Photoshop Filters vs. Glass Filters on Your Camera:

Often digital photographers ask me, "Can you get the same effect from the application of a software-based graduated filter in Photoshop as you would using the glass (or resin) ND filter at the time of shooting?"

Same thing I've been saying for ages - take the very best photo you can, with the equipment you have with you. Don't rely on being able to 'fake it' in your darkroom (whether it's digital or film based) when you get home.

The better your source material, the better the end result will be.

On another note, I see that Jim's been down to my part of the world - if I'd known, I'd have tried to catch up!