Maybe but the Bower has the PZ contacts and Vivitar don't so they are at least different.

Sadly it doesn't have the powerzoom/SDM contacts

There is also a 7 elements one.

Bower also have 2 2x tc 4 and 7 elements but they do have the PZ contacts.
Anyone know if they work?

Lower the flash output off the lens.

The capacitor has a charge to deliver one flash at 1/1 power so at 1/2 power you can get 2 flashes after each other, ect.

If you shoot with p-ttl then use a wider aperture or higher ISO.

Had some contact with someone of the place (Bibelot) where the concert are, she was quite helpful and i made some requests for some other concerts so who knows

Welcome to the forum.

To be honest it isn't advisable to use a 2x TC unless with a very good lens and those or often prime lenses (fixed focal length/no zoom).
So you come back at the very expensive Pentax 1.7x TC or some 1.4x TC Kenko and tamron still made those i believe.

For the DA 50-200 i wouldn't advise to use a TC at all, better to spend a bit more money and get a Pentax DA or DAL 55-300

I've the Velbon Sherpa Pro CF or something like that, it's the Velbon carbon fibre monopod now at least you know what i'm talking about
That one also have twist locks and i must say that they have never failed me, they are quick and easy to operate.

Gitzo also use twist locks, at least for their tripods and they seems to preform pretty well.

In no particular order
Anybody can vote. Entrants are encouraged not to vote for their own. (not that we'd know)
Select and vote on your favourite for whatever reasons you see fit.
"Leaves"

Voting closes end of 27th October, PUF standard time.

#1
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#2
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#3
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#4
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#6
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#7
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#8
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forgot that the comp ended today, sorry
Will quickly make the voting thread.

I saw your link but funny enough it displays a tripod as the second image, probably a fault on the website.

Indeed it's a fish
here is the redsnapper monopod http://www.redsnapperuk.com/camera-accessories/RSM_284_Monopod.html