review Digital Astrophotography : A Guide to capturing the Cosmos

Digital Astrophotography : A Guide to capturing the Cosmos
reviewed by Dr. Eric Flescher, Olathe, KS: (dreric1kansas@aol.com)

Author: Stefan Setp
website: http://www.photomeeting.de/astromeeting/_index.htm
Publisher: Oreilly Media, , Inc. ,1005 Gravenstein Highway North, Sebastopol, CA 9547
Released: 2008
Pages: 155
$30 USA
$33 Canada
ISBN 10: 1-933952-16-4 |
ISBN 13:9781933952161

Strengths: Provides solid information about using equipment, cameras and resources for astrodigital photography. Good examples of his masterful astrophotos. Descriptive information and guide oriented information for Registax and Astroart image processing software. Colorful photo and screenshots.

Weaknesses: No index. Glossary of resources should have been indexed and have additional information about each item. Some of the screenshots are too small to read. Screenshots do not have additional circles, arrows and other visuals “ to zone in on” which parts of the screen instructions go with the text. Guide information is “jumbled” together in paragraph form instead of being spread out , numbered and being easier to read. The author uses Astroart, a commercially available program. If you use another program ( for example one listed in the Resources section) for stacking and image processing, you will have to either find your own manual or use the information to try to piece together the information about using image processing. Novice astrophotographers may need to consult other camera, astronomy and image editing resources and information.


novice/ Intermediate/Advanced

Rating: 4/5

Introduction

The Starry skies and observing the stars have captured our imagination since ancient times. Observing and records came first and then sketching was available. Photographing on film the heavens was a great step forward. Presently the use of digital cameras and equipment are the rage. Amateur astronomers are increasingly using digital devices to “capture” the heavenly objects and events. One noted astronomer and photography has provided a guide book to help you with your digital photography: Digital Astrophotography : A Guide to capturing the Cosmos.

The author is a celebrated astrophotographer for many years. His knowledge and his astronomical photographs are displayed on his website which is well stocked with many brilliant photos. I was interested to see how much of his knowledge could be “communicated” in this book, so that myself and others could learn about the technigues and information that has brought these brilliant photos to fruition.

The author provide information about hardware, software, methods and techniques. Chapter 1 “Before you start” offers a welcome introduction to starting out with this hobby. It starts from “ the ground up” so novice astrophotographers will find the information well suited for them as well. There is a good solid information and ideas about browsing, choosing and working with simple compact digital camera, tripods and telescopes

Chapter 2, digital compact camera are introduced.
Chapter 3 has webcam information and explains the advantages and disadvantages of the overall use for astrophotography. The more popular webcams available market (ex. Phillips Toucam and four others are listed with photographs) but there is no information what are the “pros and cons “ of each. The author elaborates on using the free (PC) programs called Registax which is a fine program. However this software could also be used with digital cameras and equipment but this was not mentioned.

This part of the book also has a good instruction on the use of avi files for processing your video to images (don’t know what that is then you will have to consult other information). Websites where these webcams can be found are listed in the resources section but you will have to hunt for them as these are no segregated. There is a section on fine tuning with photoshop (p.58-59) but the information does not include additional processing (using photoshop) such as unsharp mask (which I did actually find is in another section (p.86) with DSLR. This is where a good index would have helped.

In Chapter 4, digital cameras is the main focus of information. Using a DSLR camera to shoot the Sun, Moon, stars, star clusters, and nebulae while attached to your telescope are discussed. The digital lens reflex camera demonstrated in this chapter is the Canon Rebel XT (which is what I use as well). However this chapter does not include additional information concerning the differences between using the XT model and the newer XTi model. Other cameras are listed in the resources section however non- canon users will have to consult their manual, manufacturer’s website (see resource guide) or another book to learn all about their DSLR (digital single lens reflex) camera. Maybe it does have to be told but it is important before using this book and this chapter, that you know and be comfortable using your camera first so that you will be ready for the assistance laid out in the astronomically oriented chapter in Chapter 5. It is tough to cover everything but as I looked through this chapter I found that important information was missing.

I found the lack of credible and informative techniques and information concerning the using of the cameras bulb extended time exposure, a little mystifying. In addition some of the equipment is a little dated. For example, it is a good idea to use a device to automatically snapping your shutter without having to touch the camera yourself. There are remote cords that can do this (for canon and other cameras). However nothing was expressed about the use of remotes that use infrared (which I have and use) and are even better for remote work.

Chapter 5, the astronomical CCD camera, using charge-coupled device (CCD) and camera assists with learning about these nice instrument. This chapter has a nice section regarding the use of dark frames (p. 118). Helpful fine explanations as well as the importance for using these with your photos and FITS formats are well explained. Flat field and bias frames also are helpful to know.

There is a nice glossary of important terms used throughout the book. The Appendix, has a nice listing of application areas for digital astrophotography as applied to equipment and the celestial sights we can see and image. However this nice chart does not integrate itself well into the chapters. In addition, I have enjoyed photographing many comets but such celestial wonders are missing from this listing and any part of the book.

A Resources section has a number of image processing software program listed (non alphabetically listed in the titles). These are all “mixed-up” together in the listing and not categorized (according to image processing, software, image manipulation, video capture etc).I was a little perplexed to find that Starry Night Pro software (which I use), is listed as “image processing software”, which it is not.

The main tool for image editing is called Astroart which is a PC (only no Macintosh) based commercial program (p. 122 -132). A fine program in its own right, the author helps you learn the program. There are screenshots to help in the process (the sizing is better then in other parts of the book) but once again the author does not use highlighting symbols (arrows, red circles, numbering system etc) to go along with the instruction. Astroart is the only other program to use (along with registax) if you are looking for a free based program . You can use (the free) Registax (have to look up what kind of PC needed but not here) with your PC.

Throughout the book and the chapters there is too much “verbosity” with the instructions. There are guided steps and instructions but these are all “mashed” together in long paragraphs without ample space. This makes the reading a little tedious.

The step by step processes would have been easier to understand and easier to read if a numbering systems was used or separations. More space in between the instructions would help in the integration with the visual screenshots as well. Screenshots do not have additional circles, arrows and other visuals to zone in on which parts of the screen instructions go with the text.

I was disappointed in the resource section which is not concise enough. The are jumbled together with software, applications and other resources all together. Each does not have much information. There is nothing that is said whether some of the software is for macintosh or windows or both. In addition, the cover has a beautiful photograph of a total solar eclipse (that he took no doubt additional information is nowhere to be found). I had to go into his website to figure out where it was. I would have liked more information about filters, what kind of exposures for lunar and solar eclipses etc or at least an explanation where additional information could be found.

Most astrophotography and image processing books and tutorial type books offer an index of specific categories and titles found in the book. What I found to be an unforgivable omission is the lack of an index. While the chapters are fine, it would have been nice to have specific topics listed in an index.

Conclusions

When it comes to digital astrophotography for me, I am always looking for more insights and information that will “put it all together”. I am always searching, like others, to make my photos, the best they can be. While I have had astronomical photos published in Astronomy magazine and my web blogs and websites, I still have a lot of room for improvement.

Many amateur astronomers who are becoming acquainted with various photographic devices are taking advantage and using them for their astronomical photographic work. There are bits and pieces from this book that I can use but I wanted “more”. I did not expect this book to be the all-in-one resource guide on everything digital astrophotography for me. While the author is a fine astrophotographer and has compiled a good a wealth of techniques, ideas and information involved image processing, I still need to search for more.

This book is great for those looking for equipment to use and sorting out there choices for how and what ways their astrophotography endeavors can start and develop. It is a fine resource. But the book, might not be what you want. Possibly you already have all the equipment you have or need.

If you don’t plan to use the Astroart program, a cornerstone in this author’s tutorial explanations for image processing, you will need to find another program ( for example one listed in the Resources section), for stacking and image processing. But if you buy this book , then you have the option to either find your own manual or use the information that comes with the software, to “piece together” the image processing techniques. In addition, most of the book can be used to help MacIntosh astronomy hobbyists but several of the better image processing program for MacIntosh are not listed in the resource section. Macintosh users can use the PC software with their Intel newer MacIntosh computers but this is not mentioned.

I like most of the book and what it “has to say.” However the index omission, the haphazard resource listing and the focusing upon Astroart as the sole basis for image processing instruction just disappointed me. I wonder why Registax is only application used for webcams? Couldn’t Registax could be used withCCD imaging (chapter). I can work these pieces of software on my older Compaq and in that way I will learn more. But still I am working towards using my Macintosh for image processing that will elevate my astrophotography skills while using this book.

This book is still a good resource in many regards. Perhaps the next version of this book will be improved on some of the concerns I mentioned. Some astronomy enthusiasts looking for answers to their astrophotography questions will like this book as is. However I suggest before you buy this book, check it out and see that it has what you want and if the book can help you. That is better then being disappointed when the shipment arrives. That way you can choose another astronomy digital processing books that can meet your your image processing better.