Tag Archives: adelaide

Milky Way

Every amateur astronomer knows that the clouds will roll in as the delivery man’s van leaves your front door.  This happened to me again these last two weeks.

I treated myself to a new ZWO ASI224MC camera with a Canon lens adapter, all purchased online from Bintel. Very small and compact and it is intended to help me with my polar alignment, guiding and some planetary imaging. It’s main advantage is its very low read noise which means that you can take many short images and add the individual image frames in post processing to form a longer duration image without adding significant noise in the process. I’m not planning any huge expansion into planetary astrophotography but it would be nice to have something to do when the moon is up and I cannot do long exposure, deep sky stuff.

ZWO-New-ASI120MC-Camera-

ZWO T2 to EOS Adapter

Last night was clear with the Moon and Jupiter right overhead and I started everything up; EQ6-R mount with the ZWO ASI224MC camera on a Canon 60mm EFS lens. For the software I used Sharpcap Pro, it will cost you 10 pounds annually to get the Pro version that lets you do polar alignment. This works very well and will work with any camera that is recognized by Sharpcap. Also read one of my previous posts about SparkoCam.

Sharpcap Polar Alignment

You just follow instructions and move the mount az and alt adjustments to get the polar axis of the mount perfectly on the celestial pole. No guessing or frustration and a perfect result. That’s worth more than 10 pounds!

My first attempts at using the ASI224MC camera with an Orion EON 80ED on the moon and Jupiter was not great, I have a lot of learning to do and I did not spend a lot of time trying. Just a quick picture of the moon…

Moon ASI224MC ED80

I then took a number of images of the Milky Way with my modified Canon 600D with a Canon 60mm EFS lens directly on the mount and took a series of 60 images of (quite short) 30 seconds exposures at f3.2 and 400ASA as well as a number of dark frames of whatever was directly overhead at the time. It happened to be the center of our galaxy. As usual, combined with Deep Sky Stacker and processed with LR4. I was sitting inside on the sofa nice and warm, watching a movie while Magic Lantern was managing the camera outside in the cold. Did I mention that it was cold?

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“First Light” for EQ6-R

I used the new laser alignment tool last night and it took me about 2 minutes to achieve polar alignment for the EQ6-R. I then used a 1-star alignment to get the mount setup.

To test, I used my trusty Canon 600D (modified) with a Sigma APO 120-400mm at 400mm and f/5.6 for a single 3 minute exposure. This is not a lens that I would normally use for astrophotography but I wanted a long focal length to test the alignment and tracking.

Well, let’s say that I was not disappointed with the result.The following image of the Carina Nebula is an unguided 3 minutes exposure at 400mm and there is not a trace of star trials, even when zoomed in. Take a look….

Carina Nebula - Test Image

Carina Nebula – Test Image

De-Forking a Meade 8″ SCT OTA

This sound a bit obscene but I promise that no animals, people or telescopes were harmed in the process.

The Meade SCT in question is an 8″  2080 model that I purchased around 1992. I used it quite a bit for a number of years until my interest turned to astrophotography. The specific model do not have a dec motor and the RA motor is running off 240VAC.

img_2775Over time I build an invertor that could work from AC or 12VDC and allowed me to vary the frequency  around the nominal 50Hz and I could therefore do some manual guiding in RA with a set of buttons and with the existing fine controls on the DEC. It worked a treat for a while but anybody that has guided long exposures manually will know that its a very tedious exercise with unpredictable results.

Well, now everything has changed. The new Skywatcher EQ6-R can easily carry the 8″ OTA (Optical Tube Assembly) as well as my ED 80mm and new opportunities becomes available.

I had to de-fork the OTA out of the Meade fork mount to allow me to fit a Losmandy plate to allow for the OTA to be fitted to the EQ6-R. There are a lot of guidance on the web for how to do this but I used the following site:

http://uncle-rods.blogspot.com.au/search?q=getting+deforked

Its remarkable easy and took no time at all.

Loosen two bolts on one of the arms first.

img_2778

Then remove three small bolts from each side of the tube. Take care to work on a soft surface and have someone assist you to make sure you don’t scratch the tube surface.img_2779

And its off!img_2780

Now to mount the Losmandy DM8 kit into the existing holes on the OTA.img_2783

10 minutes later…img_2784 img_2785 img_2786

And now the amazing Meade 8″ OTA can be used on a very capable and accurate mount. A big change for me and there should be some new images soon.

img_2788With my luck it will probably be cloudy and rainy for a month now ….

Unpacking the SkyWatcher EQ6-R mount

The EQ6-R has arrived on Thursday and I unpacked it that night. No surprises there….

Here are some photos of the process:

img_2751 img_2753 img_2754 img_2755img_2756 img_2757 img_2758The handle makes it easy to lift the mount head with one hand.img_2759 img_2762The adjustments bolts look quite solid, at least 15mm on the main altitude bolt and 12mm on the other three.img_2766 img_2767Saddle takes Vixen and Losmandy.img_2768 Probably not many changes visible here on the cable panel except for the power connector that is now a solid screw on type.img_2769 img_2770Synscan loaded with version 04.37.03.

img_2772 img_2773 img_2774Waiting for the weekend now and a mounting plate for my Orion ED 80mm EON and also a Losmandy DM8  dovetail plate for my Meade 8″ SCT.

SkyWatcher EQ6-R mount

Well, I have finally surrendered to the temptation of getting myself a heavy mount.

Initially I was looking at the Skywatcher NEQ6 Pro but then discovered that the brand new Skywatcher EQ6-R mount is available on a limited product release from an Aussie supplier. Major changes are the belt driven system with zero backlash, PPEC support, newer motor drive with lower periodic error, improved tracking accuracy, 20kg payload capacity and a carrying handle!

skywatcher_eq6r

Basic specs are as follows:

eq6-r-specs

Will be delivered next week so expect more feedback here soon ……

Carina Nebula from under a streetlamp

I had to test my new tracker with autoguiding and could not get away to a dark site so I decided to test it in the front garden where I could reach further south towards Carina Nebula. Unfortunately I have a bright streetlamp in front of my house. I tried to shield the light from falling on the camera and lens to avoid the worst effects of the light conditions. I use a modified Canon 350D and got 29 light frames of 30 seconds each, 7 dark frames and 18 bias frames at f/5.6, ISO 800 with a 250mm focal length.  Ideally you would try to get longer exposures than 30 seconds but the sky was so bright that I had to limit the exposure time for each frame.

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