I am new to reflectors, I've had refractors all my life. I've just purchased a 6" f/8 I'd like to use just for planetary. I have been reading about spiders and 3 vane vs 4, curved vs straight. My question; does the thickness of the vanes affect the quality of the diffraction spikes? My telescope comes with threaded rod vanes about 3/32"dia, what if I replaced those with rods 1/16"dia, or take it to an extreme, suspending the secondary with music wire under tension. If the diffraction spikes are ot all that effected by thickness of the vane, it may not be worth the effort. Anyone have any experience? Thanks in advance,
Hi Sean, I agree with Dave about the diffraction spikes for planetary viewing. You will get a smaller spike from a thinner vane but do be carefull that the secondary is well supported and stays collimated. Contast and Collimation are the key with planetary views. I saw a link for an apodizing mask I think in this forum which fits over the spider vanes and is supposed to minimize the spikes. I have a hard copy I can scan and email if you like. I have not tried it but it looks easy. Best improvements I made on my 8 inch F6.25 for planetary viewing was flocking the tube and getting a good observing chair.