Tag Archives: astrophotography

Orion Nebula M42

The Orion Nebula must be one of the greatest objects in the night sky. At about 1,344 light years away it’s not close but it is visible to the naked eye as a fuzzy patch in the middle of Orion’s sword.

This nebula is difficult to photograph because of the large dynamic range in the image. The Trapezium is a group of bright stars that illuminate the nebula and the difference in brightness between these stars in the centre and the fainter clouds on the outside makes it hard to image and process the nebula in all its glory.

This image was taken at Rabbiter’s Hut in the Adelaide Hills on a dark night and processed from 5 light frames and 2 dark frames of 5 minutes each. I used the Orion ED80 (500mm focal length) and Canon 600D (modified). The Skywatcher EQ6-R was tracking on its own without any guiding but I do make an effort to get the polar alignment as accurate as practically possible.

Processing was normal with DSS and Lightroom 4.

Orion Nebula M42

Orion Nebula M42

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Rosette Nebula

Now that was a perfect long weekend!

New moon and dark skies far from the city lights for two nights.

I took a lot of photos with the new EQ6-R mount, Canon 600D (modified) camera, an Orion ED80 EON and a Meade 8″ SCT. There will be a lot of processing required over the next few weeks to get all the photos out. I experienced a lot of problems but that is par for the course by now.

The first photo is the Rosette Nebula. About 5,000 light years away and visually it’s about three times larger than the Orion Nebula.  Its is not bright and require a large telescope to see it under dark skies. If you want to take a photos of it, it is a great target, not too difficult and it is located high in the sky this time of year, just east of Orion.

This image was processed from 22 light frames and 6 dark frames of 2 minutes each. I used the Orion ED80 (500mm focal length) and Canon 600D (modified).

Processing was different this time. I had a lot of noise in the light frames and tried processing each individual frame in LightRoom 4 for noise reduction before I stacked all of them in DSS and processed further in LR4. What do you think?

Picture saved with settings applied.

  Rosette Nebula

“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 ……

Worm Wheel and Worm for anyone?

I am thinking of making some more worm wheels soon. My new lathe will be set up soon and it will allow me to make the worm wheels much quicker and hopefully more accurate.

If anybody is interested in ordering a specific worm wheel, please let me know and I will see what I can do. Send me your requirements ( starsinphotos@gmail.com ) with the size of the wheel (or the number of teeth. I suggest that you use an ACME thread as it does not bind as easily as a metric thread. I could also make the worm from an ACME threaded rod  (10mm diameter with a 2mm pitch) as shown in my blog.

I will look at your requirements and let you know if I can make it and then we can discuss a price that suits us both.

Updated 19 June 2016:  I have found that nothing is easy. The lathe is not quicker, if anything its harder to get it right. I will have to fine tune the production process before I can go into the business of selling worm gears. 🙂

Tracker 5 April 15-1149 Tracker 5 April 15-1148 Worm detail Jan15-1 2 x 130mm Al disks Tracker progress Jan15-1 IMG_1726