Archive for : July, 2010

Stargazing Basics Book Review

Stargazing Basics BookStargazing Basics is a book for the beginner, it mainly covers what to look for when purchasing basic astronomy equipment including binoculars or your first telescope.

Stargazing Basics is divided into two main sections, the first describes the different types of telescopes you can buy and what to look for when purchasing binoculars. Every type of telescope is described, with a focus on those coming under a certain price bracket, in reality all those telescopes that you may choose when first making a purchase. But the first section is not just about telescopes, the book also briefly covers astronomy accessories which you may purchase at a later date.

Part two of the book entitled “What’s up There?” gives you an overview of the types of objects you may well see when using a beginner’s telescope. This is done using images and giving descriptions about the Moon, Sun, Planets, Nebulae, Galaxies, Stars etc.

There is a very large glossary at the rear of the book which takes up around 25 pages; this is a lot when the whole book is only 140 pages in total. But it can be very useful to have a glossary when you are starting out on as new topic and a lot of unknown words are used in the body of the book.

After the glossary there are some simple start charts you can use, as well as a list of the constellation names with descriptions.

Overall this is a very nice book for the beginner who wants to get into astronomy, it will certainly provide you with a lot of knowledge before you visit your local astronomy store and make a purchase of either binoculars or a telescope. Reading this book certainly would have helped me at the time.

It’s also nice to see that the author has not included images which represent objects what you won’t see through your first telescope. He has instead used his own images which mean you won’t be disheartened when you use your telescope for the first time and you don’t see in the eyepiece astronomy images like those produced by the big NASA telescopes.

Stargazing Basics is available at Waterstones

ISS and Russian Supply Module

Managed to get out and see the Russian supply module and the International Space Station travelling across the sky.

I was amazed to see them both travelling in perfect alignment across the sky, but the supply module was well in front of the ISS, by a long way.

This photo shows one line of the ISS and Russian supply module as both were travelling in the same line.

ISS and Russian Supply Module

Astronomik OIII CCD Filter Review

I have now moved over to collecting Astronomik filters, I did have a selection of both Baader and Astronomik filters. I have now settled on Astronomik filters for my narrowband filter set.  It’s important to always stick with the same brand of filters, as they should then all be parfocal.

But don’t get me wrong I still like Baader filters as I still have a fringe killer, uv/ir  and solar continuum filters from them.

The thing I like best about the Astronomik filters is how slim they are, and I never have any trouble screwing them into filter wheels, they also don’t catch on filter wheels like the height of the Baader filters.

Due to the cost of 2″ versions of filters I have gone with the 1.25″ range of filters, plus the filters wheels in the 1.25″ versions are also cheaper, this one was from StayFocused.eu

OIII CCD Filter The OIII CCD filter comes in the standard Astronomik no-frills box with a black foam backing. I was getting confused by the labels Astronomik put on their boxes, but now I think the white and black labels are the newer versions of the filters.

As the name suggests the OIII CCD filter comes with  a built-in IR-blocker up to 1150nm, so you don’t need an additional IR-blocker with this filter.

The Astronomik OIII CCD filter is a narrow band emission-line-filter for CCD photography. The filter lets the light of double ionized Oxygen of emission nebulae pass and blocks nearly the whole remainder of the spectrum where the CCD is sensitive.

The Astronomik OIII CCD increases the contrast between objects, in this case between the OIII emission line and the skyglow background. Our Astronomik OIII CCD completely suppresses the emission lines of artificial lighting (mercury (Hg) and sodium (Na)) and skyglow.

The full width at half maximum (FWHM) of 12 nm is optimal suitable for common CCD cameras and allows the use of very fast optics The optimal aperture ratio for the use of the filter is 1:3 to 1:15 with apertures of more than 6″ (150mm).

When using the Astronomik OIII CCD filter together with the H-alpha, OIII CCD and the SII CCD filters you can obtain three-color images of emission line objects (gas nebulae) from locations with very strong light pollution. To do so, you would take an image in three different wavelengths, select each one as a color-channel in Photoshop and paste them together as one single color image.

  • 95% transmission at 496nm (OIII)
  • 95% transmission at 501nm (OIII)
  • Full width at half maximum 12nm
  • Transmission from 494nm to 506nm
  • Parfocal with other Astronomik filters
  • Glass thickness: 1mm
  • Completely resistant against high humidity, scratches and aging effects
  • Diffraction limited, the filter will not reduce the optical performance of your telescope!
  • Astronomik filters are delivered in a high-quality, long lasting, filter box

Astronomik OIII filters and other Astronomik filters can be purchased from StayFocused.eu