Last updated: 13 September 2005
Subject: Baader Neodymium Moon and Skyglow Filter - Review Sent: Sunday, September 11, 2005 17:09:24 From: Miles (firstname.lastname@example.org) Here is a review you might like to add the accessories / filters section. Product : Neodymium Moon and Skyglow Filter Manufacturer : Baader Planetarium Price paid : 26 GDP, bought in the U.K. The attraction for this filter is its low price put up against the claims of what it can do, its almost as cheap as some colour filters. I bought it to use on an ETX 105. It is advertised primarily as a filter to cut out light pollution from sodium lamps, while boosting contrast, and the notes that come with it offer various general uses, thanks apparently to the properties of neodymium. Against the orange glow of street lamps it does a good job, not spectacular, but in low power eyepieces it helps to make the surrounding space more black, and offers more contrast. This helps give a satisfying, aesthetically pleasing view, though it does not significantly help in finding DSO's. However on already bright objects like open clusters it can really help to let you fall into the image. The double cluster in Perseus, and the 'Wild Duck' cluster all looked more colourful and contrasty. With higher magnifications however there eventually appears a cross-over point when even the slight light loss cancels out any beneficial effects. Obviously with larger scopes this is not an issue. I have no experience of other broadband or LPR filters, and It is difficult to predict when it will work best, and what objects will benefit most, but overall its almost a good enough effect to keep it permanently attached to the 26mm meade plossl - given that those sodium lamps are never switched off! On Jupiter it pretty much did what the blurb said, increasing the contrast, reducing glare and helping detail stand out. Views of the moon also benefit by appearing more 'black and white', and you can pretty much use it as a ' moon filter' - certainly at high powers. On Saturn no enhancement was noted, and the blue colour cast was distracting. Great claims however are made about Mars, so its a good time to test it out. Without the filter Mars can appear as a glarey almost featureless disc, almost too bright, but with the filter the glare is reduced and dark features can be made out. This is a good result, and it is always used from now on with a 6.7 or 5mm lens - a great aid for this 2005 opposition. So its sort of a jack of all trades - and master of one - improving contrast, and this effect just for Jupiter and Mars is worth the price for planetary observers. Overall, it is a nice useful well made bit of kit to have in the box, and a good introduction to what filters can and cannot do. Best Wishes Miles Glen
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