Range-rover
Veteran
Would a 40.5mm filter fit on a 35mm F2 lens or it has to be 40mm?
only a 40mm of the threaded type filter will fit on that lens.
And not all 40mm will fit. I have the Canon 35/2 and I found a couple of filters marked 40mm in my filter/junk drawer (I have a hundred filters) and they won't fit. Best advice is to simply forget filters. On the plus side the front element is recessed enough, and the lens isn't prone to flare, so you don't really need a hood. Another option (and I haven't tried it for this lens) is to get a gelatin filter, cut it small and tape it carefully to the rear element. I used to do this with some Nikon SLR lenses that filters either weren't available or too costly.
I frequently use stepping rings (adapter rings) in this way. The fact is that 40-40.5mm stepping rings seem to be easier to buy (and much cheaper costing only a buck or so) than 40mm filters as it is pretty much only Canon (that I know of) who used this diameter filter ring. Hence you are mostly stuck with using old original Canon filters which tend to be pricey because of their age and collectability.Would a 40.5mm filter fit on a 35mm F2 lens or it has to be 40mm?
And not all 40mm will fit. I have the Canon 35/2 and I found a couple of filters marked 40mm in my filter/junk drawer (I have a hundred filters) and they won't fit. Best advice is to simply forget filters. On the plus side the front element is recessed enough, and the lens isn't prone to flare, so you don't really need a hood. Another option (and I haven't tried it for this lens) is to get a gelatin filter, cut it small and tape it carefully to the rear element. I used to do this with some Nikon SLR lenses that filters either weren't available or too costly.
I use Marumi 40mm filters, they fit properly.
I’ll add another vote for a step-up ring. Alternatively, you could look for a threaded or slip-on Series VI adapter.
Everyone says buy a step-up ring. I've never been able to find a 40-40.5 step-up. Am I looking in all the wrong places?