[rrstuff]

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Sigma APO 350 1200mm F11 Teleconverter 1 4X for Pentax K | eBay

I think that's unusual. I don't think we have that many option in super-telephoto range. figured this might interest some prominent-sunset enthusiasts.

[kdf9511]

Wow. I don't know what I would do with that but it would be cool to have.

[rrstuff]

Wow. I don't know what I would do with that but it would be cool to have.

Well, you could covet it and make other Pentaxians jealous, for one .

When I googled a popular lens of this length (canon), I found there are three main uses.
1) Posing with it: http://m4.i.pbase.com/o5/33/205833/1/69722154.bl0vlVVp.Canon12005.jpg , http://www.dvinfo.net/canon/images/eos1200gg.jpg
2) Work out: http://sfcitizen.com/blog/wp-content/uploads/2010/11/juza_handholding_canon6...720px-copy.jpg
3) This kind of shots: http://f1.fsm.wikidi.com/af/aa/bf/b1fb970c0b45928ea468272a9fa7e0d439f8f1e4.jpg . I figure F11 shouldn't be a problem for sunsets, but it might be for birds...

[EarlVonTapia]

Someone needs to buy it and try it with a K-Q adapter.

Crop factor of 5.5 = 6600mm focal length!