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 Subscribing Member

    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

    View attachment 54018



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

    View attachment 54019



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

    View attachment 54020



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

    View attachment 54021
     
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  2. roundball

    roundball TalkEmount Hall of Famer Subscribing Member

    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.