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Thread started 29 Nov 2015 (Sunday) 13:27
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Remote focusing question

 
Tom ­ Reichner
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Dec 07, 2015 18:03 |  #16

DoughnutPhoto wrote in post #17804597 (external link)
F/11 at a distance of 400ft. How good is your image if you select infinity focus and then switch to manual focus? I'm not used to these super long focal lengths, but I'd imagine your DOF is big enough.


DoughnutPhoto wrote in post #17804981 (external link)
I was thinking point it at a nice cloud, autofocus and then select manual focus.

You have to be MUCH more precise than that with long focal lengths. 400 feet really isn't very far, when it comes to DOF at 800mm. At only 400 feet, if two eagles are in the same tree, it is very likely that you can take a shot in which one eagle is nice and sharp, and the other is unacceptably soft.


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Sgt.
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Dec 09, 2015 14:20 |  #17

I use live view to focus with the 400 F 5.6 and 2 x converter a lot, it works great.
Couple of examples:

IMAGE: https://farm1.staticflickr.com/553/19653048989_97e5235d96_b.jpg

IMAGE: https://farm6.staticflickr.com/5806/21476883718_1d613168ef_b.jpg

Iain
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dodgyexposure
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Dec 09, 2015 18:00 |  #18

Sgt. wrote in post #17812882 (external link)
I use live view to focus with the 400 F 5.6 and 2 x converter a lot, it works great.
Couple of examples:

QUOTED IMAGE

QUOTED IMAGE

I'm guessing that the deep DOF using f11 at those distances probably helps smooth out any slight misfocusing.


Cheers, Damien

  
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Sgt.
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Dec 10, 2015 00:51 |  #19

Maybe, all I can say is that it works well


Iain
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GregDunn
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Dec 10, 2015 01:47 |  #20

Tom Reichner wrote in post #17810791 (external link)
You have to be MUCH more precise than that with long focal lengths. 400 feet really isn't very far, when it comes to DOF at 800mm. At only 400 feet, if two eagles are in the same tree, it is very likely that you can take a shot in which one eagle is nice and sharp, and the other is unacceptably soft.

This is true for me even at 400mm - two eagles sitting on the same branch are definitely not in the same focal plane every time at f/7.1.


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maxblack
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Dec 10, 2015 11:03 |  #21

Kudos to guntoter, the OP,
for getting that image at 800mm at "1/60" sec.
That's pretty impressive in itself.



  
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guntoter
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Dec 11, 2015 18:43 |  #22

Sgt. wrote in post #17812882 (external link)
I use live view to focus with the 400 F 5.6 and 2 x converter a lot, it works great.
Couple of examples:

QUOTED IMAGE

QUOTED IMAGE

Very nice shots. The 400mm I had was rented to see if I liked it. I do. Lord willing a purchase of this lens is in my future.


Joel
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guntoter
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Dec 11, 2015 18:44 |  #23

maxblack wrote in post #17813952 (external link)
Kudos to guntoter, the OP,
for getting that image at 800mm at "1/60" sec.
That's pretty impressive in itself.

Thank you. I had fun that day.


Joel
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Remote focusing question
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