Wanna make a scope? Or better still, grind a mirror yourself. Or, you have some good tips in making a really useful accessory? This is the place to show what your hands can do...
kingkong
Posts: 585 Joined: Wed Mar 24, 2004 4:33 pm
Location: Borneo
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by kingkong » Mon Sep 04, 2006 12:24 am
two questions, really:
1. the longer the dew shield the more effective it is. true or false?
2. anyone know how to work out the maximum length of extension of a dew shield (say, from the corrector plate) before it will cause vignetting in the scope's fov?
rlow
Posts: 2397 Joined: Fri Oct 31, 2003 7:36 pm
Location: Jurong
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by rlow » Mon Sep 04, 2006 1:55 am
Even with a dew shield on, the C8 corrector plate will still dew up on very cold nights. On such ocasions, dew heaters are still required.
kingkong
Posts: 585 Joined: Wed Mar 24, 2004 4:33 pm
Location: Borneo
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by kingkong » Mon Sep 04, 2006 2:49 am
r, thanks for the reminder. a diy-dew-heater-strip-that-wont-start-a-fire is in the plan, but one thing at a time. dew shield first. ;-)
anat
Posts: 479 Joined: Sun Jun 06, 2004 12:13 pm
Location: Bangkok
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by anat » Mon Sep 04, 2006 7:45 am
It is said "1.5 times the diameter".
Anat
kingkong
Posts: 585 Joined: Wed Mar 24, 2004 4:33 pm
Location: Borneo
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by kingkong » Mon Sep 04, 2006 11:21 am
thanks anat.
rlow
Posts: 2397 Joined: Fri Oct 31, 2003 7:36 pm
Location: Jurong
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by rlow » Mon Sep 04, 2006 1:14 pm
It is said "1.5 times the diameter".
That is just a rule of thumb. From my previous experience with my C8, I prefer to get one at least 2x.
kingkong
Posts: 585 Joined: Wed Mar 24, 2004 4:33 pm
Location: Borneo
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by kingkong » Mon Sep 04, 2006 7:19 pm
o.t. a little...
where can one buys nichrome wires? i'm hoping to use that instead of soldering resistors into parallel circuits...