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Mineral PhotographyISO setting for minerals
24th Oct 2014 16:22 UTCHoward Heitner
I am usually using daylight from a skylight and some daylight fluorescent bulbs for lighting.
Any advice on choosing the best setting?
24th Oct 2014 17:52 UTCEugene & Sharon Cisneros Expert
24th Oct 2014 23:15 UTCOwen Melfyn Lewis
What is ample illumination at, say, x20 mag, often leaves one screaming for more light if one raises to magnification to, say, x160. As a rule of thumb, magnification above x40 causes subjects to start to dim noticably to the eye as opening of the pupil can no longer fully compensate. Raising the ISO setting of the camera sensor plate is one way of coping in photography. Another is to increase the light flux - but that usually requires a different and stronger light source.
24th Oct 2014 23:36 UTCRonald J. Pellar Expert
Owen,
The illumination is proportional to the inverse square of the linear magnification, i.e., increasing linear magnification by x2 decreases the illumination by 1/4.
25th Oct 2014 00:35 UTCOwen Melfyn Lewis
Have it your way and quadruple the magnification and the illumination is reduced only 'by 1/16' (i.e. negligible, as 15/16ths then remains) - and the higher the one takes the mag the the more vanishingly small the diminution of illumination will become - a nonsense as all microscopists know.
I know, I know.... it's all to do with the rules of language that some insist do not exist in English. But grammar rules OK? :)-D This is a fair example of where a grammar rule is critical to meaning. Sorry to drag this in here but it's a good example.
25th Oct 2014 01:09 UTCHoward Heitner
25th Oct 2014 02:09 UTCEugene & Sharon Cisneros Expert
26th Oct 2014 00:53 UTCOwen Melfyn Lewis
-------------------------------------------------------
> I did two test shots with all the other settings
> the same, with ISO on auto and 200. After some
> very slight tweaking of brightness and color
> temperature, they looked the same.
Why did you not also try the ISO 400 and 800 settings, to see for yourself what any difference might be?
26th Oct 2014 02:40 UTCEugene & Sharon Cisneros Expert
-------------------------------------------------------
> I did two test shots with all the other settings
> the same, with ISO on auto and 200. After some
> very slight tweaking of brightness and color
> temperature, they looked the same.
I suspect that is because you have sufficient light and the auto mode was setting ISO to some low value. For educational purposes, you can try reducing the light and set ISO to auto and you should see what a noisy image looks like.
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Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: April 25, 2024 23:05:48