Is this camera shake?

[W00DY]

Hi All,

Took this image of my son tonight (just practising some lighting techniques, this was taken with 1 SB800 off camera right)



It is very soft.

taken at 1/200 @ 3.5, ISO - 200

Here is another taken 15sec later with the same settings which is very sharp.



ignore the expressions... he wanted to go to bed but I would not let him until I practised a bit more you can comment on the exposire, lighting if there is anything to say?

What do you think? can you have camera shake with a 85mm lens set at 200sec?

[MattyO]

its out of focus

i presume your pretty close to him with the camera, and any small movements either forward or back once focus is set will cause outta focus shots.

f3.5 at that rnage isn't much to work with

[W00DY]

its out of focus

i presume your pretty close to him with the camera, and any small movements either forward or back once focus is set will cause outta focus shots.

f3.5 at that rnage isn't much to work with

I was fairly close. So maybe I have locked focus and then moved slightly (I was crucked down so maybe I have rocked back or forward.)

Cheers.

Luckily most were in focus (which is why I was surprised about this one), maybe I needed to go to bed

[Mal]

its out of focus

i presume your pretty close to him with the camera, and any small movements either forward or back once focus is set will cause outta focus shots.

f3.5 at that rnage isn't much to work with

I was fairly close. So maybe I have locked focus and then moved slightly (I was crucked down so maybe I have rocked back or forward.)

Cheers.

Luckily most were in focus (which is why I was surprised about this one), maybe I needed to go to bed

Or more than likely your son moved a little to make the image soft.

[gstark]

Andrew,

you were using flash?

The only use of your shutter speed of 1/200 was to open and close the shutter so the flash could go off. The actual length of the exposure time was probably closer to a poofteenth of a second. Maybe 1/20000, perhaps 1/10000 of a second.

What do you think the chances of this being camera shake might be?

Set NX to show you the focus points; tell us what you see.

[W00DY]

Andrew,

you were using flash?

The only use of your shutter speed of 1/200 was to open and close the shutter so the flash could go off. The actual length of the exposure time was probably closer to a poofteenth of a second. Maybe 1/20000, perhaps 1/10000 of a second.

What do you think the chances of this being camera shake might be?

Set NX to show you the focus points; tell us what you see.

I don't have NX installed on my Mac

I think I understand what you are saying though. It was just weird because the other 20 odd I took were all in focus (some at only 2., just this one was so OOF.

[gstark]

I don't have NX installed on my Mac

So???

Install it. I think you have a couple of licenses, but if you don't grab a copy of ViewNX and install that.

[ATJ]

Note that the focus points don't mean a whole lot if you are shooting in AF-S. It will just tell you where it had focus when the camera first acquired it. If you move after focus was acquired with your shutter button half down, it doesn't refocus.

Here's a shot where I didn't move the camera after focus was acquired:


Here's a shot where focus was acquired and then I moved the camera a few centimetres closer to the subject while maintaining the focus point on the same area.


If you are using AF-S and the person you are shooting moves between when focus was acquired and when the shot is actually taken, they may very well be out of focus. Same goes for you if you are hand holding and move - even swaying may have some effect.