nikon glass quality? (1 Viewer)

[woodhornbirder]

NIKON FIELDSCOPE WIDE MC EYEPIECE 40X, 60X, 75X

AM considering getting one of these, but I would like to know if they have rare earth glass eg lanthanum?

I know from my old scope, ed50 that nikon ep are good quality, but how do they compare vs pentax xw ? or vixen nlv ep ? or even televue nagler?

`FIELDSCOPE WIDE MC EYEPIECE` has 72 degree fov right? = same as pentax?

DOes exotic glass affect BOTH colour aberation AND brightness or just CA?

 

[RJM]

The Wide MC are sweet eyepieces and are as good as if not better than the Pentax XW with a flatter field and physically MUCH smaller too. No idea about the glass used in them.

The primary job of the eyepiece is magnify the image projected by the telescope lens. Most of the aberations you see like CA at the eyepiece are caused by the objective lens. The eyepiece itself cannot ENHANCE an image.

 

[mayoayo]

The Wide MC are sweet eyepieces and are as good as if not better than the Pentax XW with a flatter field and physically MUCH smaller too. No idea about the glass used in them.

The primary job of the eyepiece is magnify the image projected by the telescope lens. Most of the aberations you see like CA at the eyepiece are caused by the objective lens. The eyepiece itself cannot ENHANCE an image.

Not really true...as a matter of fact,most of the CA that You see in the image ,when using a nice sample,of a well corrected ED scope( or Fluorite),come from the eyepiece(I think is called Lateral Color)

 

[mooreorless]

http://www.birdforum.net/archive/index.php/t-126414.html

http://www.weatherman.com/darwinp.htm

http://www.skyandtelescope.com/equipment/basics/3311076.html?showAll=y&c=y