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Io shadow transit, 18th Feb 2013

lukebl

By lukebl
in Imaging - Planetary

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lukebl

lukebl

Posted
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Hi all,

Here's a few captures of the transit of Io this evening (18th Feb 2013), captured at 5 minute intervals from 19:45. 250mm f/4.8 Newtonian, 3x Televue Barlow, DFK 21AU618.AS. 2000 frames @ 1/60 sec, c 60fps. Small, but quite nice, I think!

jupiter0003-13-02-18-19-35-57.gif

8487406092_8829599f4b_h.jpg

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lukebl

lukebl

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Has one bought oneself a new camera?? (Nice images and animation Luke!)

Cheers indeed everyone!

Yes, one has bought a new camera, but I'm not sure if I needed to.

As you know Roger, I had just about given up on my QHY IMG132e, so decided to get a DFK21AU618 and am now the proud owner of two planetary cams (5, if you include my QHY5 and assortment of webcams).

However, the IMG seemed to take this as a hint to sharpen up its act, and is now performing rather well. I was originally interested in the IMG partly because of its smaller pixels (3.63 microns compared to 5.6 microns), and therefore higher resolution. Now, I know the DFK is reckoned to be a good planetary cam, and I know the boffins will shoot me down and tell me that it's not down to pixel size, and all other scientific reasons why the DFK is a better cam (CCD v CMOS, more sensitive, faster frame rate, QE, etc), but given the focal lengths I'm working at (no more than 3600mm) logic dictates that the smaller pixels surely result in a sharper image? There are simply more pixels for the size of the images. Therefore less 'blocky'. Therefore sharper. If, assuming focus and collimation are equal, you have two images of the same size, one with, say 70,000 pixels, and the other with 125,000 pixels, the latter one is surely sharper. My preliminary results seems to show that, and I am getting the same exposures and frame rate with the IMG as the DFK.

So, maybe the IMG deserves to be more popular. Anyway, when I get a moment I'll do a series of comparative tests and post them here.

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yelsac

yelsac

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Posted

Hi all,

Here's a few captures of the transit of Io this evening (18th Feb 2013), captured at 5 minute intervals from 19:45. 250mm f/4.8 Newtonian, 3x Televue Barlow, DFK 21AU618.AS. 2000 frames @ 1/60 sec, c 60fps. Small, but quite nice, I think!

jupiter0003-13-02-18-19-35-57.gif

8487406092_8829599f4b_h.jpg

Hi great images & superb animation.

I've managed to do an animation (although no where near as good as yours!)

When I try to post it on here it tells me I'm not permitted to upload this kind of file!

Any idea how I can post it?

thanks

yelsac

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