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I have an Ilex 8.5" f/4.8 Caltar Series S lens which does not have any filter threads. The outer diameter of the front element is 62mm so I think that it takes Series VIII filters. I've been referred to an ebay seller who carries a lot of filter stuff and he has a 63.5mm push on adapter which he says can be adjusted to fit, and a filter holder as well. What is the difference? I don't need an adapter to another size, so I would have though that a push-on adapter would just have threading for the filters. Could someone please describe to me how these things work? I'm used to the newfangled stuff that just screws in to the front of the lens! 
- Justin

- Justin