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By Relic01  
the idea was to get a crisper image of a single bubble.
there was a flash on full (Nikon SB-900) camera left with a snoot. level with the glass and bubbles.
I used a flashlight shone on the bubble to focus, need something better I think.
I am asking if I should up the ISO more than 400?
The glass is full of smaller bubbles but I dont think that accounts for it not being sharp.
Thoughts, advice?

Tags: Still life Bubbles Lighting Trials Experiment

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Merlin_k Plus
11 39 13 United States
21 May 2019 12:27AM
My guess, and it really is a guess, is that this is more of a depth of field issue. At least when I have tried similar. The rapidly curving surface means there is a very specific focal point and everything else falls outside of that. With an aperture of f10 I think itís asking a lot.

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Relic01 8 8 Canada
21 May 2019 1:17AM
Merlin I think you are correct. I used my old 55-200 on a whim, perhaps I will use my 50 at 1.8 and manual focus. Would you advise the focal point on the top edge of the bubble?
dudler Plus
16 1.1k 1605 England
21 May 2019 8:43AM
Definitely a focus issue: although at close distances the DoF will be limited, the key is to decide where you want sharp focus, and make sure that you get it. Manual focus often makes sense for closeups, as the AF focus points may not be where the crucial part of the subject is.

A tripod is essential, and it really helps to have good light for focussing accurately: lock everything down carefully!

A focus rack, to allow you to move the caemra backwards and forewards to focus can make things easier: it really is an easier way to focus close up.

And a macro lens has a lot to offer - see my setup HERE , or paulbroad's HERE. I will note that I occasionally dabble, and that Paul is particularly good at macro work. As the difference in the quality of rour work shows, practice also contributes to success.
banehawi Plus
15 2.2k 4096 Canada
21 May 2019 10:05AM
Did you set the camera to manual focus only for the shot, after you obtained focus originally?

If not, this will happen.
paulbroad 12 131 1288 United Kingdom
21 May 2019 5:41PM
As above. you must be able to see the problems here for yourself, so far out of focus as to be unusable. You will not get enough depth of field for this, nor will focus stacking work on an unstable subject.


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