DMJ Posted August 30, 2013 Share #1 Â Posted August 30, 2013 Advertisement (gone after registration) Dear All, Â I noted something in the last week & just wondered if it's normal. Â I'm new to manual focus lenses & am using a M240 & Apo Summicron 50mm. When I take pictures with the lens fully open at f 2.0 & transfer them into Lightroom it seems to almost randomly allocate a f value. Usually 2.4 but often 2.8. I know that the lens was at 2.0 because I was testing it as I had my suspicions. Â Is this normal? Does Lightroom have a funny way of working it out? Should the information be being transferred correctly, implying a fault with my lens. Â Martin Link to post Share on other sites More sharing options...
Advertisement Posted August 30, 2013 Posted August 30, 2013 Hi DMJ, Take a look here F value in Lightroom 5. I'm sure you'll find what you were looking for!
stunsworth Posted August 30, 2013 Share #2 Â Posted August 30, 2013 There's no linkage between the lens and the camera body that could supply this information, so the camera makes a 'best guess' using the difference in light intensity between that recorded by the main sensor, and that recorded by the small sensor on the front of the camera. It's not totally accurate, hence the odd results from time to time. Link to post Share on other sites More sharing options...
DMJ Posted August 30, 2013 Author Share #3 Â Posted August 30, 2013 Stunsworth, thank you for that. Makes sense. After all it's the image that counts not the little numbers on the side. Â Martin Link to post Share on other sites More sharing options...
Jeff S Posted August 30, 2013 Share #4 Â Posted August 30, 2013 Martin, you may want to read the two forum FAQs (at the top of the page), on the M9, etc. as well as the one on the M240, that covers this and various other useful information and tips. Â Jeff Link to post Share on other sites More sharing options...
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