Namibia offers clear Southern Skies for Imaging – Here is some Proof
We have been touting the benefits of a visit to Chile, in past articles on this blog, as a place to sample the joys of sky viewing in the Southern Hemisphere. Amateur astronomy is well established there, and European astronomical initiatives have established quite a footprint in the incredibly clear skies of the Atacama.
But we do not want to give the impression that it trumps other great locations south of the equator. So, we trolled the internet looking for another example. Our search had just one caveat: As this is an SBIG blog, we had to find an SBIG angle.
The Tivoli Southern Sky Guest House in the deserts of Namibia was happy to provide that angle! They had two images in their slide show taken with an STL -11000M. The first is of M83, taken by Eduard von Bergen. The second, of Centaurus A, is by von Bergen and Hansjörg Wälchli. Both men hail from Switzerland, and it is clear from Eduard’s site that he has led expeditions to Namibia multiple times.
Click on the image below to open a new window and start the show.
When you have a chance, if you live south of the equator, recommend to our community where excellent viewing can be found. Many of us travel, and make sky viewing opportunities a key factor in deciding where to go. Thank you!
Have you been to this guest farm? Would you be willing to share a few images that you took there? Let us know!
A selection of images taken at Namibia's Tivoli Southern Sky Guest Farm
Remember, we are happy to share an image of yours here on this blog. Click here for instructions.
Alan Holmes Reports on the Congreso Austral de Astrofotografia
This sculpture at the Observatorio Astronomico Andino points at the south celestial pole.
SBIG’s own Alan Holmes traveled to Santiago, Chile last November for the Congreso Austral de Astrofotografia. The event was organized by Daniel Verschatse, Alejandro Nunez, Guillermo Yanez and Diego Cartes. The conference took place at the European Southern Observatory (ESO), with a companion star party located at the beautiful facilities of the Observatorio Astronomico Andino.
To read Alan’s full travelogue and view the photographs he took to chronicle the adventure, click here.
Saving Money at the Telescope: The Real Story
Posted by Alan Holmes
An amateur interested in astrophotography has many options these days, such as modified webcams, high end digital SLR cameras, and cooled CCD cameras like ours. It does not surprise us that the amateur is often perplexed about what to buy, since good pictures taken by all of these choices can be found on the web. I hope the user can consider a few of the following points in making his purchase.
When pricing our astrophotography camera options, most of us forget to price in our most precious resource: Our time.
How much time do you want to waste each viewing night wrestling with cheaper equipment that may need more fiddling, more coddling? How many useless images do you want to struggle with as a percentage of good or even great images? How much frustration do you want to pack into your equipment bag to lug out to the viewing spot with you? How much (or little) support do you want from the manufacturer in getting the most out of your investment?
At SBIG, we never forget that your time is valuable. We work very hard to eliminate the frustrations and maximize the value you get out of each hour you spend imaging the night sky. We value your time as much as we value our own, because we are amateur astronomers like you, from the CEO on down. We understand what you seek to accomplish, and make our products to get you there more enjoyably and with better results.
Unpack the frustrations that come with cheaper cameras by packing in an SBIG camera instead.
OK. I will get off my soapbox and discuss some options in more detail!
High-end digital cameras: I have personally used a Canon 10D and was quite impressed with the images I obtained. There is an incredible amount of engineering in these products. It’s great that one can use them for general photography as well. However, they have no guiding capability, so one needs to acquire a guider to go with it. The filters are optimized for general photography, but several websites discuss how to remove the infrared blocking filter in the camera. Of course, after removing the infrared blocker, the color balance is bizzare on daylight scenes, so filter removal wrecks the camera for general photography. My opinion based on my limited experience is that these cameras are a great alternative to film astrophotography, but do not have a lot of the features that our cameras have incorporated to simplify the amateur’s task. In general, they have no focus mode, no guiding, no cooling, no shutter for taking dark frames, and, in the case of the 10D, required timing long exposures with a remote shutter release and a stopwatch. Most of the available software is not really optimized for astronomy, either. However, I don’t want to sound too negative – they are really a different type of product from ours that has substantial utility for astrophotography – just like a film camera.
Modified WebCams: Here I have stronger feelings. Most of these cameras have no cooling and were optimized for short exposures, but have been modified for longer exposures. They work, and the price is really attractive, but one is forced to sum a lot of short exposures to get a usable result on deep sky objects. They produce interesting results when used at fast F/numbers like F/3.3, where the sky background can overwhelm the read noise in exposures of 30 seconds or so, but will be disappointing at the slower F-ratios typically used when imaging the smaller objects in the sky. The results posted on the web for planets have been particularly impressive, where read noise is not such an issue. I have used these and found that I had to work pretty hard to capture what was, at the end of a half hour at the telescope and an hour of image processing, a mediocre deep sky image. If I had never taken an image before, I might have been impressed. However, an ST-402 image of similar exposure under the same conditions was dramatically better. Of course, ST-402s with color filters are more expensive, costing around $1495. I would like to point out, though, that for exposures under 5 minutes, the ST-402 will take an image the equal in sensitivity of our highly regarded STL-6303 and ST-10XME cameras – the quantum efficiency is the same, the filters are the same, the dark current is comparably suppressed, and one has a shutter for darks. Our CCDOPS software is highly optimized for astronomy, which REALLY helps. So, for $1495 you do not get a poorer camera, you get a smaller camera, with less pixels, but sensitivity as good as anything we sell.
Just for fun – an unguided ST-402 image of M42, the Orion Nebula, captured with an Orion Star Blast (4 inch aperture, 16 inch focal length - $169), mounted on a Losmandy G11 mount. This required a 30 second red, 30 second green, and 60 second blue exposure. CCD imaging is amazing!
Another point to consider is that the digital cameras and webcams are severely limited in what they can do – they are virtually all single shot color, with ambiguous digitization bit depths and unknown linearity. Our cameras all produce photometrically accurate data with careful use, and can be used by an amateur interested in participating in monitoring and search programs that are often described in the popular magazines. Lets face it – a modified webcam will never take a deep sky image to rival what can already be found all over the net, and after one realizes this after a few sessions at the telescope, discouragment will cause many to abandon the hobby. With our products you don’t have this ceiling – you can help professionals with many research opportunities, investigate spectroscopy, or use them as a highly sensitive guider. And, as I mentioned before, our larger cameras will not take better pictures of the smaller objects – you just get more sky around them.
But HEY – it’s your life! I am being a little facetious here, but the bottom line is it takes the same amount of time at the telescope regardless of which camera you use. Imaging can be a chore – dragging out the telescope and a table for the laptop, polar aligning, finding and focusing the object, taking a sequence of images while your fingers freeze, or the mosquitos feast, or something sneaks up on you from a nearby bush, and then tearing it all down in the early morning when you are tired, and spending considerable time processing the image to its limit the next day. Do you really want to save a few dollars on the camera, or do you want to know that you achieved the best image possible with your telescope and mount? Would you buy a car that would only go 55 miles an hour even if the price is very, very good?
The camera you buy today will last for years. Make the most of the precious hours you spend under a night sky by getting the right equipment the first time. As I noted above, we think your time has great value, and we value it like no other astrophotography camera manufacturer. That is why SBIG camera solutions give you superior images while simultaneously saving you time and minimizing frustrations. Folks say “you get what you pay for.” That goes in spades for astrophotography cameras!
SBIG cameras: Simply the Best Value for Serious Astronomers!
What Is the Appeal of Amateur Astronomy?
Posted by Alan Holmes
“Why do we amateur astronomers put ourselves through the physical and mental hardships of our hobby?”
How often have you asked yourself that question up in the middle of the night when struggling to keep pace with a moving night sky and keep ahead of the weather and the clock?
In the 24 years since Mike Barber and I first sat back and listened to the relays clicking on our ST-1 guider, I have often pondered the reasons behind the appeal of amateur astronomy and CCD imaging in general. Local bookstore sells picture books with beautiful celestial images. Why drag heavy equipment out into the cold darkness and sit through hour-long exposures to make our own? After asking that question a bunch of times myself, I came to the conclusion that astronomy is a lot like traveling. One can buy fascinating books with pictures of the Egyptian pyramids, for example, but looking at the book is not the same as going in person.
Pictures are worth 1000 words, but still don't tell the whole story (Image courtesy of 1.BP.blogspot.com)
I once had an opportunity to visit the pyramids during an eclipse trip in 2006. The first thing you notice when you get to the pyramids is the pervasive smell of camel dung. Then you encounter the very pushy postcard salesmen, the camel ride vendors, the huge tour buses that try to run you down when you step into the street to get that good picture, the heat, the dust, and the bad case of sunburn coming on. You become incensed at the carloads of men wolf-whistling at your wife who made the mistake of wearing shorts in 100 degree weather. You see the sweat running down the face of the tourist police who have to wear their heavy fabric uniforms buttoned at the collar year round because if they don’t, ten other men are lined up waiting to take their job. You will marvel that for the entire huge Giza pyramid site there is only one toilet for men (upstairs in the solar boat museum). And strangely enough, I enjoyed every minute of it! The point is – the picture itself is not the whole story! The experience of creating your own personal “image,” with your own story to go with it, is what makes everything special.
This is, I think, the essence of amateur astronomy: The picture in the book does not give you insight into the real brightness of the object, its size, and the subtlety of the detail. Nor can you appreciate fully the picture in the book without having attempted it yourself, and learned the challenges implicit in producing a very good image. Not only that, scientific astronomical observations also offer a unique perspective only available to the serious traveler.
The first time I captured the spectrum of M82, I noticed the H-alpha lines near the center were noticeably shifted, relative to each other, evidence of the titanic velocities near the exploding core. I detected the rotation of Saturn’s rings, and the red shift of a distant galaxy.
You read about this stuff, but actually seeing it in your own data “brings it home”, to use some American slang – it makes it real. This is what I love about amateur astronomy – it is like traveling to gain that individual insight and perspective that those who don’t travel never get, but you can do it all from your backyard, at least for half the sky. And here’s more good news: It probably costs less than a trip to Egypt!