[Dave]

OK, trying to kill 3 birds with one stone with the next lens.

Idea is to get the Sigma 150mm f/2.8 EX DG APO HSM Macro Lens. This will cover Macro work plus give me a 150mm telephoto. Now the thought is to use a 2x convertor to give me a 300mm also (albeit 2 stops slower)

Looking at prices I'm swayed towards Sigma 2x EX DG APO Teleconverter. But from what I can read I'm not sure if AF still works or not. I have statements of lens must be f/2.8 or less for AF to work with Sigma convertor, but not guarenteed

Any of you Sigma 150mm owners use a 2x convertor OK ?

[Steve]

Why not use the Kenko convertor, they are excellent quality and AF will still work

[Dave]

I assume you state that because saves another £25 , with same functionality ?

[Steve]

I state that because the quality of said item is known (well the 1.4x) and how it functions. If it saves you another £25 you can donate it to the Photography Forums fund, we graciously accept all donations

[Steve]

On Canon the AF works upto and including F5.6 unless you are using a Pro body were it will work at F8. Assuming Nikon to be the same then the Kenko will work with no issues.

[Dave]

Originally Posted by Steve

If it saves you another £25 you can donate it to the Photography Forums fund, we graciously accept all donations

. Cheers Steve.....I know the fund would prefer some example shots from new kit, which I will of course offer instead of that horrible stuff called money

[Steve]

Originally Posted by DJW

. Cheers Steve.....I know the fund would prefer some example shots from new kit, which I will of course offer instead of that horrible stuff called money

Hey, we will even accept donations of belly button fluff, Marcel loves the stuff. He has collected several tones of it now and made a rather comfy looking chair in the corner which we are not allowed near.

[Dave]

Excellent . Just found a good link for compatibility of teleconvertors here .

There is a cheap Nikon fit Kenko MC7 2x convertor on fleabay
From the 1st link it shows its MF only on HSM Sigma lenses, but AF on Nikon & Sigma AF lenses. Shame the Sigma I just bought & considering are both HSM .

[Joe T]

http://www.sigmaphoto.com/lenses/lenses_tele.asp
Any help?

[Dave]

Originally Posted by Joe T

http://www.sigmaphoto.com/lenses/lenses_tele.asp
Any help?

Cheers. Doesn't show 150mm lens though on list Not sure if that means it won't work with convertor ?

[Matt]

Dave, go for the pro series TC's from Kenco.
This item has higher quality glass, and performs as well as the manufacturers models.

[Dave]

Originally Posted by Matt

Dave, go for the pro series TC's from Kenco.
This item has higher quality glass, and performs as well as the manufacturers models.

Makes sense ....cheers

BTW, has anyone any shots from the Sigma 150mm used with a 2x convertor ? Just curious

Also does anyone have an opinion on any downsides of 150mm x2 = 300mm vs other options (other than light loss ?) .....just in case I've overlooked anything. I'm not worried about zoom capability, so can cope with crops or having to move to get the shot I want.

[Joe T]

Sigmas macro primes dont always focus very quickly, despite HSM.