• Welcome to Orpington Astronomical Society.
 

News:

New version SMF 2.1.4 installed. You may need to clear cookies and login again...

Main Menu

Taurus widefield

Started by RobertM, Dec 11, 2009, 16:36:07

Previous topic - Next topic

0 Members and 2 Guests are viewing this topic.

Print
Go Down Pages1 2 All
User actions

RobertM

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.



Link to 2x2 binned version:

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

TFL

Mike

#1
Dec 11, 2009, 17:06:59
What were you doing in Riberac anyway?
We live in a society exquisitely dependent on science and technology, in which hardly anyone knows anything about science and technology. Carl Sagan

RobertM

#2
Dec 11, 2009, 17:39:34
Imaging with Mark, at least the sky was clear for one night.

Mac

#3
Dec 11, 2009, 17:51:12
Very nice wild field.

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

Mac.


The Thing

#4
Dec 11, 2009, 17:56:57
Stunning.

RobertM

#5
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.

MarkS

#6
Dec 11, 2009, 19:42:13

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

Mark

Fay

#7
Dec 13, 2009, 21:45:19
Really nice Robert, yes dust lanes are interesting.
It is healthier to be mutton dressed as lamb, than mutton dressed as mutton!

Rocket Pooch

#8
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

RobertM

#9
Dec 14, 2009, 20:19:16 Last Edit: Dec 14, 2009, 23:47:04 by Rick
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

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

Daniel

#10
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)

RobertM

#11
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.

MarkS

#12
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

Ian

#13
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...

Rick

#14
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. ;)
Print
Go Up Pages1 2 All
User actions