here somethin for you from Olympus to chew on Keith...i added the ''......'' (dots) to separate , the comment alongside the 1.2/50mm to highlight the one we are talking about and the 'YVMV' at the end...😀
Compatible Lens.........Recommended Focal Length and F Stop Range
Wide-angle
Zuiko Fish Eye 8 mm F2.8....F4-F8
Zuiko Fish Eye 16 mm F3.5.....F4-F8
Zuiko 18 mm F3.5......F5.6-F8
Zuiko 21 mm F2........F2.8-F8
Zuiko 21 mm F3.5......F4-F8
Zuiko 24 mm F2.........F2.8-F8
Zuiko 24 mm F2.8......F4-F8
Zuiko 28 mm F2.........F4-F8
Zuiko 28 mm F2.8......F5.6-F8
Zuiko 28 mm F3.5......F5.6-F8
Zuiko 35 mm F2.........F4-F8
Zuiko 35 mm F2.8.......F4-F8
Zuiko Shift 24 mm F3.5......F5.6-F8
Zuiko Shift 35 mm F2.8.......F4-F8
Standard
Zuiko 40 mm F2.......F4-F8
Zuiko 50 mm F1.2.....F4-F8 [quite poor for digital capture according to Olympus!]
Zuiko 50 mm F1.4......F2.8-F8
Zuiko 50 mm F1.8......F2.8-F8
Zuiko 55 mm F1.2......F2.8-F8
Tele
Zuiko 85 mm F2......F5.6-F8
Zuiko 100 mm F2......F2.8-F8
Zuiko 100 mm F2.8....F5.6-F8
Zuiko 135 mm F2.8.....F5.6-F8
Zuiko 135 mm F3.5......F5.6-F8
Zuiko 180 mm F2.........F2-F11
Zuiko 180 mm F2.8......F4-F8
Zuiko 200 mm F4.........F8-F11
Zuiko 200 mm F5.........F5-F5.6
Zuiko 250 mm F2.........F2-F11
Zuiko 350 mm F2.8.......F2.8-F11
Zuiko Reflex 500 mm F8.....F8
Macro
Zuiko Macro 50 mm F2......F2.8-F8
Zuiko Macro 50 mm F3.5....F3.5-F8
Zuiko Macro 80 mm F4.......F5.6-F11
Zuiko Macro 90 mm F2........F4-F8
Zuiko Macro 135 mm F4.5.....F4.5-F11
Zoom
Zuiko Zoom 28-48 mm F4
F5.6-F8 at focal length of 28-48 mm F11 also possible at focal length around 36 mm
Zuiko Zoom 35-70mmF3.5-4.5
F5.6 at focal length of 35-50 mm F8 also possible at focal length around 35 mm F4 also possible at focal length around 50 mm
Zuiko Zoom 35-70 mm F3.6
F5.6-F8 at focal length of 50-70 mm
Zuiko Zoom 35-70 mm F4
F8 at focal length of 35-50 mm F5.6 also possible at focal length around 35 mm
Zuiko Zoom 35-70 mm F4 (AF)
F8 at focal length of 35-50 mm F5.6 also possible at focal length around 35 mm
Zuiko Zoom 35-80 mm F2.8
F5.6-F8 at focal length of 35-80 mm F4 also possible at focal length around 35 mm
Zuiko Zoom 35-105 mm F3.5-4.5
F8 at focal length of 60-105 mm F5.6 also possible at focal length around 60 mm
Zuiko Zoom 50-250 mm F5
F8 at focal length around 250 mm
Zuiko Zoom 65-200 mm F4
F8 at focal length of 115-200 mm F5.6 also possible at focal length around 115 mm
Zuiko Zoom 75-150 mm F4
F5.6-F8 at focal length of 105-150 mm
Zuiko Zoom 85-250 mm F5
F5.6 at focal length of 150-250 mm F8 also possible at focal length around 150 mm
Zuiko Zoom 100-200 mm F5
F5.6-F11 at focal length of 140-200 mm F5 also possible at focal length around 200 mm
Lens release button
1Fit the Four Thirds Adapter into the camera’s lens mount by aligning the lens attachment marks and turn it in the direction of the arrow until it locks into position. ・To remove the Four Thirds Adapter, turn the lens in the opposite
direction while pressing down the lens release button. 2 Attach an Olympus OM system lens.
Notes
・Autofocus (AF) is not available. ・Stop-down metering is used. Spot metering mode does not work properly. ・Although it is possible to use the A (aperture-priority AE) mode in auto
exposure, the aperture display is not available. ・The aperture display is not available in M (Manual) exposure. ・In the P (Program AE) or S (Shutter speed-priority AE) mode, the shutter
releases, but the auto exposure control does not work. ・The distance scale on the OM system lens may not indicate the actual
distance. Always use the viewfinder for focusing. ・For recommended lenses, focal lengths and aperture (F-number) ranges,
see the OM system compatibility on the right. For inquiries, contact your nearest Olympus dealer.
Dimensions Weight
Main Specifications
: Ø 62 x 7.5mm (Ø 2.4 x 0.3 in) : 50g (1.8 oz)
Notes (1) The recommended values shown above are based on Olympus standards. [YVMV] (2) It is not recommended to use an OM system lens that is not listed above. (3) When an OM system lens is mounted on a Four Thirds System SLR camera, the image
angle will be equivalent to that of a 35mm film camera lens with double the focal length.