Quote:
Originally Posted by Krumlov
OK thanks. My next question is are all polarisers created equal. I have seen Andrews has name brand for $15 and Celestron for $69. Bintel have their name brand for $19. AOE have a set for $25. Astroshop have a Lumicon variable for $69. That is a quick selection. So are the $15 ones as good as the $70?
|
Hi,
Andrews sell the GSO ones but you need 2 of them and then you screw them together so they cost you $30, not $15. I am guessing the same applies to the BINTEL ones. The Lumicon one for $65 is the two filters already combined. I haven't used any of them so can't comment first hand. I have an Orion one which I don't think anyone sells in Australia any more. Optically it works very well.
As a generalisation you usually get what you pay for. ie The $80,000 Lexus and the $15,000 KIA both get you to the shopping centre ok. The Lexus will last somewhat longer and do it all a little nicer. Whilst the Lumicon filters are now made in the far east, they have been one of the benchmarks for astronomical filters for several decades and I would think their quality control will be somewhat tighter than on the cheaper filters. I am guessing the Lumicon would control stray reflections a little better than the cheaper ones and have better machining tolerances on the filter threads. Some of the cheap filters don't screw onto all eyepieces very well.
Cheers,
John B
