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21% Waning Crescent Moon Shots with recently received Canon FDn 100-300/5.6-L

Discussion in 'Scenic, Architecture, and Travel' started by roundball, Dec 17, 2014.

  1. roundball

    roundball TalkEmount Hall of Famer

    Oct 8, 2013
    USA
    Per its predictable flight schedule, the 21% Waning Moon got into the same shooting position this morning almost an hour later than yesterday. I had a clear cold sky so I was able to get some test shots using the recently received Canon FDn 100-300/5.6-L at 300mm.
    Both F11 and F16 showed detail with adequate light using the native lens at 300mm.

    Then I added the 2x-B Extender and the results were so dark as to be unusable…didn’t discover that until after-the-fact looking at them on my PC so I’ll have to retest with more open apertures than I’m used to using and see what I can learn.(None of them are included here)




    TESTING CANON FDn 100-300/5.6-L @ 300mm, ISO200, F11, 1/125 - Original





    TESTING CANON FDn 100-300/5.6-L @ 300mm, ISO200, F11, 1/125 - Cropped





    TESTING CANON FDn 100-300/5.6-L @ 300mm, ISO200, F16, 1/125 - Original





    TESTING CANON FDn 100-300/5.6-L @300mm, ISO200, F16, 1/125 - Cropped

     
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  2. roundball

    roundball TalkEmount Hall of Famer

    Oct 8, 2013
    USA
    Just occurred to me...the dark results on a few shots with the 2x-B Extender was a loose nut behind the camera.

    After adding the Extender, without thinking I continued to use my normal moon shot aperture setting of F11, forgetting that I was already losing 2 stops of light from the Extender. Instead of continuing to mechanically set aperture at F11 as I normally do for moon shots, I should have just left the 5.6 lens at its wide open mechanical aperture of 5.6 and the Extender would have made the 2 stop difference in light to equal that of F11.

    In essence, I was shooting F22 with the Extender installed AND aperture mechanically closed down to F11.