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raspberry pi noir



 
 
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  #31  
Old December 9th 14, 04:21 PM posted to rec.photo.digital
ray carter
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Posts: 79
Default raspberry pi noir

On Tue, 09 Dec 2014 03:19:45 -0800, Whisky-dave wrote:

On Tuesday, 9 December 2014 03:44:10 UTC, ray carter wrote:
On Fri, 05 Dec 2014 03:27:05 -0800, Whisky-dave wrote:

On Thursday, 4 December 2014 19:09:53 UTC, PeterN wrote:
On 12/4/2014 8:39 AM, Whisky-dave wrote:

snip


But going by some on the NG you can;t be a p[hotographer unless
you spend a fortune on equipment.


Very few would say that. And IMHO, few who might, would rarely be a
good photographer.


--
PeterN

Well how can you get a 'good' photo with just a 5meg pixel camera and
think of the size of the actual sensor, you'd be laughed at if you
entered in to a competition up against even the average DLSR camera.

I really don;t see the quality of a pi camera at 17 quid which
includes the lens, sensor is fixed focus and fixed aperature being
able to comptete.


Still don't get the point, do you?


Yes I do, you don't, I've used a pi camera have you ?


Mine are on the way.

Would you mind posting some examples?
  #32  
Old December 19th 14, 05:02 PM posted to rec.photo.digital
ray carter
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Posts: 79
Default raspberry pi noir

On Tue, 02 Dec 2014 09:44:54 +0000, Martin Brown wrote:

On 01/12/2014 15:41, ray carter wrote:

panning to set up a rpi 'noir' camera soon - it comes with no IR
filter.
Question: how about an inexpensive source for an IR blocking filter AND
an IR passing, visible blocking filter?



IR blocking filter aka hot mirror you can get from amateur astronomy
suppliers although it probably will cost more than the rpi.

http://www.telescopehouse.com/acatalog/

Revelation_IR_Blocking_Filter_1_25____510.html

Wratten 87 is the usual choice for near IR long pass although you can
get custom colloidal glass filters at any cutoff in steps of 10nm.
(for a price)

http://www.edmundoptics.co.uk/optics...longpass-edge-

filters/optical-cast-infrared-ir-longpass-filters/1918

Cheap IR pass filters are easier the unexposed tail of slide film will
block all visible light and pass near infrared pretty well. If you have
a long enough piece it is interesting to put it across your eyes and
wait until they adapt to the low light levels. You will after about a
minute get to see the world again in pseudo false colour near IR. Green
foliage looks very bright and sky looks much darker.


It seemed the most cost effective solution was to buy a NOIR camera plus
a regular camer plus an IR pass filter - still was only around $70.
 




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