Two reasons.

1. You haven't stated which version of the lens you are selling.

2. You have only just joined the forum, and nobody knows you.

Probably the version of the lens is obvious in the link, but you shouldn't expect people to go clicking on links when all you had to do was describe the lens properly in the first place.

It rather suggests that you don't know much about what you are selling, and that is not very encouraging to potential buyers.

G

Was that taken from the road coming down from the Horseshoe?

G

Stop bringing facts into the argument, Algi. Everybody knows that Pentax cameras focus slowly, and no amount of testing will convince people otherwise.

G

I suspect Bea Arthur would pay you quite a lot.

G

As it's manual focus, extension tubes would be a practical proposition.

G

Sigma 180mm

G

Well, I must admit I haven't looked recently, but at one time the Sigmas were not too difficult to get hold of.

I wonder why Sigma stopped making them.

G

I have bought almost all my lenses second-hand. There are long K-mount macro lenses available on the second-hand market, and I think it would be crazy to incur the massive costs of switching brands just because you can't find a new 200mm macro.

G

Focus is out on most of them.

Best setting for everyday use for most people in most circumstances is AV, and sensitivity of 200 ISO. Go to 400 or even 800 if light is poor.

(Almost) always keep shake reduction on, and remember to adjust aperture to reflect what you are photographing. Wide for the insect, small for landscapes. A small aperture keeps most things in focus, a wide one only what you focus on. But a small one requires a lower shutter speed to compensate for the reduced light reaching the lens.

Put all settings for colour, contrast, etc to neutral, until and unless you find you would prefer something different.

Novices to digital photography tend to over-sharpen and over-saturate their images. Less is more, generally.

Get and use a post-processing (image-editing) program of some sort, and use it to fine-tune your pictures. EVERY picture benefits from some adjustment.

Good luck.

G

I know people who eat out every night because they can't cook. Madness.

G