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Secondary size?
Hi everyone
I need to buy a new secondary mirror as mine was damaged. I have a 3.1” at the moment, I’m just seeing if getting a 3.5” will be better. I have an 18” F/5 primary, focal length is 2308mm, from primary to diagonal is 1998mm and from diagonal to eyepiece is 310mm. I’ve been playing around with Newt but I don’t understand some things on there. I’m just seeing if I would benefit from getting a bigger secondary. I’m just going to buy a GSO one from Agena, I’m pretty sure they are 1/4 wave. I’ve seen 1/10 wave on eBay. Does the wave make a big difference with secondary mirrors? I know price is different. I hope someone can help with these questions. Thanks everyone
Daniel
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