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DrJohn last won the day on July 13

DrJohn had the most liked content!

About DrJohn

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  • Birthday 08/27/1948

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    -Northport, NY
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    Medicine, Physics, Astronomy, Photography

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  1. When you look at lenses on the Sony website, you need to filter for e-mount and full frame lenses. Sony lenses I use often are: 24-105 mm and the 100-400 mm with 1.4x or 2.0 teleconverters. I also have the 16-35 mm, 70-300 mm, and 90m mm macro, which I use less often. John
  2. bwana, I have an A7RIII about 4 months old. Shutter count is about 200. I would sell it to get the A7RIV. John
  3. I use the Tenba Solstice Sling 10L with all of the dividers removed. I can fit the Sony A7RIII, the Sony 100-400 mm with the hood open and 2x in it completely assembled and ready to shoot. John
  4. To follow up, I received the Sony 100-400 lens yesterday and took some test shots handheld with the 2x teleconverter just before it rained. It is definitely an incredible lens. It's hard to believe an 800 mm handheld shot can come out so clear. The photo below was not processed in any way except to reduce the file size for the internet. John
  5. One problem with waiting to rent a lens is that it will be winter. The winters get severe in the Northeast. I leaning towards the 100-400 with the 2x and probably with the 1.4x also. I would use the 2x for lunar imaging (from my backyard) and the 1.4x for wildlife if needed. I usually get away with 400 mm. John
  6. I was really excited to hear about the new Sony 200-600 mm lens. But, now I'm not sure that is the best way to go for my needs. I would like some opinions. I like to image the moon. 600 mm x 1.4x = 840 mm. 400 mm x 2.0x = 800 mm. Around 800-1,000 mm works well for imaging the moon. There will be a lot of light lost with 2.0x. However, the moon is very bright and it shouldn't matter. Also, imaging the moon is done on a tripod with manual focus. In the past, I used the Sigma 150-600 mm lens with 1.4x TC and got excellent results. I also like to do nature and wildlife photography. However with advanced age and Lyme disease, I can't carry much in the woods and need a telephoto and a wide angle lens (either 16-35 mm or 24-105 mm). I definitely cannot carry the 200-600 mm lens and a wide angle lens. The 100-400 mm and wide angle lens is pretty much the limit of what I can carry and 400 mm has worked well for nature wildlife photography so far. Currently, I'm carrying the Sony 24-105 mm and Sigma 100-400mm with MC-11. John
  7. My mouth is watering for the new FE 200–600 mm F5.6–6.3 G OSS lens. It is compatible with the Sony teleconverters and sells for $1999. I heard it will be available 8/2/19. More info from Sony: https://www.sony.com/electronics/camera-lenses/sel200600g John
  8. I got this lens yesterday after seeing several people post about it and took a few test shots. It's a great general purpose lens. John
  9. This was taken with a Sony A7RIII and Sigma 100-400 mm at 400 mm. The Swan was approximately 50 feet away? It was shot at f/8, 1/250th second, ISO 200. No post processing. File was reduced in size for the internet. John
  10. I used the Sigma 150-600 mm lens with MC-11 adapter for Sony to image the moon. The image came out ok. But, there was significant cropping. I wanted more focal length. Sigma said I couldn't use the 1.4x or 2.0x teleconverter with this lens and the MC-11 adapter. They gave me the wrong info. You can use the teleconverters. However you will lose the autofocus. If you're imaging the moon, you will use manual focus anyway. I just came across this youtube video using the 150-600 mm with the 2x teleconverter on a Sony A7RII. John John
  11. I'm selling my Sigma 100-400 with MC-11 and Sigma 150-600 mm with MC-11 and getting the Sony 100-400 with 2x. Both Sigma lens are sharp. However, you cannot use a teleconverter with either of them. I want the 800 mm for imaging the moon. http://www.drjohnphotography.com/used.htm John
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