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  #1  
Old 27-10-2006, 07:53 AM
strongmanmike's Avatar
strongmanmike (Michael)
Woohoo it's clear

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Pentax 200mm F2.5 lens - first light

I recieved my Starlight-PentaxK adapter from Steve Mogg of "Mogg
Adpaters" yesterday. I can now shoot through my Pentax (K mount)
200mm F2.5 SMC camera lens. Steve sells a wide range of adapters and
other astro things for doing all sorts of stuff and he is a
Canberran like me so check out his site - link is under the images.

Unfortunately I can only use one filter at a time and the camera must
be disconected from the lens to change filters so full LRGB is
probably out of the question (although I may give it a bash if I'm
feeling energetic) but some B&W imaging and particularly Halpha stuff
will be fun with the 2.5deg X 1.9deg FOV using the relatively small
chip of the SXV-H9.

Bad gradients with this FOV under light poluted skies though :-( My
gradient exterminator by Rus Croman wouldn't do a clean job of
removing it so I didn't apply it in the end.

Here is the setup and first light image of 47 Tuc before clouds
rolled in. As usual the 47 Tuc image has no darks, no flats and no
image smoothing applied during processing :-)

http://www.pbase.com/strongmanmike2002/pentax_200mm_lens_images

Hope to have a bit of fun with this configuration and Halpha as the
moon gets bigger.

Mike
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  #2  
Old 27-10-2006, 08:00 AM
Dennis
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Hi Mike

Wow - that is an excellent image at 200mm F4. I'm really surprised that stopping the lens down only by a single stop has produced such tight, round stars right to the edge. Is this a modern era digital lens, or an older 35mm SLR lens?

Cheers

Dennis
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  #3  
Old 27-10-2006, 08:19 AM
jase (Jason)
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Nice wide field there Mike. Good work.
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  #4  
Old 27-10-2006, 08:23 AM
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Lester
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Very nice image Mike,

that lens looks like a great performer, has revealed some faint fuzzies there also.
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  #5  
Old 27-10-2006, 09:20 AM
ausastronomer (John Bambury)
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Mike,

Great image Mike. What scope is that on the NJP mount and do you still have the 6"/F7.5 AP refractor?

CS-John B
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  #6  
Old 27-10-2006, 11:02 AM
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spacezebra (Petra)
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Beautiful image of 47 Tuc.

Excellent Mike - I keep watching your site with great interest.

Cheers Petra
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  #7  
Old 27-10-2006, 07:57 PM
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strongmanmike (Michael)
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Quote:
Originally Posted by Dennis
Hi Mike

Wow - that is an excellent image at 200mm F4. I'm really surprised that stopping the lens down only by a single stop has produced such tight, round stars right to the edge. Is this a modern era digital lens, or an older 35mm SLR lens?

Cheers

Dennis
Hi Dennis

The lens was purchased in 1985 but is a genuine Pentax 200mm SMC lens. It wouldn't have ED glass so there is a bit of Chromatic abberation. The chip in my SXV-H9 is pretty small so I was confident there would be no edge distortion. My intention is to use for B&W and Halpha imaging.

Cheers

Mike
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  #8  
Old 27-10-2006, 07:59 PM
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strongmanmike (Michael)
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Quote:
Originally Posted by ausastronomer
Mike,

Great image Mike. What scope is that on the NJP mount and do you still have the 6"/F7.5 AP refractor?

CS-John B
Hi John

That "is" the AP152EDF :-)

Mike
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  #9  
Old 27-10-2006, 08:02 PM
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strongmanmike (Michael)
Woohoo it's clear

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Glad you are a regular to Sid on IO's site :-)

Mike
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  #10  
Old 30-10-2006, 07:45 PM
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atalas
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Nice shot Mike !
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