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SD1100 IS: an inverted microscope eyepiece as a macro attachment

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Offline lngndvs

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SD1100 IS: an inverted microscope eyepiece as a macro attachment
« on: 29 / July / 2012, 04:28:03 »
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I fitted a microscope eyepiece to the extended inner barrel of the lens of this camera, as a macro attachment, as described briefly in my blog sandscrawls.wordpress.com.   
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Offline waterwingz

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Re: SD1100 IS: an inverted microscope eyepiece as a macro attachment
« Reply #1 on: 29 / July / 2012, 08:42:44 »
Nice.  I took the liberty of scraping one of the photos for others to see without have to cut & paste the link you posted.

clickable link : http://sandscrawls.wordpress.com

« Last Edit: 29 / July / 2012, 08:48:44 by waterwingz »
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Offline lngndvs

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Re: SD1100 IS: an inverted microscope eyepiece as a macro attachment
« Reply #2 on: 31 / July / 2012, 00:34:13 »
Thanks, Waterwingz!

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Offline Microfunguy

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Re: SD1100 IS: an inverted microscope eyepiece as a macro attachment
« Reply #3 on: 31 / July / 2012, 05:08:34 »
You say "set a custom ISO, such as 12 or 16, if the light is too intense."

Do you have any tests that prove such an ISO value is actually different from the cameras normal lowest value ?
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Offline lngndvs

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Re: SD1100 IS: an inverted microscope eyepiece as a macro attachment
« Reply #4 on: 06 / August / 2012, 17:16:21 »
It's tricky, but I have seen a difference, for example in the exif metadata.   However, I have had trouble with this, even between successive shots.   One possibliity is to check the parameters of CHDK related to autoiso. 

I have consternated and experimented numerous times.  Several settings seem to interact in ways that are not obvious to me.   For example, just setting over- and under- exposure seems to make a difference in some configurations; while at the same time, it affects the brightness of the LCD.   

If there is a lucid account of how to set these parameters, I would also appreciate to learn more about it.

Alan
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Offline lngndvs

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Re: SD1100 IS: an inverted microscope eyepiece as a macro attachment
« Reply #5 on: 06 / August / 2012, 17:31:51 »
Microfunguy:


However, on the page of camera features at chdk.wikia.com/wiki/CameraFeatures , a note is made of the lowest and highest  ISOs, as
"50 {80} / 6400 (1600) ".  So I guess 50 is stated to be possible.

However, I have a photo that shows "ISO Speed Rating" as 10 in the exif data.   Is this accurately reported, or does this happen even if the hardware overrides the software setting by CHDK?

How can I post the photo? 

Alan


 

Alan
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Offline lngndvs

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Re: SD1100 IS: an inverted microscope eyepiece as a macro attachment
« Reply #6 on: 06 / August / 2012, 17:36:29 »
With apologies, I will post once more.  The "Makernote" metadata as displayed by Digikam (GNU/Linux) shows "ISO Speed Used" as 100., under the subheading of "CanonSi" 

So, until I figure out how to set this camera reliably, I cannot verify there is any effect of setting the ISO to 10 or 20, or whatever.

Alan

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Offline lngndvs

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Re: SD1100 IS: an inverted microscope eyepiece as a macro attachment
« Reply #7 on: 06 / August / 2012, 17:51:57 »
 I will try to post the photo on Google+ in the album August 6, 2012

https://lh4.googleusercontent.com/-JeLyAji0t08/UCA750ChliE/AAAAAAAAAZ0/_IpG9_Je1oQ/s265-c/August62012
 
It might be available here.

Alan
« Last Edit: 06 / August / 2012, 17:56:02 by lngndvs »
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