Astrophotography with K-r

VE2CJW · 09-06-2011, 06:16 PM

Hi. A few nights ago, I did a little experiment with only a Pentax 55-300mm lens with a doubler. The result was interesting but would have been better if I had used the GPS which I have ordered but not received yet. The parameters of the picture are ISO 3200, effective f9 and 3 seconds of exposure. The subject was Jupiter with 4 of its moons. There is some trailing because even 3 seconds is too much without guiding. Jupiter is overexposed because you don't see the moons otherwise since they are quite dim. I am in the process of getting a telescope which will make things more interesting. Comments welcomed.

Last edited by VE2CJW; 12-10-2012 at 01:09 PM.

Lex Madera · 09-09-2011, 05:58 PM

I have a couple for comparison. #1 is the Pentax 18-135mm at 135. The second is the 50-300mm at 300. I tried a 3d shot with an optika 500mm with 2x teleconverter, but it came out so blurred it was aweful. I haven't mastered manual focus with it, yet.

baman · 09-21-2011, 07:15 AM - **1 Like**

These were taken at prime focus through a CDK20 Planewave telescope.
Exposure times were 2 to 3 minutes per photograph.
1.Comet Gerrad
2.Swan nebula
3.Dumbbell nebula

**GerryJM** · 09-22-2011, 07:42 PM

Has anyone used one of these focusing aids?

Kendrick Astro Instruments - Kwik Focus, off axis filter focus

stace8383 · 07-24-2012, 12:16 AM

I've enjoyed reading the posts and seeing the pictures here... I'm just starting to get into astrophotography with my K-r, looking forward to learning new techniques.

stace8383 · 07-24-2012, 01:20 AM

This is one I took of the Southern Cross a couple of nights ago.
ISO 800, 10 second exposure, f/4.5

09-06-2011, 06:16 PM	#46
VE2CJW Veteran Member Join Date: Nov 2006 Location: Candiac, QC, Canada Photos: Gallery Posts: 403	A little experiment without the O-GPS1. Hi. A few nights ago, I did a little experiment with only a Pentax 55-300mm lens with a doubler. The result was interesting but would have been better if I had used the GPS which I have ordered but not received yet. The parameters of the picture are ISO 3200, effective f9 and 3 seconds of exposure. The subject was Jupiter with 4 of its moons. There is some trailing because even 3 seconds is too much without guiding. Jupiter is overexposed because you don't see the moons otherwise since they are quite dim. I am in the process of getting a telescope which will make things more interesting. Comments welcomed. Last edited by VE2CJW; 12-10-2012 at 01:09 PM.

09-09-2011, 05:58 PM	#47
Lex Madera Senior Member Join Date: Apr 2011 Location: Virginia, Austria, Ukraine Photos: Gallery Posts: 188	moon from 20110909-comparison I have a couple for comparison. #1 is the Pentax 18-135mm at 135. The second is the 50-300mm at 300. I tried a 3d shot with an optika 500mm with 2x teleconverter, but it came out so blurred it was aweful. I haven't mastered manual focus with it, yet. Attached Images

09-22-2011, 07:42 PM	#49
GerryJM Site Supporter Join Date: Mar 2011 Location: Toronto Photos: Albums Posts: 53	Focusing Aid - Bahtinov Mask Has anyone used one of these focusing aids? Kendrick Astro Instruments - Kwik Focus, off axis filter focus

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07-24-2012, 12:16 AM	#50
stace8383 Inactive Account Join Date: Jul 2012 Location: Melbourne Posts: 27	I've enjoyed reading the posts and seeing the pictures here... I'm just starting to get into astrophotography with my K-r, looking forward to learning new techniques.