QUOTE(LegendLee @ Nov 14 2014, 11:36 PM)
It's just some fancy numbers.
Yes, it's based on stops.
A 3 stop filter is relatively cheaper and will not degrade your quality as much as a 8 stop filter.
CPL doesn't do much. One of my most underused equipment. I would rather save the amount for a proper ND filter.
- Reflections, it removes some at some angles. I find avoiding reflections in the first place to be a lot more practical. Besides reflections can benice.
- Removes polarized light (TV screens), eh, when would I need to do this ?
- Deeper blue skies. Photoshop does this easily. I bought color efex pro 4 anyway. Might as well use it.
ND is useful. But like I said, cheap ones will give you color cast.
If you can live with it, sure. If not, you may find yourself spending more in the long run.
Also, at least a 77mm or a 82mm filter thread.
Then get step down adapters.
Looks like I need to try out the CPL filter to see if I really need it.
For ND, is it worth to go for more stops and sacrifice image quality? In my opinion if you go for brighter ones, you need to stop down more to achieve the desired exposure which may cause diffraction sometimes; while if you go for darker ones, you stop down less but the filter might degrades more.
About the filter size, a 77mm is very expensive for me, since I will be mostly using on my m4/3 system (largest diameter I have currently is 62mm). I might get a 10-18 or other UWA for my M in future since m4/3 UWA is really expensive compared to APSC ones. I know 77mm is very versatile for adapting on various lenses but the price is quite high