Hmm, apologies for barging in, even though this was not addressed to me, my humble 2 cents.sfoxjohn said:I agree with the other poster who suggests that blending is better than using a filter. It isn't often that the break is a straight line.
I used to think that GND filters are obsolete and not needed anymore. This was until I read Galen Rowell's Mountain Light and Inner Game (and Thom Hogan's filter recommendation and Ken Rockwell's filter recommendation).
I bought a 2 stop soft GND filter and I am pretty much stunned. I used to muck with the two photo, blend digitally mode and never got anything as close to the GND filters yet. [Yes, I suck in photoshop, but then I have tried everything under the sun, better masking techniques, FM's DRI plugin, upgraded to PS CS2 and bracket 7 shots 1 stop apart and so on].
With my limited experience, I can say if one is careful with the way they use soft GND filters, the straight edge horzions don't matter. Shahed, Mahesh Thapa [http://www.starvingphotographer.com], Mike Soo [http://www.soocool.com], three landscape photographers I have grown to respect a lot continuously prove this to me via their photos.
Yes, you can avoid the use of GND filters if you are very good with photoshop and are willing to spend the time in front of the computer. But after spending hundreds of hours in front of the computer, I am a convert. I would rather buy those GND filters and try to spend the time during sunset
Sorry for the long rant.