Anyone used 2x TC with Sigma 100-300 APO EX DX ?


SteveT

Link Posted 12/02/2012 - 15:45
Ive been using this lens happily with a sigma 1.4 x for some time.
Ive been wondering about getting a 1.7 or 2 x TC.
I know I will lose some more light but how much IQ will I lose?

I also note that the Sigma TC is significamtly dearer than the Kenko, any opinions either way on this?
K20d
DA 12-24 | DA* 16-50 | DA* 50-135 | Sigma 100-300 F4
Lightroom 2, CS3
My FlickR

matwhittington

Link Posted 12/02/2012 - 15:55
I have the sigma 100-300 and have just recently got hold of a sigma 2x TC second hand as a bit of a bargain. Not got many examples with it so far as have not had the TC long but with decent light/contrast the whole arrangement autofocuses OK, and I think it is capable of delivering sharp results although I suspect a bit more hit and miss than at 300mm, and with some loss of IQ for sure I think.

Maybe not the best subject but here is a pic with the 100-300 + 2x TC from a couple of weeks ago...




It is certainly worth looking around for a second hand TC - they do appear from time to time on the websites of SRS, Ffordes etc. I got mine from LCE in London.

Cheers
Mat W

My Flickr: link

Mike-P

Link Posted 12/02/2012 - 16:28
100-300mm f4 and Sigma 2x. All handheld.

Looking at these again I do wonder why I sold mine.



Moon 02/12/09 900mm (600mm 1.5x crop) Hand Held. by Mike.Pursey, on Flickr



Fallow Deer in the New Forest by Mike.Pursey, on Flickr



Fallow Deer in the New Forest by Mike.Pursey, on Flickr



Sparrow on feeder - testing 100-300mm sigma with 2x TC by Mike.Pursey, on Flickr
. My Flickr
Last Edited by Mike-P on 12/02/2012 - 16:29

prsjnb

Link Posted 12/02/2012 - 18:02
I have found recently that the Sigma 100-300mm f/4 is still capable of respectable results when used with a Tamron 2X Pz-AF BBAR MC7 (no longer available 'new', but not that uncommon on ebay), which I understand to be the same design and manufacture as the Kenko converter. Below is a substantial crop of a recent exploratory shot taken with the lens 'wide open':

Sigma 100-300 f/4.0 EX DG plus Tamron 2X Pz-AF BBAR MC7 by Dr 'B ', on Flickr">[img]http://farm8.staticflickr.com/7006/6629090803_ee2827635a_b.jpg" class="comment_image" />

Sigma 100-300 f/4.0 EX DG plus Tamron 2X Pz-AF BBAR MC7 by Dr 'B ', on Flickr" class="comment_image" />


Jon

SteveT

Link Posted 12/02/2012 - 18:26
Thanks

It may be worth a look then. As I get more into wildlife I may have to move to another manufacturers body for a really long lens but this may keep me going in the meantime if I can get one for the right price.
K20d
DA 12-24 | DA* 16-50 | DA* 50-135 | Sigma 100-300 F4
Lightroom 2, CS3
My FlickR

jeallen01

Link Posted 13/02/2012 - 21:00
Have used my 100-300mm F4.0 with both the Sigma 1.4x & 2.0x converters on my K-5 - biggest difference is the autofocusing speed, which is significantly slower with the 2.0x than with the 1.4x, and "hunting" was more pronounced.

That proved a problem at airshows, but probably not for slower moving objects at a reasonably constant distance (like Mike P's wildlife shots)!

Therefore tended to use the 1.4x most of the time (as I also found with the 70-200mm F2.8 Sigma).
K-3 II, K-3 and a K-70 from SRS (having now relegated the K-30 /"K-50" to a backup body), & some Sigma and Pentax lenses (and a lot of old 35mm gear!)
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