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Bad Senor or Cheap Bokeh?

  
 
snegron7
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p.1 #1 · p.1 #1 · Bad Senor or Cheap Bokeh?


Testing out my Tamron 28-200mm. Any idea if the distortion around the bird's head is lens or sensor related? Picture # 1 is the uncropped original. Picture # 2 is cropped to show the distortion around the bird's head.

https://flic.kr/p/2pyAeRr

https://flic.kr/p/2pyGWwa


Images were shot with an A7c, Tamron 28-200, f5.6, 1/500, ISO 200.



Feb 17, 2024 at 10:04 AM
snapsy
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p.1 #2 · p.1 #2 · Bad Senor or Cheap Bokeh?


All I see is busy bokeh in the foliage behind the owl, some of which is near the owl's head.


Feb 17, 2024 at 10:13 AM
snegron7
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p.1 #3 · p.1 #3 · Bad Senor or Cheap Bokeh?




snapsy wrote:
All I see is busy bokeh in the foliage behind the owl, some of which is near the owl's head.


It looks wavey and distorted, really unnatural.



Feb 17, 2024 at 10:31 AM
snapsy
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p.1 #4 · p.1 #4 · Bad Senor or Cheap Bokeh?


snegron7 wrote:
It looks wavey and distorted, really unnatural.


It looks the same as the areas of busy bokeh that aren't near the owl's head. It only looks stranger near its head due to the similarity of the color and texture of the foliage to the owl's feathers.



Feb 17, 2024 at 10:50 AM
QuietOC
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p.1 #5 · p.1 #5 · Bad Senor or Cheap Bokeh?


The OoF light points have outlined edges. That is a common weakness of Tamron varifocal optical designs. Digital sharpening is probably making it look worse here. You might try getting rid of that. I am sure this could be cleaned up in post with recent editors.


Feb 17, 2024 at 12:40 PM
Imagemaster
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p.1 #6 · p.1 #6 · Bad Senor or Cheap Bokeh?


How about excessive cropping? Use 'Surface Blur' or some other post-processing blur to smooth it out


Feb 17, 2024 at 02:15 PM
snegron7
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p.1 #7 · p.1 #7 · Bad Senor or Cheap Bokeh?




Imagemaster wrote:
How about excessive cropping? Use 'Surface Blur' or some other post-processing blur to smooth it out


The reason for "excessive cropping" was to show a sample of the wierd bokeh I was seeing throughout the image. It's mostly noticeable around the owl's head. There was no post processing work done on this image at all other than cropping a portion to show the weird bokeh issue.



Feb 17, 2024 at 02:52 PM
timgangloff
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p.1 #8 · p.1 #8 · Bad Senor or Cheap Bokeh?


heat waves?



Feb 17, 2024 at 02:55 PM
davev
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p.1 #9 · p.1 #9 · Bad Senor or Cheap Bokeh?


Wrong lens and composition for this type of photo, and probably heat waves.


Feb 17, 2024 at 03:08 PM
 


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snegron7
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p.1 #10 · p.1 #10 · Bad Senor or Cheap Bokeh?




timgangloff wrote:
heat waves?


Looks very similar to heat waves, but I was pretty close to the owl and the temperature was only in the upper 60's. On other parts of the image the bokeh looks like tiny donuts.



Feb 17, 2024 at 03:11 PM
Imagemaster
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p.1 #11 · p.1 #11 · Bad Senor or Cheap Bokeh?


snegron7 wrote:
The reason for "excessive cropping" was to show a sample of the wierd bokeh I was seeing throughout the image. It's mostly noticeable around the owl's head. There was no post processing work done on this image at all other than cropping a portion to show the weird bokeh issue.


You have missed my point. You are noticing the weird bokeh more because you are looking at it magnified (same as cropped). It is no different close to the owl's head than it is in the rest of the background. It is a result of the lens you are using, distance of background from subject, and f-stop.

Want to not get it? Buy a more expensive lens, don't have a busy background close to subject, shoot with a f2.8 lens, etc., etc.
Want to make it less detracting in existing image? Fix it, remove it, or smooth it out in post-processing.

Unlikely it is heat waves.

Googling 'bokeh' will bring up all sorts of examples of bokeh, why it occurs in different degrees, and how to deal with it.



Feb 17, 2024 at 03:23 PM
Imagemaster
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p.1 #12 · p.1 #12 · Bad Senor or Cheap Bokeh?


snegron7 wrote:
Looks very similar to heat waves, but I was pretty close to the owl and the temperature was only in the upper 60's. On other parts of the image the bokeh looks like tiny donuts.


Heat waves would have effected whole image. It is temperature difference that creates heat waves, not temperature alone. You can get heat waves just as strong at temperatures below freezing.



Feb 17, 2024 at 03:26 PM
Imagemaster
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p.1 #13 · p.1 #13 · Bad Senor or Cheap Bokeh?


Heat shimmer in cold weather:

https://fstoppers.com/landscapes/cold-weather-gear-might-forget-about-650542

https://www.moosepeterson.com/blog/winter-heat-shimmer/



Feb 17, 2024 at 03:32 PM
InFocus2014
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p.1 #14 · p.1 #14 · Bad Senor or Cheap Bokeh?


Imagemaster wrote:
You have missed my point. You are noticing the weird bokeh more because you are looking at it magnified (same as cropped). It is no different close to the owl's head than it is in the rest of the background. It is a result of the lens you are using, distance of background from subject, and f-stop.

Want to not get it? Buy a more expensive lens, don't have a busy background close to subject, shoot with a f2.8 lens, etc., etc.
Want to make it less detracting in existing image? Fix it, remove it, or smooth it out in post-processing.

Unlikely
...Show more

I completely agree with Imagemaster. I have this lens, although I rarely use it due to the slow aperture at longer FL's. The owl is so close to the busy background (at the high angle that it is shot) that even faster, more expensive zoom lenses would likely not render his scene particularly well.

I you are open to suggestions, the shot might have been more pleasing to you if you had placed the camera near the ground (at bird level) to gain effective separation from the background. The tall grass, as the dominant, mostly monochromatic, background also might have been an improvement.

Also, professional wildlife photographers all seem to emphasize shooting at the same level as the bird. I am rarely happy with my bird photo's if I am either shooting down, or even up, at the bird(s). Finally, having a pleasing background can be 90% of the shot desirability when shooting birds. If my bird shots have a distracting background due to either color or textures, I either delete the shot, soften or reduce background contrast in PP, alter the hue or just replace it, altogether.



Feb 17, 2024 at 04:13 PM
snegron7
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p.1 #15 · p.1 #15 · Bad Senor or Cheap Bokeh?




InFocus2014 wrote:
I completely agree with Imagemaster. I have this lens, although I rarely use it due to the slow aperture at longer FL's. The owl is so close to the busy background (at the high angle that it is shot) that even faster, more expensive zoom lenses would likely not render his scene particularly well.

I you are open to suggestions, the shot might have been more pleasing to you if you had placed the camera near the ground (at bird level) to gain effective separation from the background. The tall grass, as the dominant, mostly monochromatic, background also might have been
...Show more


Thanks for the feedback!

Only reason I used that lens/camera combo this morning was because I wanted to test my relatively new Tamron 28-200mm. The owl was the only subject near my house, so I shot the picture from my car on the side of the road. Definitely not intended to be a "post-worthy" picture! 😀 If I really wanted to take a better image I would have shot it with my R6 and 300mm f4.0L. This test today was just to get a feel for the Tamron 28-200mm for an upcoming trip. I was simply concerned with the weird bokeh since I've never run into this before.



Feb 17, 2024 at 06:08 PM
NJPhotographer
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p.1 #16 · p.1 #16 · Bad Senor or Cheap Bokeh?


It's not the sensor. It's shot at f/5.6. Perhaps you are oversharpening the image?


Feb 17, 2024 at 06:24 PM
snegron7
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p.1 #17 · p.1 #17 · Bad Senor or Cheap Bokeh?




NJPhotographer wrote:
It's not the sensor. It's shot at f/5.6. Perhaps you are oversharpening the image?


Unfortunately at 200mm, the fastest aperture is f5.6 for that lens.



Feb 17, 2024 at 06:41 PM
Grenache
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p.1 #18 · p.1 #18 · Bad Senor or Cheap Bokeh?


Firstly, you missed focus on the eye by about six inches. The sharpest part in the image is the leaf / weed a few inches closer than the bird and in the sand. The head looks imperfect due in part to that.

The background is busy, but that is accentuated by trying to sharpen an out of focus image.

There is a particularly sharp weed or something just to the left of its head but still looking like it is touching the head. Hard to know for sure, but that might be diffraction (from the narrow spacing of the weeds coincidentally adjacent to the subject - not your sensor). That sort of thing is more common when shooting through pine needles but can happen unpredictably with other objects.

Jim



Feb 18, 2024 at 01:27 PM







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