DLS Posted September 30, 2015 Share #1 Posted September 30, 2015 Advertisement (gone after registration) I realize this may a dumb question but here goes: when using a 2x APO extender with a 280/f4 I lose two stops, correct? But what does this mean for the actual setting on the lens itself, e.g., when it indicates f/4, is it really f/8, and when f 5.6, really f/11 --- OR --- does moving the setting on the lens have no impact UNTIL you reach the 2 stop difference, meaning that there is no impact when lens is at f/4 or f/5.6...I only ask because the EXIF data provided by an M240 is a guess in any case and can be all over the place. Thanks for any insight you can provide. 1 Quote Link to post Share on other sites More sharing options...
Advertisement Posted September 30, 2015 Posted September 30, 2015 Hi DLS, Take a look here Question on 2x APO extender aperture. I'm sure you'll find what you were looking for!
stuny Posted September 30, 2015 Share #2 Posted September 30, 2015 Whatever setting you have on your lens by adding the 2X extender you will have two stops less light available. The f/stop itself does not change, only the amount of light reaching the sensor or film. 2 Quote Link to post Share on other sites More sharing options...
wildlightphoto Posted September 30, 2015 Share #3 Posted September 30, 2015 The effective aperture is reduced by two stops in all cases. For example when the lens aperture is set at f/4, the effective aperture for the lens + extender is f/8. When the lens is set at f/5.6, the effective aperture for the combination is f/11. 1 Quote Link to post Share on other sites More sharing options...
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