Kokusai Kohki 20mm Widescan III

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Brand and Model:Kokusai Kohki 20mm Widescan III
Price ($USD):209
Type:Misc Wide Angle
Focal Length:20mm mm
Barrel Size:1.25
Apparent FOV:84.0 degrees
Field Stop Dia.:0.0 mm
Eye Relief:12 mm
Weight (lbs):0.4

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Kokusai Kohki 20mm Widescan III
Not bad but you get what you pay for. In my f/10 108mm Newtonian there was significant off axis aberration--Polaris could not be split as you moved off axis. f/10 is pretty free of lots of Newtonian aberration. By contrast the much pricier 24 Pan Optic made a big difference. The widescan III made the small newt feel like a cheap scope (it's not). The 24 Pan let the optical qualities of the scope perform.

Overall Rating: 6
Optics:6 Value:6
Weight: 5 (Veritable Vote)
Link to this vote: http://www.excelsis.com/1.0/displayvote.php?voteid=507157

Kokusai Kohki 20mm Widescan III
This is a very very good eyepiece, it replaces my 32mm Plossl, 40mm Plossl and a 20mm Plossl all at once. It's parfocal with the ToUCam Pro which is a big plus for centering objects.

With my C8, Sky90 and Ranger, it performs well. Stars are not perfect at the very outer edge, but I found myself not looking at those places at all, except otherwise for better framing of object. It's silly to put Jupiter that far out to observe!

I end up buying another one to use it in my binoviewer, great eyepiece at a very very reasonable price. Optically it could be better like a Nagler, but there's no 1.25" 20mm Nagler anyway!

Eye relief is very good, and it is so light in weight!

Overall Rating: 10
Optics:9 Value:10
Weight: 1 (Unreliable Vote)
Link to this vote: http://www.excelsis.com/1.0/displayvote.php?voteid=347811

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