Current Server Time: 09:54 (Central Europe)

#apertus IRC Channel Logs

2019/09/28

Timezone: UTC


07:32
Spirit532
left the channel
07:33
Spirit532
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07:48
BAndiT1983|away
changed nick to: BAndiT1983
07:50
BAndiT1983
changed nick to: BAndiT1983|away
09:33
Bertl
off to bed now ... have a good one everyone!
09:33
Bertl
changed nick to: Bertl_zZ
09:49
BAndiT1983|away
changed nick to: BAndiT1983
10:27
BAndiT1983
changed nick to: BAndiT1983|away
10:43
comradekingu
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10:45
comradekingu
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12:41
Y_G
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13:03
Y_G
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13:03
Y_G
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14:03
se6ast1an_
good progress today with CAD modeling, my list of still open todos is almost empty
16:32
Bertl_zZ
changed nick to: Bertl
16:32
Bertl
morning folks!
16:32
Bertl
great!
17:44
se6ast1an_
good morning
18:28
RexOrCine|away
changed nick to: RexOrCine
18:39
RexOrCine
"Adventures in Spectrometry" - by Roger Cicala:
18:39
RexOrCine
https://www.lensrentals.com/blog/2018/03/a-geek-of-many-colors-adventures-in-spectrometry/
18:39
RexOrCine
"Looking at Cine Lens Color Shifts Using Spectrometry" - by Roger Cicala:
18:39
RexOrCine
https://wordpress.lensrentals.com/blog/2018/04/looking-at-cine-lens-color-shifts-using-spectrometry/
18:39
RexOrCine
"The absolute sensitivity of digital colour cameras" (PDF):
18:39
RexOrCine
https://www.osapublishing.org/oe/abstract.cfm?uri=oe-17-22-20211
18:40
RexOrCine
Spectron - an open source project for measuring and obtaining digital devices spectral sensitivity curves
18:40
RexOrCine
 Initially this was conceived with the goal of constructing an automated device with an aid to accurately measure spectral sensitivity curves for digital camera sensors. The project has a broader use though and can be used to measure spectral sensitivity curves of various light sensitive sensors (not just camera sensors) - for example spectral sensitivity curves of photodiodes.
18:40
RexOrCine
https://github.com/Alexey-Danilchenko/Spectron
18:48
Bertl
cool
18:48
RexOrCine
By far the biggest cause of color shifts is coatings. A modern lens has, say, 16 elements in 10 groups => 20 air to glass interfaces. 4% reflection each gives you 0.96^20 = 44% transmission. The coatings are responsible for bringing that up to a uniform ~90%. If they don't do it in a way that is spectrally uniform, you get color shifts.
18:49
RexOrCine
- Brandon Dube.
18:49
RexOrCine
... who's hard to find. I gave up.
18:49
RexOrCine
(well because there are a lot of them out there)
18:50
Bertl
ah, the C12880MA sensor is even available ... for abpit 400 bucks
18:50
Bertl
*about
18:51
comradekingu
You want to put it in the camera live, or make a profile of the lens?
18:55
Bertl
currently no plans for either
18:57
RexOrCine
Spectral Data Analysis:
18:57
RexOrCine
https://github.com/brandondube/raynbow
18:57
RexOrCine
http://brucelindbloom.com/SpectCalcSpreadsheets.html
19:03
RexOrCine
Found him.
19:05
comradekingu
I dug up https://hughski.com/colorhugplus.html but it doesn't seem to have materialized
19:05
comradekingu
Back to bed with me
19:22
RexOrCine
https://github.com/Olaf-Optical/BigAssTableOfLenses
19:29
Y_G
left the channel
19:29
RexOrCine
se6as1an_: Well done lad. Remember I was talking about a map that opens up various pages? Not quite - https://en.wikipedia.org/wiki/Help:Table#Section_link_or_map_link_to_a_row_anchor
20:51
se6ast1an_
interesting, we should try this in our mediawiki sandbox
20:51
se6ast1an_
like {{Image label small|x=0.5775|y=0.863|scale=400|text=[[#Table row 37|<span style="color: #0654AD;">Albania</span>]]}}
20:51
se6ast1an_
off to bed, good night
20:52
RexOrCine
If you can find a method for using it and it's clear I'll stack it up afterwards. Playing with something else presently
20:52
RexOrCine
nn
21:53
BAndiT1983|away
changed nick to: BAndiT1983
22:05
intrac
left the channel