Jupiter showing great red spot and europas shadow

[5ash]

Just processed this one from 100 images using registax . taken with lx90 /2x barlow /LPI. Its the first of many i took this evening(14th april) but have not got round to processing the rest . Thought i'd post this before retiring for the night.
philip

[iceman]

Very nice!
What's the focal length of the LX90? I would've expected the image scale to be bigger with a 2x barlow..?

What resolution did you capture these at?

[toetoe]

Would you be able to see the moon shadow without using the barlow or would the detail of the whole pic be lost.?

[iceman]

You'd probably still be able to see it, though the whole scale would be much smaller. At that size it wouldn't be much more than a pixel or 2 wide :)

[5ash]

I used a meade x2 barlow with the lx90 . I believe from a sky and telescope review some years ago that they tested them at x1.74. That would make the f number F17.4 . Im also using an LPI which produces an image smaller than a Toucams. I captured and processed them as BMP 's to prevent "lossiness " i hope? The picture certainly looks better than those i've taken using jpeg format. If i get a better one from the other images i will post it.
philip

[toetoe]

Sorry but i am still trying to understand all this stuff, are you saying Philip that the picture quality is better in a BMP format over JPEG`s ?

[5ash]

Peter as far as i can gather jpeg format loses detail when you save or manipulate imges .apparently the pixels are arranged for visual use not idally for image manipulation. also they are a compressed format that leads to small errors. I'm sure a more expert member will be able to explain it better.
philip

[toetoe]

Thanks Philip, if i don`t ask i don`t find out. :)

[MiG]

If you get 8x8 pixel patches of artifacts then the JPEG compression is responsible.

[atalas]

Nice detail Philip:)

Louie