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Thanks!

Does anyone know what makes a lens able to handle a certain f stop? And how do you figure out what size opening is needed for an f-stop? Is there a formula for caluculating it? Edmonds ...

Thanks for answering my question. To answer your question the asking price is about $150 and it's in an no.3 Acme synchro shutter. I have to admit I haven't heard of that shutter either... Any ...

I have an opportunity to buy a

215mm f4.8 Ilex Acuton Lens No.690

It's only available to me for the next day or so. Has anyone had any experience with this lens? Good, bad or otherwise? Any ...