1/4" Whitworth thread.

If you're feeling confused by contradictory answers, there's only one answer - have a go, try it and see what the result is.

DOF is purely a function of magnification, so if you decided that you wanted a picture of a coin to fill the frame is makes no difference if you use a 50mm or 100mm macro lens. One will be twice as far away, but the DOF is the same because the magnification is the same.

The perspective will change of course as you are now at a different distance, but that's something else.

I thought like you that Chris would transfer the 2 year warranty, so he's the man to ask to make sure that's still the deal.

Chris did post that he would transfer warrany, but at the time we were all discussing new lenses.

I would have a chat with him to see if indeed used lenses are not covered in that offer. The warranty in that case is coming from a different source, so maybe that makes a difference. Maybe not, but Chris is your man to discuss it with. Someone may have made a mistake as normally that would be right and warraties would not transfer.

You could try shooting in JPEG and using the Tungsten setting, or even AWB and then being content to let some of the warmth in.

In Photoshop, extreme redness can be reduced by using Photo Filter, probably the 80A, and aadjusting its intensity until it is more acceptable.

I wouldn't personally remove all the redness as that's a characteristic of the light and what the scene looks like.

We get so much bad press about security staff that I thought I'd mention the extremely heloful and courteous security man at the John Rylands Library in Manchester.

I was in there this morning, shooting a few pictures, and he approached me and asked if I'd like a tour of the upper galleries. So I was whisked upstairs for a personal tour of the best viewpoints, he offered advice and information and said come back any time.

He was also very impressed with how smooth, quick and quiet the Pentax DSLR was.

Not a very exciting tale maybe, but a nice change from stories of photographers and security staff hurling abuse at each other.

Sue and I will be there, but which day is unknown at the moment. It's something we always look forward to, but our feet don't...

A phone call to SRS should do the trick, or check out their website for Pentax Accessories.

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Good idea, you'll get optimum performance stopped down, providing camera shake is avoided.

A tripod is always best when evaluating lenses. The 2 second delay will rauise the mirror before exposure and switch off SR, thus removing any chance of vibration or over-compensation.