[rollei_list] Re: OT: Stereo Photography

I agree. And lenses just get better and better. Even the Chinese made lenses
(Samyang) are suppose to be very good.

On Thu, Jul 22, 2010 at 4:34 PM, Richard Knoppow <dickburk@xxxxxxxxxxxxx>wrote:

>
> ----- Original Message ----- From: "Allan Derickson" <
> alland435@xxxxxxxxxxx>
>
> To: <rollei_list@xxxxxxxxxxxxx>
> Sent: Wednesday, July 21, 2010 3:18 PM
> Subject: [rollei_list] OT: Stereo Photography
>
>
>
>  I've thought of trying some stereo photographs with one of my TLRs.
>>  Rollei
>> even had an accessory sliding mount for just such a purpose.  I think it
>> slid the camera about two and a half inches for the second shot-similiar
>> to
>> the distance between human eyes.  You then produce contact prints and
>> obtain
>> or construct one of those old-time handheld viewers. I read somewhere that
>> this will produce a stereo effect when the subjects are relatively close.
>> How would you calculate the necessary lateral movement when the subjects
>> are
>> far away, say like formations in the Grand Canyon taken from the rim?
>>
>>    I don't think anyone answered this. The distance between the lenses
> should always approximate the inter-ocular distance, approximately 65mm.
> However, at great distances, there is virtually no stereo effect. However,
> there is nothing wrong with using any arbitrary spacing for an exagerated or
> enhanced stereo effect. This done commonly in aerial photography where two
> photographs taken a few seconds apart as the aircraft is moving can be fused
> into a stereo image. There are viewers made for examining aerial photos
> consisting of magnifying eyepieces with two mirrors on each side to get the
> right spacing. Sometimes one finds old aerial survey photos which have
> inadvertent stereo pairs. I remember looking at some years ago at the UCLA
> geography department which had the archives of two of the old time aerial
> survey companies operating in the Los Angeles area (Spence was one and I am
> drawing a blank on the other). Among the pictures were some of the Twentieth
> Century-Fox movie lot. I could easily see people in the photos when looked
> at in stereo. When looking at single images I could tell they were people
> after seeing the stereo images but would never have known otherwise.
>   Ideally, for stereo the lenses should also face inward slighly just as
> one's eyes do but I don't know of any stereo cameras which actually do this.
>   The problem with the slider is that one can take only still life with it.
> The closest two Rollei camras can be placed results in about a four inch
> spacing between lenses. This would be fine for photographing distant objects
> where one wanted enhanced stereo. I have seen rigs for using two 35mm
> cameras oriented vertically, cameras like the Leica thread mount models can
> be close enough for proper spacing when mounted this way.
>    One of my continuing regrets was not buying a Heidoscope (or maybe it
> was a Rolleidoscope) I saw at a camera swap meet many years ago. I don't
> think they wanted much for it then and I could have gotten it. I have rarely
> seen others and always for high prices.
>
>
> --
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
> ---
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-- 
Peter K
Ó¿Õ¬

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