Lens Scope Converter?

Joined
Aug 12, 2005
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Broussard, LA, USA
Thanks for the link to Kevn cameras. When I win the lottery, I'll know where to go for cool stuff.

As for the rings of Saturn with a 400mm? Not likely. You would need to use a telescope eyepiece with a barlow and high powered eyepiece to see the rings of Saturn. That adapter was for terrestrial viewing. I don't think that the 400mm would make a bad telescope, just that the device you asked about wouldn't do it.
 
Joined
Aug 12, 2005
Messages
2,228
Location
Broussard, LA, USA
Well, if you already HAVE the lens, it doesn't cost a whole lot. But at only 4X power, a good pair of binoculars will have more ability to show detail of the moon, planets etc. The advantage of a 400mm f2.8 would be light gathering power. Looking at the Andromeda galaxy or any of hundreds of nebula would be fun.
 
Joined
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Australia
i thought the converter would turn my 400 into a 40x scope? with the TC20EII it would be an 80x scope?
 
B

Bill N

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I always thought 50mm was (1) one power? If that is true, on a 400mm you would have 80X and with a 2X you would have 160X. Or is my math bad once again?
 
Joined
Aug 12, 2005
Messages
2,228
Location
Broussard, LA, USA
The converter that KR lists has a 10mm eyepiece built in
Magnification = (Focal length of telescope [in mm]) / (Focal length of eyepiece [in mm]) . So 400mm/10mm=40x

That eyepiece in the old Nikon spotting scope converter looks pretty small. All that big beautiful glass viewed through a tiny objective is pretty much a waste.

If I were you, I would build up a converter with a nice 2" eyepiece. I googled "convert Nikon lens to telescope eyepiece" and found several people have done it.
Here is what a Canon guy did:
http://www.iscap.columbia.edu/jank/Photo/Info/Eyepiece_Adapter/index.html
Some people have said they think the Nikon lens might be able to focus to infinity if you use both a barlow (first) and a star diagonal (90 degree) together (but not one at a time).

Edited to add:
I found a premade adapter from this guy:
http://moggadapters.com/astro/adapter.asp
He only lists a 1.25" adapter, but that's going to be a whole lot brighter than the one Nikon used to make.
 
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