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04-26-2015, 04:19 PM   #1

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K5IIs, Pentax 1.4 Rear Converter, Sigma 150-500 Experiences


I was just curious as to if any of you out there have any hands on experience using the K5IIS, Pentax 1.4 Rear Converter, and Sigma 150-500 DG OS for Pentax combination. What I am curious about is if the AF works satisfactorily, if the images retain their IQ (sharpness, color, etc.) and how you would rate the worthiness of the performance. If any of you have the similar combination, but use the Sigma 50-500 DG OS for Pentax instead of the 150-500 and would like to express your opinion on performance, I would also be interested in what your experience has been in case I purchase the 50-500 for range. I was sort of looking forward to Sigma making the 150-600 sport version lens available in a Pentax mount, but that has not seemed to happen. My 150-500 does an excellent job on its own, and I am interested in seeing if the Pentax 1.4 rear converter would allow me to retain IQ. I know I would lose an F-Stop of performance, but if the lens would perform well with the Pentax converter, than that I may see that as a possibility in extending my range to 700 for those extreme distance situations.

I had submitted a similar thread to this at an earlier time, but this is more directed toward actual hands on experience with the combination(s) I have mentioned.

Thanks ahead for any info pertaining to my question/subject.

I hope you all are having a nice weekend.


Last edited by C_Jones; 04-26-2015 at 04:23 PM. Reason: Edit
04-27-2015, 10:36 AM   #2
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I can't say, but I tested my 150-500 with the Kenko teleplus 1.7x on my K5, but it hunted a lot and the IQ was not very good...
04-27-2015, 01:39 PM   #3
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You might be better off posting this query on the dedicated Pentax SLR Lens Discussion Forum.
04-28-2015, 08:22 AM   #4

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I am going to post a new thread in the Pentax SLR Lens Discussion Forum area per this subject. Although I am mentioning a K5 series (K5IIs) camera in this forum, I suppose the actual lens information may be more applicable in the Lens forum.

Thank you.

04-28-2015, 08:27 AM   #5
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I tested the Pentax HD 1.4x with the Sigma 50-500 OS and it did not AF reliably.
This has been the case for any converter I tested with Sigma HSM lenses.
They work great if your Sigma lens is screw driven.
04-28-2015, 02:49 PM   #6

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Thanks crewl1.

Last edited by C_Jones; 04-28-2015 at 02:50 PM. Reason: Edit

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camera, converter, dslr, experience, iq, k-5, k-5 ii, k-5 iis, k5, k5iis, lens, pentax, pentax 1.4 tc, pentax k-5, sigma, sigma 150-500 dg os
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