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07-01-2017, 02:17 PM   #1
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Comp. Sigma 100-300+1,4TC - Sigma 120-400 - Pentax 150-450


As a long Tele I am using a SIgma 100-300/4 on my K1 ...and if that is not long enough I use a sigma 1,4 TC.
What I really like on the 100-300 is the fast AF (mechanical) and quuality/weight of that combinations is quite good.

To my questiod: Has anyybody compared that to the lenses mentioned in the thread title?

07-01-2017, 02:25 PM   #2

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I'd like to know more about this, being a regular user of the 300 (later version) + 1.4TC on the K-3 and now the K-3 II - not that I could afford the 150-450.

OTOH, I have read not very good reports of the 120-400 - and, remember, both the 300 and the 120-400 are very old lenses.
07-01-2017, 02:40 PM   #3
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May be we should include the Da 60-250+DA-TC in thet comparison

btw:I enjoyed my combination possibility during the Isle of Man TT recently - only back side is that files do not tellyou whether you used the TC or not.

Last edited by klaus123; 07-01-2017 at 02:46 PM.
07-02-2017, 08:08 AM   #4
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I don't know anything about the 300, but I have the Sigma 120-400 and I recently bought the DA 60-250 and an HD DA 1.4x Teleconverter. The Sigma IQ isn't even in the ballpark with the DA combo. My Sigma now resides in the back of the closet.

07-02-2017, 08:23 AM   #5

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w.r.t. the Sigma long zooms, you might want to read the members' reviews here if you have not already done so.

A thing to also remember is the spares situation for those old Sigma zooms is poor to unobtainable (was lucky to get my 100-300 AF board replaced a couple of years ago, but I doubt it would be the same situation now).

Last edited by jeallen01; 07-02-2017 at 08:29 AM.
07-02-2017, 10:28 AM   #6
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FWIW .... I had the Sigma 100-300/4 and the Sigma 1.4x TC for a while (sold it): great performance. Better without the TC though.
I tried, twice, my daughter's Pentax D FA 150/450 on my K3, with and without the HD 1.4x TC ... great without the TC; satisfactory with the TC.
I would imagine that the 150-450 would rock on a K1 (lots of posts/threads about that combo on this site).
07-02-2017, 12:25 PM   #7

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I think you/"someone" edited out the comments about the aperture contact issues on the 100-300 & 1.4X TC (maybe "someone" thought you were swearing, but, of course, you were not!) - and I occasionally have the same problem because the TC introduces some rotational "play" in the mount, and so the contacts don't always line up correctly.

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