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Any thoughts on Sigma 150-500 vs Sigma 70-200+2x Sigma TC?
Posted By: maxxxx, 11-03-2014, 10:58 AM

I have a Sigma 70-200 HSM II and a Sigma 150-500 OS HSM. Both are quite good and complement each other quite well but I am getting tired of carrying two of these huge beasts (especially the 150-500). I am starting to wonder if adding the Sigma 2x TC to the 70-200 would be a lighter weight alternative. If I understand correctly this would result in a 140-200/5.6 lens.

Does anybody have experience with the TC? I don't want to lose too much focusing speed over the 15-500.
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11-03-2014, 11:51 AM   #2
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I havent been successful in finding a teleconverter for the Sigma 70-200HSM OS that effectively locks on focus consistently.
11-03-2014, 11:55 AM   #3
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I haven't had any luck with TC's on HSM lenses for auto focus.
If you don't mind manual focus it may be OK.
11-03-2014, 11:57 AM   #4
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I don't have the 70-200 but I do have a 100-300 f/4 that I shoot with a 1.4x TC and I find the IQ better than with the 150-500 at infinity. Within 30 yds/m the 150-500 is a very good lens even with the 1.4x TC. I'm thinking of trying the 100-300 with a 2x TC to see how the IQ is. Just my $0.02.

11-03-2014, 12:04 PM   #5
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QuoteOriginally posted by crewl1 Quote
I haven't had any luck with TC's on HSM lenses for auto focus.
If you don't mind manual focus it may be OK.
Even the sigma ones don't work?

---------- Post added 11-03-14 at 11:04 AM ----------

QuoteOriginally posted by wtlwdwgn Quote
I don't have the 70-200 but I do have a 100-300 f/4 that I shoot with a 1.4x TC and I find the IQ better than with the 150-500 at infinity. Within 30 yds/m the 150-500 is a very good lens even with the 1.4x TC. I'm thinking of trying the 100-300 with a 2x TC to see how the IQ is. Just my $0.02.
What TC are you using?
11-03-2014, 12:27 PM   #6
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QuoteOriginally posted by maxxxx Quote
Even the sigma ones don't work?
Sigma never made a HSM TC for Pentax.
11-03-2014, 12:50 PM   #7
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QuoteOriginally posted by boriscleto Quote
Sigma never made a HSM TC for Pentax.
I had no idea about that. Thanks for pointing it out.
11-03-2014, 02:50 PM   #8
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I use a 1.4x TC on the 100-300 with no loss in IQ. The Sigma TCs don't have HSM. Only the lenses do. All the TC does is communicate.

11-03-2014, 03:16 PM   #9
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QuoteOriginally posted by wtlwdwgn Quote
I use a 1.4x TC on the 100-300 with no loss in IQ. The Sigma TCs don't have HSM. Only the lenses do. All the TC does is communicate.
The 100-300 is screw drive? Sigma HSM does not communicate properly with Penrtax AF via any TC that I have tried.
11-03-2014, 11:59 PM   #10
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The Kenko or Tamron 1.5 PZ AF should work. I would stay away from 2x TC. You lose too much light and quality.
11-04-2014, 06:24 AM   #11
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QuoteOriginally posted by sergysergy Quote
The Kenko or Tamron 1.5 PZ AF should work. I would stay away from 2x TC. You lose too much light and quality.
I tested a Kenko 1.5 pz AF with Sigma HSM II.
It did not AF reliably.
IQ was good if focused manually.
The Kenko worked reliably with screw drive lenses.
11-04-2014, 07:41 AM   #12
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QuoteOriginally posted by sergysergy Quote
The Kenko or Tamron 1.5 PZ AF should work. I would stay away from 2x TC. You lose too much light and quality.
I have tried the Tamron. With the 150-500 it's not too bad. With the 70-200 it didn't focus at all
11-04-2014, 07:43 AM   #13
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So weird, I would expect just the opposite.
04-26-2015, 04:18 AM   #14
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I find the IQ of the old sigma 70-200 (screw drive) with 1.4x TC quite similar to the 100-300 which is a great lens, but is hard to find a good used one and it is expensive.

Last edited by edilioilre; 04-26-2015 at 04:31 AM.
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