CHDK Forum

Using CHDK => Creative Uses of CHDK => Topic started by: lngndvs on 29 / July / 2012, 04:28:03

Title: SD1100 IS: an inverted microscope eyepiece as a macro attachment
Post by: lngndvs on 29 / July / 2012, 04:28:03

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.   

Title: Re: SD1100 IS: an inverted microscope eyepiece as a macro attachment
Post by: waterwingz 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 (http://sandscrawls.wordpress.com)

(https://chdk.setepontos.com/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FcwiWW.jpg&hash=cbaa91ce574c3980f9396919353c719f)

Title: Re: SD1100 IS: an inverted microscope eyepiece as a macro attachment
Post by: lngndvs on 31 / July / 2012, 00:34:13

Thanks, Waterwingz!

Title: Re: SD1100 IS: an inverted microscope eyepiece as a macro attachment
Post by: Microfunguy 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 ?

Title: Re: SD1100 IS: an inverted microscope eyepiece as a macro attachment
Post by: lngndvs 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

Title: Re: SD1100 IS: an inverted microscope eyepiece as a macro attachment
Post by: lngndvs 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

Title: Re: SD1100 IS: an inverted microscope eyepiece as a macro attachment
Post by: lngndvs 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

Title: Re: SD1100 IS: an inverted microscope eyepiece as a macro attachment
Post by: lngndvs 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