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Beginner Question: Why 2" Color Filters So Hard To Find?

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Posted by Michael P. Smith/">Michael P. Smith on September 8, 1999 04:44:17 UTC

I am fairly new to astronomy so please forgive me for asking this silly question. My general interest is in deep-sky observing, however I am some what interested in planetary/lunar observing. That being the case, I have primarily invested in 2" eyepieces. I now find myself in an awkward position. I have a good selection of 2" eyepieces and barlows, but I cannot find 2" color/lunar filters. That forces me to spend more money getting 1.25" eyepieces just so that I can get the color/lunar filters I can use.

In my ignorance, I thought that 2" filters would simply be a little more expensive than 1.25" filters. I had no idea that they would be so difficult to find. The ONLY 2" filters I have been able to find are 4 color filters from Orion. Not exactly a wide selection.

So it begs the questions. Why are 2" color/lunar filters nearly impossible to find? Is there some obscure reason why 2" eyepieces are bad for planetary or lunar observation.

Michael P. Smith Neophyte Astronomer

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