30x or 40x eyepiece with EDIII (1 Viewer)

30x or 40x eyepiece with EDIII

I'm hoping a few of you have had experience of both of these eyepieces on the Fieldscope EDIII?

I was trying to decide which one to go for and was interested in the views of any of you who have used both of them?

I know from what I have read previously that the 30x eyepiece is highly praised on the EDIII but I was interested to know how the 40x eyepiece compares? Is there a noticable drop in brightness / FOV?

Which one do you prefer??

Thanks,

The Nikon website quotes the FOV on the 30x as 42m at 1000m and the 40x has a FOV of 31m at the same distance. It also gives the relative brightness of the two E/P's as 3.6 for the 30x and 2.3 for the 40x. Hope this helps. Maybe someone else can explain the meaning of the relative brightness figures.

This probably won't help much but I have a EDIII and and my eyepieces are 24XWA and 40XWA and the 20X60 zoom.

I primarily use the 40X eyepiece for scanning flocks of waterfowl and shorebirds. The 40x has a field that is about 10% less than the 20X has on the zoom.

Unless light conditions are really bad I have no problem with viewing with the 40X.

My primary use of the 24X is for identifying flying raptors on hawk watches.

If I were limited to one eyepiece it would be the 30X WA

This link will take you to Nikon's site on their eyepiece specs.

http://www.nikon.com/products/sportoptics/lineup/scopes/mc/index.htm

Thanks for your replies guys. I have a 40x EP on my larger diascope but I wasn't sure how the smaller Fieldscope would handle a similar mag EP? I think those figures help answer that question.

I think I'll go for the 30x EP as I've read a lot of positive comments on it...