Filters for recessed 90mm f/6.8 Angulon

[Frank Petronio]

On the bay I picked up a well made stack of filter step-rings 52-77mm, with each popular size stepped. It's great because I can double them to use as pseudo-lenshades too. Bless those Chinese machinists...

[John Koehrer]

Hi Jeremy,
You might think about series 8 filters. The retaining ring screws directly into 67mm threads. All the series filters I've seen lately have been ridiculously cheap regardless of brand. The only concern is whether the filter would touch the front element.