More Fickle Fingers

strongmanmike (Michael) · #1 14-02-2009, 02:31 AM

I've added two more images from ground based scopes to my Fickle Finger comparison.

I have added a crop from the just released Eta Carina image by the ESO 2.2m telescope in Chile using the big wide field imager camera (I cropped directly from the 134meg tiff image) and a crop from what is the best image I have seen of the Keyhole by an amateur (and perhaps by anyone?) - that by Johannes Schedler using a magnificent 20" corrected Cassegrain in excellent conditions from Namibia, it is an interesting comparison:

http://www.pbase.com/strongmanmike20...53793/original

Interesting to compare the star sizes, all three ground based scopes have about the same size star images (slightly tighter in Yohannes image) and none used adaptive optics either Peter

....the HST has pin sharp dots of course.

Oh and here's another interesting bit I really like, cropped from the full frame image: http://www.pbase.com/strongmanmike20...56782/original

More fun

Mike

Omaroo (Chris Malikoff) · #2 14-02-2009, 07:09 AM

Interesting perspective Mike. It's be interesting to see what an earth-bound scope with the Lucky Camera at prime focus would do with it.

YEp - the ridge is my favourite part too.

Alchemy (Clive) · #3 14-02-2009, 07:10 AM

interesting the 20 inch didnt use adaptive optics, its got more detail than the 3m one... although i think they could still eek more detail from that

the gas ridge , yep lovely.

AlexN · #4 14-02-2009, 03:41 PM

I think its amazing that the 20" corrected cassegrain outdid the 2.2m RC image.. Hubble, once again, creams the lot, however the 20" image definitely bridges the gap somewhat... Must have had VERY nice seeing to achieve that kind of detail without AO of some description.. Very good comparison...

Oh, and yes, the Gas ridge is my favorite area of Eta Car... followed by a dark dusty area just west of there... Hang on and I'll get crops from my image to show these..

Alex.

AlexN · #5 14-02-2009, 03:59 PM

kk... here we go... (dont laugh at me!

)

Heres the gas ridge from the Megrez 102 + QHY8 (714mm focal length, 7.8x7.8um pixels)

And the previously mentioned dark dusty area from the same shot..

Jen · #6 14-02-2009, 04:47 PM

nice pics

strongmanmike (Michael) · #7 14-02-2009, 06:16 PM

Quote:

Originally Posted by AlexN

kk... here we go... (dont laugh at me!

)

Heres the gas ridge from the Megrez 102 + QHY8 (714mm focal length, 7.8x7.8um pixels)

And the previously mentioned dark dusty area from the same shot..

Don't laugh big Al, it's good to do something different, keeps the passion alive

they look pretty nice in fact.

drawing attention to comparisons like this throws the door open to us to keep pushing the boundaries...to go boldy where no man has gone before, to seek out strange new pixels....

Mike

gregbradley · #8 14-02-2009, 08:00 PM

Interesting comparison Mike.

Goes to show an expertly made APO of moderate aperture can hold its own.

I like the image of the "taxi driver's salute". Where is it anyway in the overall image?

Greg.

AlexN · #9 14-02-2009, 08:11 PM

Greg..

This might put it into perspective..

strongmanmike (Michael) · #10 14-02-2009, 09:48 PM

Quote:

Originally Posted by gregbradley

Interesting comparison Mike.

Goes to show an expertly made APO of moderate aperture can hold its own.

I like the image of the "taxi driver's salute". Where is it anyway in the overall image?

Greg.

Yes, err?.. know anyone with a 7" APO by any chance..?

Surprised you haven't noticed it before actually..? but the one finger salute is right next to the Keyhole:

http://www.pbase.com/strongmanmike20...71681/original

Mike

gregbradley · #11 15-02-2009, 11:12 AM

Thanks Mike. Yes I have seen that one. There are a few of these little - I don't know what are they? Coagulations of dust I guess?

I'll have to check out some of my images of Eta to see what sort of resolution I got on that.

Greg.

renormalised (Carl) · #12 15-02-2009, 11:20 AM

Quote:

There are a few of these little - I don't know what are they? Coagulations of dust I guess?

Bok Globules

jase (Jason) · #13 15-02-2009, 08:56 PM

I saw Johannes post on the SBIG forums comparing the images too. You probably started something.

A few were sceptical that plagiarism wasn't involved. In particular the diffraction spikes align perfectly. This is quite odd given the Keller scope uses a 90 degree spider. All comes down to camera orientation. Seriously ~20" vs 2.2 metres, seeing aside, there has got to be a difference.

strongmanmike (Michael) · #14 15-02-2009, 11:44 PM

Quote:

Originally Posted by jase

I saw Johannes post on the SBIG forums comparing the images too. You probably started something.

A few were sceptical that plagiarism wasn't involved. In particular the diffraction spikes align perfectly. This is quite odd given the Keller scope uses a 90 degree spider. All comes down to camera orientation. Seriously ~20" vs 2.2 metres, seeing aside, there has got to be a difference.

Yes he sent me that after I asked him if it was ok to use his image which I had just posted on my site, so yes, I think I gave him the idea?

Regards the inference leveled at Johannes, I'm not sure I understand how the diffraction spikes match so precisely but the ESO image was only just released so how could Johannes have laid his hands on it for his image which he took back in May last year??

...somebody unable to accept that a Philip Keller designed corrected Cassegrain is superior to the beloved US made RCOS maybe?

.

I was pretty happy how my image held up against these super duper examples though so I no complain Mr Fawlty

Mike