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  1. doug

    Long Lenses

  2. doug

    Why is aperture backwards??

    The effect of the inverse square law is normalized by dividing by the focal length. f/2 is f/2 no matter how far the aperture is from the image plane and no matter what the aperture's physical diameter is.
  3. doug

    Sony A1 powerhouse

    Looks like the a7riII will become a backup body :)
  4. doug

    Why is aperture backwards??

    Yes there's a stop of light difference between f/1.4 and f/2 but it's not because of the inverse square law. It's because the area of the aperture - the opening the light passes through - at f/2 is half of the area at f/1.4
  5. doug

    Z9

    They need to ship some product before I get excited.
  6. doug

    Z9

    This proposed Z9 doesn't interest me, it's much too big. I'm currently using Sony mirrorless with serious lust for the PF lenses. My fantasy camera would be a1 size & performance with the 300mm and 500mm PF. As I see it the whole point of this announcement was to slow the bleeding of user...
  7. doug

    Long Lenses

  8. doug

    Sony A1 powerhouse

    After yesterday having the AF lock onto rough tree bark and foreground weeds instead of the intended birds I'm almost ready to throw caution and wallet to the wind. Help me out here! Does the bird eye AF work as well as you'd hoped?
  9. doug

    Long Lenses

  10. doug

    Voigtländer 35/2

    APO isn't a lens element. It's the overall correction of aberrations of the entire lens. I get a bit jaded by announcements of new lenses but my experience with the 65mm APO-Lanthar makes me sit up and take notice at this one.
  11. doug

    Long Lenses

    Great Egret (Ardea alba) with an unwilling snack
  12. doug

    Long Lenses

    Back in my yard, the birdbath was another source of entertainment (a7rIII, FE 100-400 GM)
  13. doug

    Long Lenses

    Once I was allowed off the property I took the 600mm GM out for some exercise (on a7rIII).
  14. doug

    Long Lenses

    I was quarantined for a few weeks in January so for entertainment I drilled a pocket into a lichen-covered log, stuffed it with yummy treats and waited in my semi-permanent backyard blind for hungry avian visitors. All photos: a7rIII, FE 100-400 GM
  15. doug

    Sony A1 powerhouse

    Reliable bird eye AF + 50MP + low-distortion silent shutter = flat wallet There's a lot of overkill: 30 frames/sec and all the movie stuff is more than I need but it probably won't get in the way. This camera would be very handy, but at this point spending more time in the wild will be more...
  16. doug

    Sony A1 powerhouse

    Bird eye AF. 30 fps. 50MP. This will flatten my wallet.
  17. doug

    Long Lenses

  18. doug

    Long Lenses

    more from the backyard Avian Portrait Studio all: a7rIII, FE 100-400 GM
  19. doug

    Long Lenses

    I made some revisions to my backyard avian portrait studio: the birdbath is now closer to camera level and I've eliminated most of the bright reflections in the water. This cooperative Ruby-crowned Kinglet was my first test subject with the revised birdbath. 03 December 2020 IMBY, Sacramento...
  20. doug

    photokina :(

    https://www.photokina.com
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