with 2 scopes a 100mm achromat and a 120ED semi apo chineese.
Venus exhibits its polar caps as clear to bright surrounded by a dark collar band.
Except this the general pattern noted remains usual with no specific event collected with the present means.
The vision was altered by the presence of high altitude cyrrus clouds making for the 100mm observation period more difficult as they appear deeper for masking features on planet in comparison with the 120ED.
Anyway,the results are clear:
the 120ED exhibited more contrasty features in white light,substantially less contrasty in red and blue channels than those noted with the 100mm.
It is strange to note such phenomena with an ED scope for which the results would be better theorically.
I had no time for verification of what was appearing with a W11 filter in the 120ED for making comparison with observations done in white light.
On July the 1st same tests were conducted but under pure sky at the same time period. The effect is confirmed with adding the fact that the W11 filter use exhibited the same features observed in white light and still the lost in B and R channels.
My conclusion is the scope is not enough suitable for planet observations.
What can be the reasons ( this is the fifth ED scope for which I noted this on 100, 110 and now 120ED)?
Open to read some answers about.