.....     Guide to thread pitches used throughout the site

ES   European standard male threads 0.75 standard threads today

E     European fine male threads 0.5: for older cameras

F     fine male threads 0.5mm between threads - same as E

C     Coarse male threads 1.0

M     medium male threads 0.75... standard threads today

AS   American Standard 0.72 (prior to 1965)

SO   slip-on (over lens barrel)

SS   set screw (tightens over lens barrel)

FR    fine (0.5) female

MR   med (0.75) female

NFT  slim > no front threads


      Guide to condition of filters for sale


           All filters are “new stock” unless indicated with these designations:

u/m..used, mint condition - no flaws.

n/o...new filters but old stock, older packaging.

       (n/o B+W and Heliopan filters are non-slim)

vg...used, good glass, some wear on frame

cs...  with original leather or plastic case

unmtd...unmounted glass


        All B+W, Heliopan and Nikon filters are black anodized brass.

        All other round filters are black anodized aluminum unless “chrome”.


Linear Polarizers are for older film cameras with manual focus and metering.

Circular Polarizers are for auto function cameras.









Filters for Black & White photography

Filter basics for Digital photography...or film

Filters for color Film photography

  ND Grads

Getting started: using filters with Digital Photography

Guide to Neutral Densitys

ND Wratten #     Filter factor   Increase exposure stops

  0.1                         1.25                         1/3

  0.2                         1.50                         2/3

  0.3                         2x                               1

  0.4                         2.5                           1-1/3

  0.5                         3                              1-2/3

  0.6                         4x                               2

  0.7                         5                              2-1/3

  0.8                         6                              2-2/3

  0.9                         8x                              3

  1.0                         10                            3-1/3

  2.0                         100                           6-2/3

  3.0                         1000                         10

  4.0                         10k                           13-1/3