Schneider recommends using an EW filter for this lens since the front lens eleme nt is too close and may be damaged by a regular size 67 filter. Bob Solomon (if I recall correctly) suggested to use Heliopan filter, cause they are spaced a li ttle further from the filter thread. Has anyone actually tried this and found th at indeed you can use Heliopan filters without damaging the Schneider lens?
Are there 67-67 "step-up" rings? Since all my other lenses have 67mm thread, I'd like to stay with that filter size if possible. Thanks!
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