Another ? for Floyd

Hi Floyd,
I saw your picture at Mt. Pinos and noticed the aperture stop on your dob. Do you use this much and does it help on poor seeing nights? Not that you get as many nights of mediocre seeing in California like we get here in the Michigan. :S

Hi Jim,
Like most things, the aperture mask has its moments. Sometimes you want to tone things down a little without a filter, like a planet or a double star like Sirius. This can help, but I do not use it that much, it serves as a dust cover much of the time. But it is useful, so I keep it.