Angle of View

[neillat]

I took some measurements from a Rodenstock 240mm Sironar S, I have.

I am trying to understand how much distance I will have in the frame of an 8x10 camera, Landscape.

The specs for the lens state an Angle of coverage of 75 degrees.

I took the camera out and took some measurements:

Lens to Subject = 9ft

Landscape width measured = 8ft 3in

to my Calculations this gives an Angle of Coverage of 50 degrees, not 75...

Is my missing connection, focused at infinity?

Neil.:confused:

[AJ Edmondson]

Hard to tell from the information given... are you confusing angle of view and angle of coverage?

Joel

[Leigh]

I don't understand your question.

The published image circle for the 240/5.6 APO-Sironar-S is 372mm.

Is that your lens, or do you have a SINARON-S ?
This was a Sinar-branded Rodenstock Sironar-N lens. Its image circle is 340mm.

Both image circles are at infinity and f/22.

- Leigh

[Bruce Watson]

http://www.largeformatphotography.info/forum/showthread.php?9856-angle-of-coverage-focal-lenght

See my answer #9 in the above thread.

[neillat]

http://www.largeformatphotography.info/forum/showthread.php?9856-angle-of-coverage-focal-lenght

See my answer #9 in the above thread.

Very good thank you.

[Tony Evans]

Image circle 372mm & 240mm FL = 75.55 degrees coverage, as claimed.