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DrJohn last won the day on October 13 2018

DrJohn had the most liked content!

About DrJohn

  • Rank
    Advanced Member
  • Birthday 08/27/1948

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  • Location
    Northport, NY
  • Interests
    Medicine, Physics, Astronomy, Photography

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  1. DrJohn

    Solar Imaging

    Sure I considered it. But, I don't have the energy any longer to climb. I'm still dealing with the after affects of Lyme disease. John
  2. DrJohn

    Makamah Nature Preserve - Fall

    I was hanging from a cliff to get this shot and holding the camera as low as possible to see through the bushes. There was only a small opening in the bushes. No processing done. John
  3. Makamah Nature Preserve - Northport, NY. October 31, 2018 Sony A7RIII, Sony 28-70 mm lens at 28 mm.
  4. DrJohn

    Swan with 100-400 mm

    Sony A7RIII, Sigma 100-400 mm lens with MC-11 adapter at 400mm
  5. I'm a convert from Nikon so I'm not used to the Sony A7RIII. My thumb keeps accidentally touching the exposure compensation dial and messing up my exposure. Is there a way to disable the exposure compensation dial? John
  6. There are more focal lengths shown on this post: John
  7. This posting belongs to the lens forum and the wildlife forum. I posted it on the lens forum. It may be helpful when selecting a lens for bird photography. John
  8. http://drjohnphotography.com/papers/70mm-600mm-FF-40-Feet-Med-Res.pdf This article compares the various focal lengths at 40 feet. John
  9. 1971. Nikon F. 35 mm camera. Kodak Kodacolor 125 Film. Montauk, NY I don't remember the settings. It was scanned from a 3.5 x 5 print at 180 dpi about 30 years ago. John
  10. http://drjohnphotography.com/papers/Backyard-Bird-Photography-Med-Res.pdf John
  11. This was taken with the A7RIII and the 70-300 mm lens. Distance: 40 feet, handheld Focal Length: 300 mm Aperture: f/8 Shutter Speed: 1/320 ISO: 1600
  12. DrJohn

    Storm over the Lake

    It was finally sunny at my home in Northport after many days of rain and clouds. I traveled to a lake to photograph it with my new 16-35 mm FE lens at 16 mm. When I got there, it was cloudy. I took the shot anyway. (Sony A7RIII, 16-35 mm FE lens at 16 mm, f/8, 1/640 sec, ISO 100) John
  13. That is why I said about 95 mb. The size depends upon how much information is contained in the photograph. John I'm also a convert from Nikon. I don't have an answer to your question. John
  14. DrJohn

    Auto ISO Opinions Wanted

    I ask because I'm curious. I never use auto ISO. But then, I'm used to the film era... We had three adjustments: focus, shutter speed, and aperture. To change ASA, we had to use a different film. John