[IanS]

I'm heading of on a trip to to China shortly and want to know if there are any tip's, tricks or techniques that I can used to minimize the effect of smog.
I will be using a K200D, Sigma 17/70, Sigma 18/200. I have CPL, ND grad, Variable ND and uv filters for these lense's.

[hcc]

I shot in China and other places with fogg and smog. My experience is that some lenses are (much) better than others, and my favourite is the Voigtlander Nokton 58mm f1.4. It is the best lens (that I have) in poor lighting conditions, and it is outstanding IMHO.

I wrote a short subjective comparison between the FA31mm Ltd and VL58mm at :
https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/209251-fa31mm-...mm-f1-4-a.html

While I tend to prefer usually the IQ of the FA31mm overall, the VL58mm is extra-ordinary ( IMHO) in poor lighting conditions: e.g., fog, smoke, smog. In these conditions, I prefer the VL58mm over the FA31mm Ltd.

Hope that the comment may help.

[adwb]

Polariser filters can also help obviously depending on the direction of the sun to you and your subject.

[Na Horuk]

Tripod so you can have a long exposure, if the light is dim? The best you can do is to make the fog or smoke part of the composition, instead of "ignoring" it.

[IanS]

Thanks for the comments, will also try altering WB as I think the effect of bad smog will be similar to snow/cloud.

[wildman]

tricks or techniques that I can used to minimize the effect of smog.

Assuming minimally ok gear the most important thing would be a decent well exposed RAW file and skillful PP.

[IanS]

the most important thing would be a decent well exposed RAW file and skillful PP.

Well said