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Uranus 20" DK.

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#26 azure1961p

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Posted 17 October 2012 - 09:55 PM

Paul,

Im particularly interested in how you reason or interpret the color filters having visibility, or lack on its moon[s].
It would seem blue should transmit the most light because of the spectrum pass in low light for the retina, and the red shoulve yielded nothing instead.

Im tempted to want to think the moon was reddish and so the filter passed it well, but this isnt the case. Perhaps the red helped the seeing steady by passing the sharper less affected light wavelengths. Blue is known dispersal more so in seeing less than optimum.

Pete

#27 stanislas-jean

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Posted 18 October 2012 - 01:34 AM

What was in use
WF without filter
W12 deep yellow filter
Refer to the previous post with the clouds absorption bands showed on the spectrum graph for the selection of the filter.
There is no matter of blue filter here, except for showing nothing visually with the use of such filter (mainly the W82) that cut red light but keep the green light. The use of the blue filter is interresting to be more confortable for the uranus report. IF nothing is reported with it is in a certain way a demontration. If something is this has to be controversial. But when showing the italian observer reports of the alpo site the blue filter brought the collection of the dark collar bordering the polar cap. Interresting, no? An artefact, probably not, in spite of the "authorised" views contracditory.
But the contrasts are fluctuing by periods it seems.
Stanislas-Jean






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