That is not the way I would go. I would buy a Cokin filter system. Get a adapter that fits the largest mm lens you have. Then all you have to do if you buy another lens is purchase a new adapter for that lens. The adapter is attached to the holder that the filters fit in and a lens hood attached to the filter area. Make sure you get a large enough system before you start.

Some sales people are not as up to date as they should be. Something to think about. Watch out for vinetting when you add filters on a W/A lens. It can cause you greef. To check set the lens to it's smallest f stop look through the back of the camera if you can see the lens hood it will be in the picture...

I hadn't considered that. I've been browsing their web site, and checking prices on B&H Photo. There are plenty of inexpensive filters for it, but it looks like the polarizer is even more expensive that the B+W or Heliopan screw mount filters (and I thought those are expensive). This should be fairly easy, but I've got a way of making the simple more difficult . I just hope I can decide what I want in time for my March vacation to Florida (where a polarizer can come in very useful, I think)..

Thanks,Jon..

I agree with 'Wrightstuff' and would certainly advocate going down the Cokin route. However, I have the Sigma 10-20 and it vignettes quite badly with the P size filters (even when using one of the thinner wide angle filter holders) so I think I'm going to have to upgrade to the larger Z series - now they are expensive OUCH!.

Confused of Malvern.

'The greatest fool can ask more than the wisest man can answer'..

I agree, OUCH. I was seriously considering the Cokin Z-Pro series. I want a round circular polarizer so I can turn it separately from the holder. The only one I can find is the Cokin 164 at over $400!. Even the 4x4" circular polarizers when combined with the cost of the holder & adapters is hard to swallow..

I'm really just starting out. Maybe just a screw in 72mm polarizer to start with (at a much more modest $150 ) is the way to start. I'll worry about the rest later..

BTW, can the Z-Pro holder and a screw in filter be used at the same time? What would be the drawbacks?.

Thanks,Jon.

Confused of Malvern wrote:.

I agree with 'Wrightstuff' and would certainly advocate going downthe Cokin route. However, I have the Sigma 10-20 and it vignettesquite badly with the P size filters (even when using one of thethinner wide angle filter holders) so I think I'm going to have toupgrade to the larger Z series - now they are expensive OUCH!..

Boy, am I having a hard time making up my mind of what I want to purchase for filters, and filter systems. Now I'm thinking of getting the following: A screw on polarizer, and Cokin P filter holder. If I want to use the polarizer & another filter at the same time I can screw the Cokin adapter into the filter threads on the polarizer. At least that's the only way I can figure I can use both at the same time..

So, I have one more important question. If anyone out there has the Sigma 18-50mm f2.8 macro (72mm thread size), will this set up cause vignetting? I'm hoping someone else around here has tried this setup. If vignetting is not a problem I think it will be a fine combination..

Thanks,Jon..