CANADIAN LANCASTER - F24 CAMERA
This F24 camera is held in the collection of the Canadian Aerospace Museum, Toronto.
 
lanc_f24_01.jpg
The notched arc defines the various aperture settings. 
lanc_f24_02.jpg
Camera weight is approximately 21 pounds. 
lanc_f24_03.jpg
That  is an electrical connector at the side of the camera. 
lanc_f24_04.jpg
Later in WWII, it  became clear that the F.24 with its small 5" x 5" format and when fitted with the smallest lens, was too small for detailed photo interpretation, especially as the camera-carrying aircraft  was flying at a high altitude. 
lanc_f24_05.jpg
All photos in this table by Jerry Proc
lanc_10mrmp_f24_camera_mount_b1.jpg
An illustration of the forward type 25 mount for an F24 camera in the Lancaster 10MR/MP. (Engineering Manual sketch) 
 
Credits and References:

1) Cameras web site.  http://images.google.ca/imgres?imgurl=http://www.airrecce.co.uk/cameras/F24-col.JPG&imgrefurl=
http://www.airrecce.co.uk/cameras/raf_ww2_cameras.html
&usg=__7gFyft9LUGPfa-F1U_nD0i9in0E=&h=323&w=292&sz=18&hl=en&start=
2&um=1&tbnid=sR2_6-StKB7DRM:&tbnh=118&tbnw=107&prev=/images%3Fq
%3Df24%2Bcamera%26hl%3Den%26rlz%3D1T4GGLR_enCA219CA219%26um%3D1
2) Lancaster engineering manual EO 05-25A-2 dated 30 August 1957

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Nov 17/09