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Member Since 22 Apr 2011
Offline Last Active Mar 31 2018 11:55 AM

#353067 Sola 500 Battery pack

Posted by bobanderson on 29 September 2014 - 11:34 AM

Thanks for the cleaning the contacts trick, I tried that too.


Sadly I think it is definitely the batteries as there seems to be acid in the torch and a bit of a smell.





#337866 Strobe "Shutter speed"

Posted by bobanderson on 07 October 2013 - 01:01 PM

if I took a picture of a hummingbird, I could freeze the wings with a fast shutter speed. I believe I could do the same thing with a flash too? How would I work out the timings bar small light output, more freeze, large output less freeze?

#337824 Strobe "Shutter speed"

Posted by bobanderson on 06 October 2013 - 11:43 AM

I am having problems understanding this picture of the tentacles of a common urchin. Now, its not the best picture in the world so I'm not looking for critique but rather for help with the technicalities.




It is taken on a D200 and 60mm with a 36(?I think)mm extension tube. It is a 1 sec exposure at f32 at 100iso.


I shot f32 to get dof. I shot 100 to get best quality. I shot 1 sec to get green background.


The strobe (both) was a subtronic with dial set to 4 (1/4?) and as the tentacles were moving, it has done quite a good job of "freezing the action" and giving me sharp tentacles (things that are in focus are not blurred, ya catcha ma drift?)


My understaning is that one can use strobes as a shutter to freeze action: what are the numbers here? ie at full splat, how long is the light lit in shutter speed terms? is there an equivalency or is it just super fast? How far can you go in freezing stuff that is really small? What use is this idea in a wider context?


I guess I am just asking for help with the situation: if anyone could point me in the right direction, I would be chuffed to bits.


Many thanks