Buying filters

[herc182]

I BOUGHT IT! THE D80....(I will post separately about this :D)

Got the 18-70mm lens (with a 67mm thread)
and sigma 10-20 (72mm thread)

I now would like to get ONE polariser that would fit the 72mm and get a step down ring (if it exists) to use it on the 67mm....does that exist?

Looking on ebay otherwise for seperate filters.

THanks

[coldrain]

You should be able to do that, although I would not want a bigger filter on my 18-70, because of 2 issues... Lens cap will not just fit on the lens anymore, so I would have to juggle with an extra big and the normal lens cap depending the situation, I would have to also screw the step down ring everytime when switching lenses and then also the filter... And I would not be able to use the sun hood when using the polarizer (and out of experience I know that sometimes in necessary).

Also, the Sigma has a 77mm filter size like the other ultra wide zooms, not 72mm.
Do yourself a favor and buy high quality polarized light filters, preferrably multi coated ones that offer some resistance to reflections (I bought a non-multicoated filter for my 12-24mm Tokina because of price and availability in my city (needed it right away), and a few photos show reflections that ruin the photo somewhat... the sun can easily catch the filter on a wide angle lens like your Sigma).

The multicoated polarizer I have for my EF 70-200 f4 L and 18-50mm f2.8 Sigma is a very good one from B&W, it is 67mm.
The cheap but good non-multicoated 77mm I have is made by Hoya I think, Hoya being another good brand to look at.

[herc182]

Thanks. Think I will get two polarisors then. From Ebay :D

Also want a frame that holds a 0.9ND filter for landscape shots....that will be off ebay too :D

Can you get girlfriends on ebay? :(

[Prospero]

I bought a regular (not-multicoated) 77mm Hoya circular polarizer for my D50 last week. It is not multi-coated and not slim. It doesn't matter that it is not slim, I find that there's no more vignetting wide open than usual as I have read in some articles on the internet and found after doing some quick tests.

However, as Coldrain pointed out, reflections/ghosting may become a problem. On one occassion I found that there was some ghosting in my picture. Using the lens hood solved the problem, but there may be occasions (when shooting towards the sun for instance) where the lens hood will not solve the problem. However, with careful use and knowing the limitations of the filter, ghosting problems can be avoided.

If you can afford/justify it I would get a multicoated polarizer for the Sigma, but if you can't (like me) I think the non-multicoated one will do just fine. Just beware of ghosting.

[T06]

I would rate them as very good so far with the use I've given them, only 220 pics or so. Haven't read bad things of them though.

[herc182]

is this filter ok for the 18-70mm lens
http://cgi.ebay.co.uk/67mm-HAMA-CIRCULAR-POLARISING-FILTER-NEW_W0QQitemZ190081415537QQihZ009QQcategoryZ30066Q QrdZ1QQcmdZViewItem

and this one for the sigma:

http://cgi.ebay.co.uk/Brand-New-Hoya-CIR-POLARIZING-Filter-77MM-CPL-UK-seller_W0QQitemZ230088427586QQihZ013QQcategoryZ300 66QQrdZ1QQcmdZViewItem

thanks

Need a bag, 50mm f1.8 and a memory card now...bloody hell....:(

[herc182]

anyone?

thanks....I know they are not multi coated :D

[coldrain]

Well I do not know what you want to hear now.... I said multicoated is quite important, but that I git the Hama 77mm single coated for above stated reasons, and that it is quite good unless the sun catches it from the side.

Since you are linking to a 77mm Hama... you have already been answered in that one. I'd really go for a multicoated one for the 18-70. From B&W, higher end Hoya, Canon or Nikon.

[herc182]

yeah you are right... will use the 18-70 most of the time....

I ask too many questions.... feel sorry for my parents :D

THanks for your help