17 Feb
2013
17 Feb
'13
9:23 p.m.
Mat, I have 2 Chinese 5-inch achromats that need to have their focal lengths measured. Any interest in doing it at the ATM session on Saturday? If they are within about 2mm of each other, I'll turn them into a big binocular. If not, at least one of them will probably be for sale. I'll bring the new RFT and if the weather cooperates, we'll look at the mountains, and maybe the sun if I get a filter rigged up by then.