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Sadr Region - experimenting with a Pentax-lens/ASI-camera adaption

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#1 Pete_xl

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Posted 18 June 2019 - 02:59 AM

This is the first real night test for an adaption of my Pentax lenses to the ZWO 7x36mm filter wheel and the Zwo cameras of mine.

The DSO image is not much processed as it was just a test.

66 x 200s HA @ gain 139 Pentax DFA 50mm @ F/2.8 Macro at ZWO ASI1600mmp.

 

The whole stuff is mounted on top of my "normal" gear.

 

picture124742.jpg

 

 

...at night with moon an Jupiter behind...

 

picture124796.jpg

 

The result:

 

48081399442_940793c209_b.jpg

Sadr region with Pentax DFA 50mm Macro Lens by pete_xl, auf Flickr

 

Full resolution on Astrobin: get.jpg?insecure

 

Though I had expected some I was surprised by the presence of so much signal in that region. The Crescent, Pelican and North America nebulae can be found in the frame. Obviously there is a lack of sharpness. The lens was full open and I could have taken more time for the manual focusing. My Bahtinov masks did NOT work.

 

APP for preprocessing and PSCC2019/LR for the rest. This was just a quick processing because it was only a test. Next time I plan to stop down the lens a bit with stop down rings. 


Edited by Pete_xl, 18 June 2019 - 03:01 AM.

  • Gregory, edif300, psandelle and 8 others like this

#2 james7ca

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Posted 18 June 2019 - 03:33 AM

That's a nice looking field.

 

I have an old 50mm Minolta macro lens and I've always wondered how it would do for astrophotography. I've used my Nikon and Sony lenses quite a bit for imaging (one-shot-color and H-alpha) and I have an inexpensive 200mm Kenko T-mount lens that I use for H-alpha and OIII (but not RGB, too much chromatic aberration).

 

I'm not sure how well a front-mounted aperture stop will work on a lens as short as a 50mm, but macro lenses typically use a very symmetrical lens grouping so it may be okay. However, wide angle and reverse-telephoto design lenses really don't work very well with front aperture stops (causes significant vignetting and often other aberrations).



#3 psandelle

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Posted 18 June 2019 - 09:50 AM

Nice pic! And nice setup (I love me those Photo Line scopes)!

 

Paul


Edited by psandelle, 18 June 2019 - 10:06 AM.


#4 elmiko

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Posted 19 June 2019 - 12:56 AM

Neat pictures Pete. Love your Balcony Observatory!

Mike




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