I think that's exactly right, Stan. Lens designers are quite smart. 

Godfrey


> On Nov 4, 2013, at 3:57 PM, Stan Halpin <[email protected]> wrote:
> 
> I've always assumed that the design compensation for a rear filter was a 
> trade-off. Such lenses tend to require huge (expensive) filters. So, rather 
> than make you bear the cost of expensive add-ons, they assume a (rear) filter 
> will be in place and compensate for it. And probably design a set of the 
> "necessary" high-quality filters that fit the drawer and conform to their 
> design. 

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