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filter for Mars?

filter for Mars?# Astronomy - 天文

j*k2003-07-06 07:07

1 楼

Just tried Mars last night, 2 AM. ST80, 4 mm. 100X. can not see anything
except it is a plate not a point. I have red, yellow, light green, light blue
filter. Which one should I use? I got only 15 min between cloud last night.
Photo tripod, switched between 25 mm, 10mm and 4mm. I have not time to try
filters. TIA.

z*j2003-07-06 07:07

2 楼

st80 is probably too small/fast for martian details. you'll need around 200x
or higher to comfortably see details. this kind of magnification is not
supported by st80, which is designed to be a portable widefield scope. (I use
an 8" dob, 9mm + barlow, which gives about 270x)

try

【在 j*k 的大作中提到】

: Just tried Mars last night, 2 AM. ST80, 4 mm. 100X. can not see anything
: except it is a plate not a point. I have red, yellow, light green, light blue
: filter. Which one should I use? I got only 15 min between cloud last night.
: Photo tripod, switched between 25 mm, 10mm and 4mm. I have not time to try
: filters. TIA.