Showing posts with label meade dsi. Show all posts
Showing posts with label meade dsi. Show all posts

Thursday, November 19, 2020

Comet Lovejoy and Open Clusters #2 Meade DSI

Comet C/2014 Q2 Lovejoy from April 2015 and accompanying open clusters were taken with the Meade DSI Color II. Quite a bit of noise is evident in these stretched images despite the use of dark frames. Not sure about exposure times. Recent an near future posted Meade DSI astro-images will be targets for future imaging with the ASI294MC Pro. 

Comet C2014 Q2 Lovejoy

Messier 41

M44

NGC1502

NGC1857
NGC2506

Wednesday, June 12, 2013

It's been a good two years since I posted here. I'm ashamed to  admit I forgot I created the blog. That's not to say I have abandoned the DSI-II. For some reason I no longer remember I stopped posting. Time to give it a renewed try. For the near future posts will catch up on past activities.

Meade no longer produces the DSI-II. There was a DSI-III which has been discontinued along with the full DSI line. In fact I was "lucky" to grab mine for a substantial discount as Meade was closing out the IIs. I put lucky in quotes because the DSI-II is a mixed blessing. It was cheap $290. It does work as you can see from the earlier images.

With its automatic dark frame subtraction it is easy to use. On the other hand the product is really poorly documented and the software interface is poorly designed. Meade left it to an enthusiast to create a video tutorial that is not done under the dark but none the less is more informative than the included documentation. The documentation does little to explain how to use the various settings or what many of them mean. This has been a recent pattern with Meade. The documentation for its Autostar

Whoever coded the software interface did not account for varying screen resolution. Thus the user must futz around with screen resolution settings on a high resolution laptop just to get a usable screen. The lack of temperature regulation is another source of frustration on nights when temperatures constantly change. One is forced to keep generating new sets of dark frames as the device cools along with the night air. A few users have modded their DSI-II with Peltier cooling. I'm not yet brave enough to try that.

Friday, June 17, 2011

Under a full moon

June 16 was just one day past full moon. Between 10 and 11PM the moon was still low to the southeast which offered a test for using the DSI-2 under fairly adverse conditions. Randolph, MA where I live is already very light polluted with poorly shielded sodium vapor lights. Adding to the challenge, the  local elementary school in whose parking lot I do my local observing has both broadband mercury vapor along with sodium vapor lighting.


Messier 3 just past full moon

After setting up the scope it took longer than usual to iterative align the 127ED because I forgot about the problems posed by using Arcturus or Spica as alignment stars. I need to recompile a list of compatible alignment stars which which differ between 3 and 9 hr away from Polaris in R.A.


I chose M3, which rides high in the sky this time of night to image. The globular cluster was obvious at 1s exposures in focus mode. After  creating a fresh set of darks for the night and merging with my old set of darks I acquired two sets of exposures at 2.8 and 4.0s. The 4.0s set were averaged to produce the final image after some histogram, brightness and contrast tweaking.

Sunday, June 12, 2011

A few nights in Maryland Part 2

Below is my first DSI-2 image of a galaxy Messier 51. M51 is near the end of the handle of the Big Dipper. As luck would have it a member of the Meade DSI Yahoo discussion group, Bill Rouse announced there is a new supernova or exploding star in M51 also supplying a link to before and after images. I didn't get a chance to image the galaxy until June 8th. Again I did not keep good exposure records. The red arrow in the post processed image points to the exploding star. Exposure was unguided which helps explains the oval shapes of the stars.