Jump to content

 

1825338873_SNRPN2021banner.jpg.68bf12c7791f26559c66cf7bce79fe3d.jpg

 

Very first imaging trial


old_eyes
 Share

Recommended Posts

It was a clear cold night yesterday in North Wales, so as well as doing some visual observing I thought I would try some basic imaging.

I piggy-backed my Canon 350D with a 100mm F2.8 macro lens on top of my Nexstar 6SE, and basically followed the method in Michael Covington's book Digital SLR Astrophotography.

First trial didn't work out. I tried for the Double Cluster, and because it was near the zenith I couldn't focus accurately (kneeling on the frozen ground), and when I looked at the images later I could see that Covington is right and you can't take 30 second exposures on an Alt-Az mount close to the zenith.

Second trial was Orion's Belt and the nebula. 11 x 30 second exposures with 6 dark frames. I just threw them at Seep Sky Stacker and left everything on default values. The result was:

post-17595-133877414846_thumb.jpg

All I have donw to this is adjust the levels in Photoshop Elements

Next image is a cropped version around the nebula. The focus is way off, but you can see the nebula.

post-17595-133877414852_thumb.jpg

Finally the centre section of an image of the Pleiades - 11 x 30 second frames, 6 dark frames, Deep Sky Stacker

post-17595-133877414859_thumb.jpg

There are all sorts of things wrong with these images, but I am unreasonably proud of them for a first attempt.:)

old_eyes

Link to comment
Share on other sites

And so you should be pleased - welcome to the slippery slope that is deep sky imaging ....

Thanks Steve. I also have your book and am studying carefully. Very inspiring.

I have a T-ring adaptor on the way as a Xmas present, so will be able to try some prime focus images next.

The hardest thing was trying to focus in the field. Need to practise that.

old_eyes

Link to comment
Share on other sites

Thats a nice set of images for a first attempt. It may be worth investing in a right angle finder for your camera. It will help with focusing a great deal. It's always best to set the focus on a bright star like Vega or Cappella etc.

Here's a link to the view finder mentioned.

1.25x-2.5x Angle Finder for Canon 1000D 450D 400D A1C - eBay (item 260417890789 end time Dec-22-09 17:45:24 PST)

Regards

Kevin

Link to comment
Share on other sites

It may be worth investing in a right angle finder for your camera. It will help with focusing a great deal. It's always best to set the focus on a bright star like Vega or Cappella etc.

Here's a link to the view finder mentioned.

1.25x-2.5x Angle Finder for Canon 1000D 450D 400D A1C - eBay (item 260417890789 end time Dec-22-09 17:45:24 PST)

Regards

Kevin

It's definitiely worth thinking about. I was using Rigel to test focus, but it was difficult to see anything through the finder. It was also a bit awkward to get my head in the right place. An angle finder should help.

old_eyes

Link to comment
Share on other sites

That's a great start, no wonder your proud. What I do to get focus when doing prime focus is use a Bhatinov mask and a bright star, take a series of shots until the diffraction spikes are perfect, then remove the Bhatinov mask...

In the diagrams on the Bhatinov mask I have seen, it still looks a subtle difference between in focus and out of focus. Do you find it makes it much easier to find the focus point?

old_eyes

Link to comment
Share on other sites

It is a LOT easier. Last night I slewed to Capella stuck the mask on and had it focused in 2 minutes. The spikes really do make it so much easier to tell when you are in focus and takes the guess work out. I remember trying to focus my DSLR before the mask and it was a nightmare (most of my photos where slightly out of focus).

It may seem a subtle difference looking at the diagrams but when you are using the mask it is obvious and no problems....I feel I should start getting pom poms out an doing a dance...pink tutu anyone?

Neil C

Link to comment
Share on other sites

It is a LOT easier...It may seem a subtle difference looking at the diagrams but when you are using the mask it is obvious and no problems....I feel I should start getting pom poms out an doing a dance...pink tutu anyone?

Neil C

That's a pretty strong testimonial Neil, I'll certainly look at acquiring a mask. At this stage focus is the main problem.

Did you buy a mask or construct your own?

old_eyes

Link to comment
Share on other sites

I'm hoping to try imaging after Xmas (if Santa brings the right kit!) and if I get anywhere close to the quality you've shown I'll be over the moon, so to speak :)

Good luck!

Getting anything is such a blast at this stage. No doubt I will become more critical with time, but for now it is all fun!

old_eyes

Link to comment
Share on other sites

Ditto what Neil says. I bought mine from a forum member, he maybe worth contacting in case he has any left, he is Psychobilly (Peter). They are also available on ebay etc.

They make a world of difference and it was my best focusing aid purchase...

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.