7x17 ULF users - short lenses?

"Christopher Perez" wrote

[...]

How about a Carl Zeiss Hologon 110mm F1:8?

"Christopher Perez" wrote

[...]

How about a Carl Zeiss Hologon 110mm F1:8?

"jjs" wrote in message ...
"Christopher Perez" wrote

[...]

How about a Carl Zeiss Hologon 110mm F1:8?

Follks,

What about a 210 angulon (not super), they came in modern shutters?

Kirk

"jjs" wrote in message ...
"Christopher Perez" wrote

[...]

How about a Carl Zeiss Hologon 110mm F1:8?

Follks,

What about a 210 angulon (not super), they came in modern shutters?

Kirk

"jjs" wrote in message ...
"Christopher Perez" wrote

[...]

How about a Carl Zeiss Hologon 110mm F1:8?

Follks,

What about a 210 angulon (not super), they came in modern shutters?

Kirk

"jjs" wrote in message
...
"Christopher Perez" wrote

[...]

How about a Carl Zeiss Hologon 110mm F1:8?

Well... A 110mm lens would have to cover 130 degrees to
cover a 7x17 film. I don't think even the Hologon would make
it (more like 110 degrees). 1:8 means f/8 for those who
think you meant f/1.8 Now an f/1.8 lens of this sort would
be truly remarkable.
A Goerz Hypergon of 110mm would cover with a little left
over (140 degrees). But you really need the spinning front
stop, the light fall off from center to edge is around 8
stops, maybe more.

--
---
Richard Knoppow
Los Angeles, CA, USA

(Kirk Fry) wrote in message . com...
"jjs" wrote in message ...
"Christopher Perez" wrote

[...]

How about a Carl Zeiss Hologon 110mm F1:8?

Follks,

What about a 210 angulon (not super), they came in modern shutters?

Kirk


I don't think the Angulon will make it. 7x17 requires an image
circle of about 470mm diameter. To cover this a 210mm lens operates at
96 degrees. An Angulon covers about 90 degrees although the circle of
illumination is larger than this, about 102 degrees. So, it probably
won't vignette but the image quality near the margins will not be very
good. The Angulon has a very large image circle because of the extra
large first and last elements but the Wide Angle Dagor has better
correction and about the same actual coverage, about 90 degrees. For
greater coverage, at least with decent image quality, you need a
modern W.A. lens.

Richard Knoppow
Los Angeles, CA, USA

(Kirk Fry) wrote in message . com...
"jjs" wrote in message ...
"Christopher Perez" wrote

[...]

How about a Carl Zeiss Hologon 110mm F1:8?

Follks,

What about a 210 angulon (not super), they came in modern shutters?

Kirk


I don't think the Angulon will make it. 7x17 requires an image
circle of about 470mm diameter. To cover this a 210mm lens operates at
96 degrees. An Angulon covers about 90 degrees although the circle of
illumination is larger than this, about 102 degrees. So, it probably
won't vignette but the image quality near the margins will not be very
good. The Angulon has a very large image circle because of the extra
large first and last elements but the Wide Angle Dagor has better
correction and about the same actual coverage, about 90 degrees. For
greater coverage, at least with decent image quality, you need a
modern W.A. lens.

Richard Knoppow
Los Angeles, CA, USA