In article <32502F64.314@erols.com>, jnrogers@erols.com says...

>Does anyone have or can anyone point me to a list of Nikkor filter
>numbers, descriptions and approximate filter factors ?

OK ("c" = multicoated): FF (stops lost)

- Skylight ------ L1A, L1B, L1Bc -- 1 (0)
- UV ------------ L39, L37, L37c -- 1 (0)
- Yellow lt. ---- Y44 ------------- 1.5 (1/2)
- Yellow med. --- Y48 ------------- 1.7 (2/3)
- Yellow dk. ---- Y52 ------------- 2 (1)
- Orange -------- O56 ------------- 3.5 (1 5/6)
- Red ----------- R60 ------------- 8 (3)
- Green lt. ----- XO -------------- 2 (1)
- Green dk. ----- X1 -------------- 5 (2 1/3)
- ND ------------ ND2X ------------ 2 (1)
- ND ------------ ND4X ------------ 4 (2)
- ND ------------ ND8X ------------ 8 (3)
- Amber lt. ----- A2 -------------- 1.2 (1/3)
- Amber dk. ----- A12 ------------- 2 (1)
- Blue lt. ------ B2 -------------- 1.2 (1/3)
- Blue med. ----- B8 -------------- 1.6 (2/3)
- Blue dk. ------ B12 ------------- 2.2 (1 1/6)

(From Nikon filter list enclosed with filters.)
Hope This Helps