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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 17 Dec 2014 (Wednesday) 10:12
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EF 100-400mm f/4.5-5.6L IS II USM Review WOW!

 
sploo
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Jun 10, 2017 10:44 |  #6091

LonelyBoy wrote in post #18375201 (external link)
So, dumb question... why does it say "focus distance between 81.91m and 559.79m"? Doesn't it know much more precisely than that what distance the lens is focused at?

Pondrader wrote in post #18375206 (external link)
Thats a good question.

The metadata in the file isn't very specific with focus distances (at least for larger values anyway). Some years ago I had an idea to write an image processing application that used the focus distance but found that the data just wasn't accurate enough for the job.

I don't know if the camera actually knows what the focus distance is. Part of me suspects it's just changing focus on the lens until it gets the image sharp (or rather "aligned", for phase AF).


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LonelyBoy
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Jun 10, 2017 12:47 |  #6092

graham121 wrote in post #18375214 (external link)
Maybe it ( it being the camera / lens ) does know the exact distance that relates to the position the lens has moved to achieve focus, but it does not release that data to the interface that stores the data the plug in reads.

Just like focus assist points that may or may not be in use, or the apparent activation points that do not appear to be in the plane of focus, I am pretty sure that some of the information shown in the plugin is a result of interpretation and not the actual data coming from the camera.

Well sure, but if DPP can only tell you the focal distance give or take a couple of football fields, at a range of a couple of football fields, why even include the information in the display?


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Jun 10, 2017 12:54 |  #6093

LonelyBoy wrote in post #18375201 (external link)
So, dumb question... why does it say "focus distance between 81.91m and 559.79m"? Doesn't it know much more precisely than that what distance the lens is focused at?

Ok. So wouldn't that change with the F stop.. Now I have to go out and run some experiments.

Mike


Mike...G9; 7D; 7D Mark II; EF-S 10-22mm; EF-S 18-135mm IS STM; EF 28-300mm F3.5-5.6L; EF 70-300mm IS USM; EF 70-200mm F2.8L IS-II; EF 100-400mm f4.5-5.6L IS; EXT 1.4-II & 2.0-III; The more I learn the less I know.

  
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Pondrader
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Jun 10, 2017 13:18 |  #6094

Its good to see some sharp mind's at work lol


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MatthewK
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Jun 10, 2017 14:34 |  #6095

I'm heading to the US Virgin Islands next week, and am heavily considering taking this lens (along with my usual 16-35 f/4 and 50L). Probably won't because it'll be super heavy, but if there's a chance of nice wildlife opportunities, I'm willing to shoulder the burden (pun intended). Anyone been to USVI and can comment on whether it's worth taking this lens?


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Pondrader
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Jun 10, 2017 15:37 |  #6096

MatthewK wrote in post #18375416 (external link)
I'm heading to the US Virgin Islands next week, and am heavily considering taking this lens (along with my usual 16-35 f/4 and 50L). Probably won't because it'll be super heavy, but if there's a chance of nice wildlife opportunities, I'm willing to shoulder the burden (pun intended). Anyone been to USVI and can comment on whether it's worth taking this lens?

I take mine just getting grocery's soooooooooo


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Jun 10, 2017 16:32 |  #6097

Got her in the nest.


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docg
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Jun 10, 2017 17:32 |  #6098

GAJoe wrote in post #18375485 (external link)
Got her in the nest.

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forum: Canon EF and EF-S Lenses

Great capture. Still hoping to see pics of the babies.


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johnf3f
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Jun 10, 2017 17:49 |  #6099

Pondrader wrote in post #18374956 (external link)
Its all a pipe dream John, If they make it I will not be able to afford it anyway. stuck with the 100-400L lol. 65 meter's
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forum: Canon EF and EF-S Lenses

Pity.

I am using the Canon 800mm, as you know, but I am not into pipe dreams hence I bought it! For reference, when I bought it, my income was about Can$1100 a month - yes read that again! True my 800mm was second hand but if you really want it you can have it:twisted:


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sploo
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Jun 10, 2017 17:51 |  #6100

MikeWa wrote in post #18375354 (external link)
Ok. So wouldn't that change with the F stop.. Now I have to go out and run some experiments.

Mike

The f-stop will affect the depth of field, but wouldn't change the focal plane. Well, apart from on lenses where it does ;-)a (some lenses exhibit minor focus shift on stopping down: https://photographylif​e.com/what-is-focus-shift/ (external link))


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LonelyBoy
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Jun 10, 2017 17:55 |  #6101

sploo wrote in post #18375537 (external link)
The f-stop will affect the depth of field, but wouldn't change the focal plane. Well, apart from on lenses where it does ;-)a (some lenses exhibit minor focus shift on stopping down: https://photographylif​e.com/what-is-focus-shift/ (external link))

What, is this the EF 50 f/1.2L USM Review WOW! thread?


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smythie
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Jun 10, 2017 19:11 |  #6102

Pondrader wrote in post #18375455 (external link)
I take mine just getting grocery's soooooooooo

skite


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Pondrader
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Jun 10, 2017 20:10 |  #6103

johnf3f wrote in post #18375536 (external link)
Pity.

I am using the Canon 800mm, as you know, but I am not into pipe dreams hence I bought it! For reference, when I bought it, my income was about Can$1100 a month - yes read that again! True my 800mm was second hand but if you really want it you can have it:twisted:

true John, There was a time I would simply go get what I wanted. Now I have a dozen other people ( kids grand children ) and 200 other reason's that need it now.

All three cub's accounted for tonight.


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Jun 10, 2017 20:24 |  #6104

Think Mommy would mind if I hugged them and buried my face in their fur?


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Jun 10, 2017 21:11 |  #6105

LonelyBoy wrote in post #18375604 (external link)
Think Mommy would mind if I hugged them and buried my face in their fur?

ya I know yeah,... I need to find a way to get closer


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EF 100-400mm f/4.5-5.6L IS II USM Review WOW!
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