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OIII Filter Help
Hi everyone, I'm currently considering an OIII filter for my 12" dob. I've decided to buy it in 1.25" format as my medium to high power eyepieces (100X magnification +) are in this format, making it more ideal for planetary nebulae. After this purchase, I plan to buy a 2" UHC filter (for low power, wide field viewing of nebulae). My questions are:
1. is there a difference in brand name? (I'm purchasing the Astronomik one)
2. should I get the UHC filter first?
3. how much of a difference does it make on planetary and diffuse nebs?
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