• Welcome to BirdForum, the internet's largest birding community with thousands of members from all over the world. The forums are dedicated to wild birds, birding, binoculars and equipment and all that goes with it.

    Please register for an account to take part in the discussions in the forum, post your pictures in the gallery and more.
ZEISS DTI thermal imaging cameras. For more discoveries at night, and during the day.

Search results

thxpress_search_the_forum Search Opus
  1. M

    Sony A9 vs Sony A7R mk IV

    A recent post on diglloyd.com [1] sums up the diffraction issue. While f/8 clearly degrades the image on the A7RIV (and the phase one he's talking about), other factors like field curvature or focus shift [2] dominate so he's OK goin a bit sub-optimal. I suspect it would be the same thing with...
  2. M

    Sony A9 vs Sony A7R mk IV

    Yes, now you are getting at the crux of the matter. If you are shooting near-full-frame images and then reducing them to 10-15MP prints, the A7RIV is going to give you better results and you will not see the issues with the A7RIV being affected by more diffraction. Basically, the 2.5x more...
  3. M

    Sony A9 vs Sony A7R mk IV

    I am simply trying to answer the question, for constant image quality (which I defined as 10MP or 5MP), what is the maximum reach of the lens? That's it. I was not trying to say one is better than another for that question, just what is the maximum crop of each camera for the same lens and...
  4. M

    Sony A9 vs Sony A7R mk IV

    Stuart -- Let me address these items 1 by 1. They are good points. Note: Below when talking about DoF, I use "sensor size" to mean the MP assuming a fixed physical size. In your post you said sensor size in terms of physical size. I have tried to fix my wording below. 0) High MP overall. I...
  5. M

    Sony A9 vs Sony A7R mk IV

    Stuart, My calculation assumes that you want the image quality of either 10 MP or 5 MP, minimum. I.e., that is the maximum you would want to crop to. So, what's the equivalent focal length at that maximum crop? Usually shooting birds, it's always a question of needing more focal length, so I...
  6. M

    Sony A9 vs Sony A7R mk IV

    Nice review. I like his stuff, usually very practical. Definitely some good results with the 100-400. Now I'm interested to know if he has a bad sample of the 200-600 or if it was just pilot error or what. Marc
  7. M

    Sony A9 vs Sony A7R mk IV

    Lloyd Chambers has his A7RIV and has started his typical highly detailed testing. If you are not a subscriber, you can subscribe to just his Mirrorless section ($99/yr, not auto-renewing). It's worth it for his lens and camera reviews...
  8. M

    Sony A9 vs Sony A7R mk IV

    I'm sure you'll enjoy it! I might be tempted by the A7000 + 200-600. The file size of 61MP scares me. It already takes a long time to process the 42MP from the d850. I'd likely need to upgrade my little Macbook Air to deal with the A7RIV raw files. marc
  9. M

    Sony A9 vs Sony A7R mk IV

    You know, the A7RIII is a perfectly good camera at 42MP, and I know from my d850 experience that can work well for birds and action. The A7RIII will do 76 continuous exposures @ 10FPS (I only get 9FPS on the d850) with raw. from what I understand, it got a big AF boost the last firmware update...
  10. M

    Sony A9 vs Sony A7R mk IV

    The A9 will give you cleaner images and be easier to use because the sensor sites are so large. You'll get better ISO performance and be less vulnerable to shaking blurring the image. You will also be able to use higher f-stops, like f/11 or f/16 without diffraction limits. But, you will be...
Back
Top