2010/10/27 Eric Goldstein <egoldste@xxxxxxxxx>:
>> On Wed, Oct 27, 2010 at 8:52 AM, CarlosMFreaza wrote: (snipped)
>>
>>> I really thought
>>> that the 1,5m nearest focusing distance was obtained via the new lens
>>> optical formula mainly thanks to some powerful elements combo as
>>> commented in some forums and with some slight modifications for the
>>> focusing parts.
>>
>>
>>
>> Hi Carlos -
>>
>> How would this be possible?
>>
>>
>> Eric Goldstein
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