Chris Go 更进一步, 发现他的C14本身corrector不好导致不齐焦, 但是好的barlow可以补偿
见他的描述
Seeing improved on this second session of the night. Image are a lot sharper due to the new Barlow I am using. The reason why blue doesn't focus with the rest is not because of the previous Barlow, but because of the corrector of the SCT. It seems that the Astrophysics Advance Convertible Barlow corrects this problem! Now the blue is focused with the rest of the colors producing a sharper overall image!