Venus Cloud Patterns April 19th 2023

[lukebl]

Just realised that I posted this in the 'observing' forum rather than 'imaging'; so here it is again. Despite Venus's relatively small size (15.7 arcsecs, 70% phase), and very blustery winds, I managed to capture some very clear cloud formations with the Baader U-Filter. I see these filters are now over £200, so I ought to make use of it. The really bright patch on the limb at 4 the O'clock position was very prominent.

Captured with a 250mm f/4.8 Newtonian, 5x Powermate, ZWO ASI290MM Mini cam, Baader U-Filter and Baader IR-Pass Filter.

About 3000 frames captured with the U-Filter, and about 10,000 with the IR Filter. Processed in Autostakkert, Registax and Photoshop. RGB thus: R(IR), G(50%U/IR), B(U)

[neil phillips]

Very nice the advantage of larger scopes very apparent.  

[Space Cowboy]

That's sweet!

[neil phillips]

What's also interesting is your considerably oversampled F24, F12 would seem closer to optimum. But doesn't appear to have hurt the result. Makes me think i will experiment with different focal lengths. Starting from optimum and moving up. With Venus small size its certainly helping my old eyes pick out the details.

Edited April 20, 2023 by neil phillips

[lukebl]

2 hours ago, neil phillips said:

...What's also interesting is your considerably oversampled F24, F12 would seem closer to optimum...

D'you know, after years of imaging I still don't understand what oversampling and undersampling really means in practice.

I just try stuff. And if it works, then great! If not ... whatever! I don’t like rules.

Edited April 20, 2023 by lukebl

[Pete Presland]

Very nice Luke, some nice details visible there.

[saac]

That is very nice indeed, very nice. Well done.

Jim 

[neil phillips]

56 minutes ago, lukebl said:

D'you know, after years of imaging I still don't understand what oversampling and undersampling really means in practice.

I just try stuff. And if it works, then great! If not ... whatever! I don’t like rules.

lol got some of my best stuff oversampled. Rules can be bent. Was more a observation of wanting to perhaps go longer myself after seeing how good it was.