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pcr1040

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pcr1040 last won the day on January 19 2020

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  1. Sony Sony 100-400 GM Lens Problem Well, I did get to the bottom of this issue with my Sony 100-400 GM lens. After much testing and consulting with my local Camera Store, we concluded that the lens alignment seemed off and needed repair. It went to Sony for repair. And the repair turned out to be an expensive repair. I got it back from the Sony Repair facility yesterday and tried out on a target on which I originally noticed the optical defect. And yes, it is improved, BUT not eliminated. Please see the attached image showing three shots of the same light post. The left side is s
  2. Pieter Did you ever read something then smack yourself in the head and say to your self "DUMMY"? Well after reading your concise and clear response to my dumb question, I did just that. I got hung up on pixel density and forgot about pixel size. Thank you for your excellent response. But I still deserve the title "Dummy" Paul
  3. I have been shooting with a M43 camera that yiels a 20mgpxl raw file. I recently acquired a Sony A7R3 and I thought the file s size for APS-C would be about hte same size as the full frame M43 size image file. What I find is that the Sony APS-C images are significantly smaller than the M43 images. for example, my G9 camera yields a image file of 5184x3888 or 20.15 mgpxl The A7R3 in APS-c mode yields a file size of 5168x3448 or 17.8 mgpxl. What I do not understand is how 1/2 of a ff sensor that is 40+mgpxl can yield an image that is so much smaller than the M43 size image when the m43 is
  4. Over the last year of so, I have begun to notice an odd shadow like edge to the subject of my image along the left side. It is only apparent when I increase the magnification to 150-200%. I have attempted to isolate the cause by trying my lens on another camera body (A7R3) and what I find is the same shadow appears but now is on the right side of the subject in focus. I tried turning IBIS off and and turn off auto focus, and still get the problem. I believe it is a Lens issue, not a camera issue so I had my dealer send the lens to Sony for a repair estimate. My reason for posting this issue is
  5. A number of questions have been raised about the image I started this line of inquiry with. Am I shooting Jpg or Raw? Could the EFCS be the issue? Could the issue be due to the contrast difference between the subject and background? and so on. So let me add yet two image showing the same problem with different backgrounds. Please see the following images. Notice the shadowing around the left side of the subject's head. Originally shot in RAW converted in Affinity Photo to a jpg and cropped. The raw image shows this "shadowing, just like the jpgs attached. I also shoot with a different
  6. Thanks for responding. I never shoot compressed RAW. All of my images are RAW and are full 80mgb. Thanks for the reference on the EFC shutter. I am not sure it relates to the issue I have. The shadow is on one side of the hawk and not top of the image. Paul
  7. Indeed it is helpful. I will review the article referenced later today. I understand that jpeg compression is a lossy compression and can lead to artifacts like the kind I found in my image. But keep in mind that the image had the issue, was a RAW image file, not jpeg. I had to make a reduced size jpeg in order to send it to the Forum. I am wondering if my lens has an issue that needs to be corrected? Oddly enough, on most images, I seem to be fine with the level of sharpness I am getting with this lens.
  8. I am away from my iMac that has the original image, but my recollection is that the image was taken at somewhere above 1/1000 of a second and set on EFC. Usually while walking in the field the camera is set on C2 (BIF) and the base shutter speed is 1/1500. I seldom reduce it below 1/1000. P
  9. I understood the EFC was used primarily to mitigate shutter shock when shooting at slower speeds. Like you, I use it as my default setting no matter how high I set the shutter
  10. I thought I responded earlier to your thoughtful comment. I guess I did not send it. So let me try to re state it here. The image was a jpg, but, the I typically shoot only RAW, and the unedited RAW image file has the same shadow on the left side of the Hawk, and it can be seen in some of the branches as well. I am new to shooting wih the Sony System. Formerly I shot wit a Panasonic G9 and a Panasonic lens 100-400mm lens. I don't recall seeing such shadowing on similar shots of wildlife taken with the Panasonic system.. You also commented on the "sharpest transition in intensity"
  11. I shoot with a Sony a7R3 and the 100-400m m Sony GM lens. While I am generally satisfied wit the lens performance, i noticed on some images I am getting a shading along the image as if it is out of focus or is astigmatic. I have attached one of these images reduced in size and cropped. Please look at the left side of the Hawk's body and bring the image up insize on screen and you will see the shadow like area following the contour of the left side of the bird's body. Any thoughts about his would be appreciated.
  12. Issue resolved. I got into the sub menus and somehow, I changed something and now it is working. Unfortunately, I did nt keep track of the changes I made and so, while it is working, I cannot be sure what I did to fix it. That speakes to the issue fo rht complexity of menus and the ambiguity of how they are labled. Thanks again for all who tried to help me.
  13. Poly I set the camera up as you suggested and I now have a button assigned to spot focus (AF-ON). And the Back focus button is assigned to AEL button. That is to give me a choice of Wide focus (AEL) and Spot Focus (AF-ON). Only problem is the AF-ON button will not permit me to change the F stop and the shutter speed varies as a function of the light (Aperture Priority ???). The current setting is F8.0 and and no matter how I set Mode (P, A, S, M) when I push the button for Spot focus, the f is set to F8.0 and the camera is in apparently Aperture Mode. Another issue is that I cannot t
  14. Thanks to both responders. I guess I read the information about Back Focus Adjustment as you guys did. So I am inclined to think the issue is really an issue with this lens. It seems to sharpen up at 300mm when I stop down to f8.0, But even then it's really not as crisp as I would like. In truth I think this is a design issue for most long zoom lenses. They all seem sharpest at the shortest focal length. My other system is a Panasonic G9 with the 100-400mm lens and it too is sharpest at the shorter FL. However, even at 400, it seem sharper than this Sony lens at 300mm.
  15. JCC, thanks for responding to my inquiry concerning qmycamera and focusing it. After reading your comment I went to the Sony site and looked up their page on Front andBack focus adjustment. After reading it, I think they are referring to NON- Sony lenses. I s this also an issue with Sony Glass? All my lenses are Sony manufactured, and one of concern is the Sony 70-300 G OSS. When I look at the camera and the "Micro Adjustment" item in the menu, it is ON, but if I then select lens, it reports "Invalid with this Lens" So, I am at a loss as to what this all means.
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