850mm f/4.0 lens

RichA writes:

http://www.surplusshed.com/pages/item/t1653.html

For 8 or 16mm film?

For large roll film; 70mm or larger, up to 18" or so.

The actual description is "36 inch F/4.0 Aerial lens"; focal length in
inches plus "aerial" flags it as intended for aerial surveillance work,
which was done using large roll films in that era.
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On Mon, 29 Oct 2012 14:22:49 -0500, David Dyer-Bennet
wrote:

RichA writes:

http://www.surplusshed.com/pages/item/t1653.html

For 8 or 16mm film?

For large roll film; 70mm or larger, up to 18" or so.

The actual description is "36 inch F/4.0 Aerial lens"; focal length in
inches plus "aerial" flags it as intended for aerial surveillance work,
which was done using large roll films in that era.

Probably in a Schmidt camera or similar which used a vacuum to suck
the film back into a template shaped to correspond with the lens's
actual focal plane.
--

Regards,

Eric Stevens

Eric Stevens wrote in
:

On Mon, 29 Oct 2012 14:22:49 -0500, David Dyer-Bennet
wrote:

RichA writes:

http://www.surplusshed.com/pages/item/t1653.html

For 8 or 16mm film?

For large roll film; 70mm or larger, up to 18" or so.

The actual description is "36 inch F/4.0 Aerial lens"; focal length in
inches plus "aerial" flags it as intended for aerial surveillance work,
which was done using large roll films in that era.

Probably in a Schmidt camera or similar which used a vacuum to suck
the film back into a template shaped to correspond with the lens's
actual focal plane.

No, I've seen a Baker Super Schmidt (17" front element) but the Surplus
Shed lens is definitely a refractive lens, no mirrors.

On Mon, 29 Oct 2012 14:22:49 -0500, David Dyer-Bennet
wrote:

RichA writes:

http://www.surplusshed.com/pages/item/t1653.html

For 8 or 16mm film?

For large roll film; 70mm or larger, up to 18" or so.

The actual description is "36 inch F/4.0 Aerial lens"; focal length in
inches plus "aerial" flags it as intended for aerial surveillance work,
which was done using large roll films in that era.

http://www.europeana.eu/portal/recor...598AA7168.html

"... used on U-2 reconnaissance missions."
--

Regards,

Eric Stevens

On Mon, 29 Oct 2012 18:08:24 -0500, Rich wrote:

Eric Stevens wrote in
:

On Mon, 29 Oct 2012 14:22:49 -0500, David Dyer-Bennet
wrote:

RichA writes:

http://www.surplusshed.com/pages/item/t1653.html

For 8 or 16mm film?

For large roll film; 70mm or larger, up to 18" or so.

The actual description is "36 inch F/4.0 Aerial lens"; focal length in
inches plus "aerial" flags it as intended for aerial surveillance work,
which was done using large roll films in that era.

Probably in a Schmidt camera or similar which used a vacuum to suck
the film back into a template shaped to correspond with the lens's
actual focal plane.

No, I've seen a Baker Super Schmidt (17" front element) but the Surplus
Shed lens is definitely a refractive lens, no mirrors.

So is the camera I had in mind. I've confirmed that I am wrong in
thinking it was a Schmidt. What could it have been that I had in mind?
--

Regards,

Eric Stevens

On 30/10/2012 03:48, Eric Stevens wrote:
On Mon, 29 Oct 2012 18:08:24 -0500, Rich wrote:

Eric Stevens wrote in
:

On Mon, 29 Oct 2012 14:22:49 -0500, David Dyer-Bennet
wrote:

RichA writes:

http://www.surplusshed.com/pages/item/t1653.html

For 8 or 16mm film?

For large roll film; 70mm or larger, up to 18" or so.

The actual description is "36 inch F/4.0 Aerial lens"; focal length in
inches plus "aerial" flags it as intended for aerial surveillance work,
which was done using large roll films in that era.

Probably in a Schmidt camera or similar which used a vacuum to suck
the film back into a template shaped to correspond with the lens's
actual focal plane.

No, I've seen a Baker Super Schmidt (17" front element) but the Surplus
Shed lens is definitely a refractive lens, no mirrors.

So is the camera I had in mind. I've confirmed that I am wrong in
thinking it was a Schmidt. What could it have been that I had in mind?

Some other fast optical design that uses a curved focal plane for a
tradeoff of distortion against optimised point spread function off axis.

--
Regards,
Martin Brown