![]() This would equate to around 21 and 26 UK pounds. I don’t know UK prices but a retail Australian suppler has a standard 90 degree diagonal for $39 and the ‘correct view’ unit for $49. (The other SCT’s till have the standard prisms.) I have one living on my C14 and another on the 150mm refractor. But for standard eyepieces, say 25mm focus and below, the drop off in light near the edges is not really apparent, and an oldie like me does not have to re-learn directions when I use a lunar map or find a star field or whatever. (the 45 degree one is even longer), and the light path is only about 20mm wide due to the nature of the prism. ![]() The downside is that the light path is 12mm longer than a standard prism. But consider the correct view 90 degree unit. Besides they are a pain at high altitudes. Those I have seen are not a great quality and exhibit flares across the field for bright object. Now, as far as the mirror reversed images are concerned (and they can be a pain), there are relatively cheap ‘correct view’ prism diagonals available. I can believe the complaints that there is a lot of spurious detail. The lunar detail really looks impressive, but it is largely unusable. I also bought ‘The Moon’ by Wilkins and Moore, (the book with the 300 inch map). Rukl’s book is good, but this map is ‘in my face’ every night if I need it. I originally bought it in the late 50’s/early 60’s.īeing a lunar observer (occultations mostly), I refer to it regularly for the odd identification and check of terminator etc. ![]() The text is written in a charmingly informal style, and it is clear that the authors are real enthusiasts - or lunatics, as they call themselves! I have been observing the Moon for over seventy years, and I have a great deal of lunar material, but this delightful and refreshing Atlas will have an honoured place in my library.' Patrick Moore, The Observatory '! a beautifully presented guide to observing lunar features with small telescopes ! an excellent photographic lunar day-by-day guide and I can certainly recommend it to owners of small telescopes and less-experienced observers.I have an Elger’s Map of the Moon on the wall of my observatory in a glass picture frame, that I put over an old watercolour, and it has ‘lived’ on the wall above the desk these last 39 years. Mike Brown, Popular Astronomy '! it is a splendid guide to identifying the various features I have never seen this better done. ![]() 'The concept of providing a day-by-day photographic guide for observing Lunar features throughout an entire Lunation, specifically aimed at owners of small telescopes, is excellent ! I recommend the book for those wishing to have a crash course on the Moon's features !'. We are happy to announce (Finally) the launch of the New free Version 8 of the Virtual Moon Atlas (VMA) that we have produced to honor the 20th anniversary of the VMA (Already) Since 2002 and its first release, VMA has been downloaded approximately 1.9 million times worldwide. Introduction The zero day Moon The 1st day Moon The 2nd day Moon The 3rd day Moon The 4th day Moon The 5th day Moon The 6th day Moon The 7th day Moon The 8th day Moon The 9th day Moon The 10th day Moon The 11th day Moon The 12th day Moon The 13th day Moon The 14th day Moon The 15th day Moon The 16th day Moon The 17th day Moon The 18th day Moon The 19th day Moon The 20th day Moon The 21st day Moon The 22nd day Moon The 23rd day Moon The 24th day Moon The 25th day Moon The 26th day Moon The 27th day Moon The 28th day Moon The 29th day Moon Further reading Acknowledgements Appendix 1: Phases of the Moon Appendix 2: Chronology of lunar selenography Appendix 3: Index of lunar named features. Selected lunar features are shown at high magnification to highlight and clearly illustrate certain regions and all lunar features are labelled using current IAU terminology. Whole Moon images are provided for each day of the 29-day lunar cycle, with labelled features and accompanying descriptive text. Day-by-day photographic guide to observing the features of the Moon through a small telescope. ![]()
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