Print Page - Taurus widefield

Title: Taurus widefield
Post by: RobertM on Dec 11, 2009, 16:36:07

This another from Riberac earlier on when the conditions were pretty misty and before the streetlights were turned off.

This is a composite of 23 x 5 min frames taken with the unmodified EOS450D and a Pentax SMC 1.4:50 lens stopped down to F4.

(http://farm3.static.flickr.com/2553/4176959106_3ddf855d4f_b.jpg)

Link to 2x2 binned version:

http://farm3.static.flickr.com/2553/4176959106_72143986f5_o.jpg (http://farm3.static.flickr.com/2553/4176959106_72143986f5_o.jpg)

TFL

Title: Re: Taurus widefield
Post by: Mike on Dec 11, 2009, 17:06:59

What were you doing in Riberac anyway?

Title: Re: Taurus widefield
Post by: RobertM on Dec 11, 2009, 17:39:34

Imaging with Mark, at least the sky was clear for one night.

Title: Re: Taurus widefield
Post by: Mac on Dec 11, 2009, 17:51:12

Very nice wild field.

Are there dust lanes in the image, or processing artefacts.

Mac.

Title: Re: Taurus widefield
Post by: The Thing on Dec 11, 2009, 17:56:57

Stunning.

Title: Re: Taurus widefield
Post by: RobertM on Dec 11, 2009, 19:37:21

QuoteAre there dust lanes in the image, or processing artefacts

I know those on the left are so I'm kind of I'm assuming the rest are too.

Title: Re: Taurus widefield
Post by: MarkS on Dec 11, 2009, 19:42:13

Very nice Robert - I'm glad that one came out well.

Mark

Title: Re: Taurus widefield
Post by: Fay on Dec 13, 2009, 21:45:19

Really nice Robert, yes dust lanes are interesting.

Title: Re: Taurus widefield
Post by: Rocket Pooch on Dec 14, 2009, 18:18:39

Hi,

Wow wide field, would be good 1x1 because the sampling does not look right 2x2, but early days with that camera so good effort :-)

Chris

Title: Re: Taurus widefield
Post by: RobertM on Dec 14, 2009, 20:19:16

I binned it 2x2 for web display but I'll post the 1x1 too.

Edit: Here it is: http://farm3.static.flickr.com/2770/4186130702_7fcfcce8e8_o.jpg (http://farm3.static.flickr.com/2770/4186130702_7fcfcce8e8_o.jpg)

(Mergerd two posts and changed img to link in the interests of readers' bandwidth etc. -- Rick)

Title: Re: Taurus widefield
Post by: Daniel on Dec 17, 2009, 07:46:49

Lovely Imaage Robert, those dark dust lanes are amazing, also loving the 8 pointed diffraction spikes your getting with the lenses your using.

Daniel
:O)

Title: Re: Taurus widefield
Post by: RobertM on Dec 17, 2009, 08:07:13

Oops sorry about posting the image rather than the link Rick.

Thanks Daniel. I'd actually rather not have the spikes but there's nowt I can do about it. I'm looking around for a lens that I could use wide open so if you know of one in the 40-60mm bracket then do let me know.

Title: Re: Taurus widefield
Post by: MarkS on Dec 17, 2009, 08:54:24

If you want to prevent spikes, could you stop down the lens by placing a a circular cut out on the front of the lens - e.g a big metal washer.

It would certainly be good to have a 50mm F1.8 lens with pin-sharp stars from corner to corner, fully open. But I fear that either they don't exist or they would be prohibitively expensive.

Mark

Title: Re: Taurus widefield
Post by: Ian on Dec 17, 2009, 09:04:23

why would you want to prevent spikes? I thought we all rather liked them....

:boom:

Now, where's that thread lock button...

Title: Re: Taurus widefield
Post by: Rick on Dec 17, 2009, 09:55:58

Quote from: Ian on Dec 17, 2009, 09:04:23why would you want to prevent spikes? I thought we all rather liked them....

:boom: Nothing wrong with them, so long as they're not fake. :boom:

Quote from: Ian on Dec 17, 2009, 09:04:23Now, where's that thread lock button...

Down the bottom of the page. ;)

Title: Re: Taurus widefield
Post by: RobertM on Dec 17, 2009, 10:53:09

Looks like I'm stuck with spikes with this lens anyway until I find one that doesn't have so much abberation.

Orpington Astronomical Society

Astronomy => Astrophotography => Topic started by: RobertM on Dec 11, 2009, 16:36:07