Q: Step up rings & filters for very wide angle lenses

I'm planning on buying a filter (polarizer, at least for starters). I currently have lenses with 72 & 58mm filter threads. So far the plan is to get a step up ring and purchase a 72mm filter. I think it makes sense to purchase a good quality filter, so saving by using the same filter on both lenses makes sense to me..

The question relates to a lens I hope to buy. I'm interested in either a Sigma 10-20mm or (when it comes out) the new Tamron 10-24mm. Both have 77mm filter threads. So now I start thinking I should buy 2 step up rings and a 77mm polarizer..

Is this a good idea (or maybe I should ask if it's a bad idea)? First, I'm not sure what drawbacks there are using step up rings. I've already figured out that the lens hood can't be used with them. But are there other problems I haven't considered? And I'm not sure if I get a filter that won't cause vignetting at 10mm (with a 1.5 crop factor, so I think I should consider it a 15mm for this purpose). I'm really not sure if this makes a difference as far as the idea of using that filter (77mm) on the other two lenses. BTW, they are the Sigma 18-50mm f2.8, and Sigma 70-300 f4-5.6..

So, any experience with step up rings? And how about filters for very wide angle lenses?.


Comments (5)

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...

Comment #1

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)..


Comment #2

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'..

Comment #3

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?.


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!..

Comment #4

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..


Comment #5

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This question was taken from a support group/message board and re-posted here so others can learn from it.


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