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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 15 Sep 2014 (Monday) 11:20
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-= 7D2 owners unite! Discuss and post photos!

 
BuckSkin
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Nov 14, 2021 06:08 |  #22921

Lame-Duck wrote in post #19081995 (external link)
Here is a quick and easy test to determine if a serious micro adjustment test is required. I set these 5 AA batteries about 2 inches apart, shot them with my 1DX II (100-400 mm Canon zoom lens) at about a 45 degree angle, with the aperture wide open. I focused on the center (X) battery. From this photo, it appears as though I took the photo straight on, but I did not. Like I mentioned, it was shot at approximately a 45 degree angle. Notice that the X battery does appear to be the sharpest sharpest of the five. Those batteries to the left and the right (front and back) of the center are equally out of focus. This quick test immediately tells me that that I am not having front or back focusing issues, and it's not necessary to do an elaborate micro adjusting test.

Concerning this AA battery focusing test, how far away from the batteries should the camera be ? or is it dependent on the focal length of the lens ? and if that be the case, is there a chart depicting the distances per focal lengths ?




  
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RodS57
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Nov 14, 2021 08:48 |  #22922

BuckSkin wrote in post #19307032 (external link)
Concerning this AA battery focusing test, how far away from the batteries should the camera be ? or is it dependent on the focal length of the lens ? and if that be the case, is there a chart depicting the distances per focal lengths ?

Your trying to open a can of worms. I think the typical recommendation is to test at or near your normal shooting distance for the focal length you are using. I've used 50x focal length or as close as I can get to that value.
IMO small targets with fine details at distance become more a test of lens / camera resolving power than a focus test.
It is generally accepted that the little box you see in the view finder is only an approximation of the focus point position. Make sure your subject is larger than the little box.

I found cereal boxes worked well. The side with the nutritional values always had nice sharp black text. I used to set up three boxes two inches apart offset two inches front to back.

FYI there is a thread of several hundred pages in this forum dedicated to 7D2 focus issues. No doubt it has answers to questions you haven't thought of yet. :-)

Rod


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David_MC
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Nov 14, 2021 10:38 |  #22923

Bald Cypress Trees at Trap Pond, DE

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(DUPLICATE IMAGE)

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BuckSkin
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Nov 15, 2021 14:25 |  #22924

RodS57 wrote in post #19307075 (external link)
FYI there is a thread of several hundred pages in this forum dedicated to 7D2 focus issues. No doubt it has answers to questions you haven't thought of yet. :-)

Rod

Thanks; I will seek it out and give it a look.




  
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Bobster
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Nov 15, 2021 18:01 |  #22925

BuckSkin wrote in post #19307648 (external link)
Thanks; I will seek it out and give it a look.

https://www.reikanfoca​l.com/focal-pro.html (external link)
I calibrated with every season change (major temp changes) kept my camera and lenses in check :)


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jimmy_racoon
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Nov 28, 2021 15:29 |  #22926

dead of winter

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Cooltigers
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Dec 14, 2021 07:54 |  #22927

KASHMIR ,INDIA


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Cooltigers
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Dec 14, 2021 07:56 |  #22928

KASHMIR ,PAHALGAM


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David_MC
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Dec 28, 2021 14:40 |  #22929

Wichita Mountains, Oklahoma.


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jimmy_racoon
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Dec 29, 2021 13:48 |  #22930

frozen cattail

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jimmy_racoon
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Dec 29, 2021 13:49 |  #22931

frozen burrs

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RodS57
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Jan 02, 2022 17:54 |  #22932

I don't venture too far in the winter these days. I put thousands of miles on the vehicle I used to own driving out the highway in winter time looking for ptarmigan in particular but any wildlife would do. Basically wore the truck out. For various reasons I don't do that any more. Dec 29 was my lucky day. I stopped at my usual bird watching spot, half a mile from home and happened to see ten ptarmigan. Here are a couple of shots from that encounter.

Rod


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avondale87
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Jan 02, 2022 17:59 as a reply to  @ RodS57's post |  #22933

Beautiful birds.
Lovely photos
I'd find that quite exciting.
Thanks for posting. Not sure if I've seen one on this site for a long time



Richard

  
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RodS57
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Jan 02, 2022 19:50 |  #22934

avondale87 wrote in post #19325546 (external link)
Beautiful birds.
Lovely photos
I'd find that quite exciting.
Thanks for posting. Not sure if I've seen one on this site for a long time

Thank you.

Yes, they are beautiful birds. They spend a lot of time on the ground foraging for food. The birds pictured were about 30 feet away, sometimes walking closer to me. Hoping to see more. Heavy overcast that day so the pics seem a bit dull but I can't control the weather.

Rod


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RodS57
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Jan 08, 2022 12:48 |  #22935

One more ptarmigan shot. I've gone from dull overcast to harsh side lighting with the resulting blown highlights. Still wanted to post for people that don't get the chance to see these birds. This was a very minor crop.

I had already spotted the group of birds but I had to stop so this one could walk across the road after which he politely sat on top of the snowbank so I could take his picture.

Rod


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