Astronomy and DSLR Astrophotography Blog

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Dark nebula is a nebula in the galaxy which absorbs the light from the background. There are two types of them in general – one can be seen because they block the light of the emission nebulas in the background. One of the most spectalular of them is Horsehead nebula in Orion. The others block the light which comes from the stars behind them and those are best seen where the density of the stars is the highest – in the Milky Way. Dark nebulas consist of cold materia in the space, which is not hot enough to transmit the light.

In the night from 23th to 24th August I have gone to Bohor to take some photos of Elephant’s trunk, but I had to end taking photos about at midnight because the object passed the meridian and I couldn’t track it anymore. I had to make quick decision which object to capture the rest of the night and I choose the dark nebulas B334, 336-7 in Aquila, near Altair. I had no internet and I hadn’t a clue how this nebula looks like. Some of dark nebulas are really breath-taking and impressive (who doesn’t know Horsehead). Well, mine isn’t so spectacular, but I am pretty satisfied with the result. The next day I have checked the google image search for this nebula and found nothing, which means that I am one of the first who decided to “burn” his CMOS sensor on this object for some hours After all, that counts as well …

Here you go:

Some technical data about the exposure, equipment and so on:

Object: B334
Date and Location: 23. 8. 2009, Oslica, Bohor
Exposition: 26 x 5min
Camera: Canon 350D, Baader mod., ISO 800, RAW
Optics: Orion Optics Europa 20cm f/4.5
Mount: Vixen GP-DX SS2K
Autoguiding: SW 80/400 with QHY5
Processed in: Iris, Ps

astrophotography astrophotography, camera, canon, constellation, dark nebula, deep-sky, galaxy, milky way, nebula, stars

In the nights from 20th to 21st and 21st to 22nd August I have been capturing the Great Galaxy in Andromeda. I used my 8″ f/4.5 Newton which means 900mm of focal length and too small FOV to get the entire galaxy into one frame so I decided to make a mosaic. I spend the first night for the right part and second for the left part of the image. I combined them in Photoshop. All other data about image are:

Object: M31 and M32 (Andromeda Galaxy)
Date and Location: 20. and 21. 8. 2009, Mali Orehek, Slovenia
Exposition: 2×1 mosaic: 30 x 5min and 36 x 5min
Camera: Canon 350D, Baader mod., ISO 800, RAW
Optics: Orion Optics Europa 20cm f/4.5
Mount: Vixen GP-DX SS2K
Autoguiding: SW 80/400 with QHY5
Processed in: Iris, Ps

 

I hope you like it, I am very satisfied with the result. More is coming soon…

astrophotography astrophotography, constellation, deep-sky, galaxy, images, messier, stars

The last week I am very active, especially at night. From Thursday I already had 5 all-nighters, capturing M 31, B 334, IC 1396, NGC 7293, … and of course, the Meteors. I figured out that my backyard is just too light polluted, so now I am going capturing to the hill near me, Bohor. In the night from 24th to 25th August I made a timeplase of the night sky with me in the foreground, capturing DSOs. Unfortunately I have caught a meteor sporadic -5 magitude. The picture is so awsome, that I must share with you.

 

And here is the timelapse of the entire night. I have tagged the meteor:

I admit, I am lazy and that’s why I don’t finish up my Astrophotography Tutorial. I hope that I will find more inspiration, time and will to finish it up in September, because in October I start studying Physics at Ljubljana…

The images of the objects I listed above will be published here soon. As soons as I process them

CS!

astrophotography, personal astronomy, astrophotography, images, landscape, meteors, stars

The night from 12th to 13th August turned to be a little bit better than one before. The Moon was rising later and shining less. I had more luck as well. I caught at least 6 Perseids, I am attaching the most spectacular. The brightest object  right of the meteor is Jupiter:

I am going to observe tonight again if the weather is OK. We had some clouds yesterday after the midnight. I came home at 8.10 in the morning and I haven’t slept yet, that’s why this post is so short

personal astronomy, meteor shower, meteors, stars

I am not only deep-sky astrophotographer. Every year I take part of the biggest youth astronomy camp in Slovenia – MART. I never take telescope there, because it’s too large and I prefer observing meteors during the camp. Usually the camp lasts during the maximum of Perseids, but this year there’s a moon and it was lasting from 24th July to 2th August 2009.

Yesterday some of my friends from MART came to go to observe the Perseids. We planned to go to Bohor, which is a hill just 20 min drive from my house, but when we came to the place it overcasted. We checked the satellite images and decided to go South-West. It was a good decision. After 1-hour drive we found pretty good place to observe and started observing about at midnight. We had 6 DSLRs, capturing the Perseids as well. I haven’t got any really nice and bright meteor, like my friend did, but I ended with a timelapse of the night.

I came back to home at 6.30 and went to bed at 7.00. But today there will be another night with less moon and more Perseids. If you have an opportunity, take a walk tonight  and look up to the sky. I’m sure you will see one. My the best captured yesterday:

 

personal astronomy, landscape, meteor shower, meteors, moon, stars, trails

Yesterday I have received e-mail from Mathew, asking me about usefulness of SCT telescopes for deep-sky astrophotography. He agreed to reply to his question in this post, since this is pretty general question and others may find it useful too. Here’s his message:

“Hi,

My name is Mathew Oehler, and over the past several months I have become more interested in astrophotography, after having general photography as a hobby for about 6 years.

Last year a family friend was gracious enough to give me a 100mm Orion refractor telescope, and I have gotten excellent use out of it in viewing Saturn, Jupiter, and the Orion nebula among other things.  More recently I purchased a T-ring that enabled me to connect my Canon Rebel to the telescope, and was disappointed in its capability.  I would ideally like something designed to reach deeper, so I can get some clearer shots of nebulas and galaxies. I have heard that Schmidt-Cassegrain telescopes are designed for this purpose, but I’m having trouble finding good information amongst the sea of astrophotography information on the internet.  Are SC telescopes good for this, and will a standard one have an equatorial mount that I can put a motor onto?

Thank you in advance for any help you can provide me!”

The answer is not very simple (as always). The main reason why SCTs are so popular telescopes is their portability and compact size. They have a short optical tube because the light goes three times through it before it reaches the focus. The consequence is that they have long focal length comparing to diameter of the primary mirror which means slow optics (high f-ratio) – typically between f/8 and f/12. And here’s the catch! F-ratio is a king at photography because it tells you how many light the optics gathers per pixel. The lower f-ratio means more light, which means lower ISO setting (less noise) and shorter exposition to go deeper. This is the main reason why SCTs are not so good and popular among astrophotographers. In spite the fact they are compact, they have long focal length, small field of view (a lot of nebulas on the sky are larger than the diameter of the Moon) and require long exposition. Usually they come with mounts which are not capable to guide accurate enough to achieve pin-point stars at longer expositions (5min and more). All their characteristics suits for planetary and moon imaging, where longer focal lengths are needed and guiding is not so critical. On good mounts and with company of high detective CCD cameras they are good optical instruments for small planetary nebulas and galaxies, but I would highly dissuade this type of imaging the deep sky from beginners.

Mathew, I suppose that you have an achromatic telescope, because I have heard just good things about 100mm APO Orion refractor and it is good imaging instrument. I suggest you to start imaging at wide angle, since this is the easiest and the cheapest option. DSLR in combination with kit lens is good start point and your first object are star trails (if you don’t have a mount with tracking) or Milky Way (if you have the mount). It’s good to have in mind that you need to “build” your equipment from the ground, that means that first you need a good tripod, then mount and at the end the optics and camera. Note that good mount is astrophotographer’s best friend and it’s worth to buy a good one in the beginning, because you can put on whatever you want (just camera with kit lens or 16 inch RC). Later on you can buy a telephoto lens or APO middle-sized refractor which has many many objects in range (practically all the M catalogue and long list of NGC objects). If you are interested in little smaller objects you may find 8-10 inch f/4-f/6 high-quality Newton good instrument as well. At the end there are more exotic telescopes like SCTs, RCs which cost a fortune and need very expensive and good mounts (in range of 6000+ USD).

I hope I have answered to your question. You are welcome to leave a comment if I haven’t.

And if anyone have a question related to astrophotography just contact me. I’ll try my best to solve your problem …

equipment astrophotography, deep-sky, equipment, guide, milky way, sct, telescope

I think it’s not right always showing just the best works you produce. Sometimes it’s also good to represent worse pictures to show the world you also have troubles with everything and to encourage those who are not so good at astrophotography yet. I had a disaster last Thursday, capturing the Rho Ophiuchi region.

Last week we had some clear skies out here and on Thursday I decided to go to the near hill named Bohor to caputre the Rho Ophiuchi region, which is a large cloud of colorful nebulas, a part of Milky Way. June is the only month when this region is accessible to photograph from our latitude because it comes the highest on the night sky – about 20 degrees. Se we had clear skies, warm weather, no moon – perfect astrophotography conditions. I packed my mount Vixen GP-DX with SkySensor 2000 PC to the case with all the accessories and went to the Bohor to take some shots. I arrived there 2 hours before the astronomic night, prepared everything, aligned the mount, focused my modified Canon 350D with Canon 70-200 f/4.0 IS L lens and waited for the night. I started shooting at 23.45 LT. After first two shots I saw that everything works OK and went into the car, watching a movie for two hours. When  the film finished I was planning to take some darks and then to go home but when I checked the destination folder for images on my laptop I immediately noticed that something had gone wrong – THERE WERE JUST 6 PICTURES!!! OMG, I was awake till 4 a. m., getting just 6 frames. There was noting else to do, I had about half and hour till the dawn so I packed up the mount and everything and went home.

Nevertheless, on Sunday I decided give it a try and I processed the image. Honestly, I suspected to be worse, but it’s far from that I was planning to do. So here you have, Rho Ophiuchi nebula, not so perfect:

 

I hope that next time I will show something more attractive. And which are yours most common troubles you are dealing with?

Thanks for reading!

astrophotography, personal astrophotography, canon, deep-sky, images, milky way, nebula, stars

Yesterday evening it was clear outside and the Moon was rising at about 1.30 so I had 2 hours of total dark and this is enough for testing the new autoguiding camera QHY5. The target was M51, the second time. While I was deciding what to capture I realized that I will have to move to better location since from my backyard the southern sky is totally useless because of road lamps.

I managed to make a new cable for QHY5 so now it works with SkySensor autoguiding port. With that I decreased the number of cables from laptop to my mount from 5 to 3. Now I need only USB connection between PC and Camera, Bulb shutter release cable and USB connection with QHY5, which is great. I am planning to buy a new CCD for astrophotography so after that I will need only 2 cables. No more mess around the scope, finally!

So, I have just processed the image, the result is shown below:

 

I have also taken a shot of my equipment, at the “working” state

astrophotography, equipment astrophotography, autoguiding, camera, deep-sky, equipment, galaxy, images, mount, telescope

Finally I have more time. The exams are almost finished so I have three months of holidays now and I hope that I will take some good astrophotos in this time and post it here. I will also continue with Astrophotography Tutorial but for today I have prepared something more fresh. The last week I have ordered new autoguiding camera for my setup. The previous one, Atik ATK-2HS, was not mine actually so I decided to buy the new one. I have ordered QHY5 from UK, the astronomy store named Modern Astronomy. The shipment to Slovenia costed only 10 pounds and it took only 4 days to arrive.

The first impression was very positive! Even though it is “made in China” it looks very well designed and made. The build quality is on very high level. It is not plastic like Atik, but metallic. The original package comes with camera, T-2 to 1,25″ nosepiece adapter, USB cable and setup instructions. I have also ordered RJ-11 cable for direct autoguiding via camera.

I got impressed when I unscrewed the nosepiece because of the size of the CCD. It seems really huge comparing to tiny CCD detectors in webcams (Atik ATK-2HS also uses ordinary 640×480 one). The resolution is 1280 x 1024, more specification are available at the QHY website.

The best thing is that QHY5 has T-2 thread which perfectly fits to my autoguiding telescope so I can just screw it on.

As you can notice it has two ports in the back side. One is USB 2.0 port for connection with the computer and another is ST-4 compatible autoguiding port for direct connection with the mount. I am using Vixen SkySensor hand-controller and I though that it is compatible but in fact it isn’t, because Vixen uses it’s own standard for autoguding. The connector is the same but wires are connected differently so today I am going to make a new cable. The camera has also build-in red LED diode which is too bright and could be disturbing in a completely dark so I pasted a black stripe over it.

The camera comes with one A4 paper sheet of instructions how to setup. The drivers are not included, you have to download it from the Modern Astronomy site. The setup is really simple, you just install the generic driver and plug in the camera. Then you have to install additional driver for the autoguiding software you are using, in my case Guidemaster. All the main autoguiding software are supported, including ASCOM platform.

To sum up, I am very satisfied with the purchase. Two days ago I had a first light and everything worked fine. I was planning to capture M102 but ended with just 2 pictures because it clouded. This is 100% crop of one of them as a proof that camera guides OK:

I hope you enjoyed the review. If you have any questions don’t hesitate to ask under the comments

equipment, reviews astrophotography, autoguiding, camera, equipment, guide, mount, review, telescope

I haven’t been writing here for a while. Currently I am studying for my exams … but just one month left. Then I will continue with astrophotography tutorial. Nevertheless, I managed to take photography of galaxy M86 and neighbours last weekend. The picture was caputred with my standard setup: Orion Optics 8″ f/4.5, modded Canon 350D with IDAS LPS P2 filter at ISO 800, RAW on Vixen GP-DX mount. The photography is composition of 30 images, each of 5min. I was capturing from the backyard in front of a house where is a lot of light pollution.

I am very satisfied with the result because I have spent some nights outside recently without any useful pictures, because autoguiding wasnt’ working properly. I had to change some settings and now works again.

astrophotography astrophotography, deep-sky, galaxy, idas, images, messier, stars