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02-05-2018, 02:25 PM   #1
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Sigma teleconverters not compatible with Pentax cameras?

I have purchased two Sigma teleconverters: 1.4x APO and 2x APO EX. To my surprise, they fit onto cameras (K-1 and K-S2) very tightly - in fact I very slightly scratched housing of K-1 when trying to mount 2x! Albeit the scratch is minimal and can't be compared to ones caused by incompatible Sigma lenses, accordingly to my best knowledge there was not such a problem with Sigma TCs. Moreover, they fit very tightly even onto K-S2 - I put piece of very thin paper between housing of camera and housing of TC, only to find it difficult to remove. On K-1, I was unable to remove the paper, so basically there was no clearing at all. These TCs are not listed by Sigma as incompatible with K-1, and I wonder what is going on. Converters look and work well, and do not have marks of heavy use. Have you seen anything like this?

02-05-2018, 02:42 PM   #2
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I use both the Sigma 1.4x and 2x converters on my K-1 , with my Sigma 300mm/f2.8, and have not had any issues, works pefectly for me.

cmohr
02-05-2018, 03:55 PM   #3
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I commented on the 1.4x apo EX DG here:

Teleconverter challenge Sigma vs Kenko vs Tamron X1.4 - Page 3 - PentaxForums.com

Apart from the wee issue with the pin (post #40 in the linked thread) the tc fits fine on both lens and camera
02-05-2018, 04:49 PM   #4
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The 1.4x scratched by K-1. I asked Sigma about this and got this reply:

Thank you for contacting Sigma USA. There is no update needed.

02-06-2018, 10:47 AM   #5
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QuoteOriginally posted by 77me Quote
Thank you for contacting Sigma USA. There is no update needed.
Outstanding customer service. May I know how you solved the problem? I have not decided yet whether to keep TCs for APS-C only, sell them, or simply remove a little bit of plastic from TC housing.
02-06-2018, 04:51 PM   #6
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QuoteOriginally posted by pentageek Quote
Outstanding customer service. May I know how you solved the problem? I have not decided yet whether to keep TCs for APS-C only, sell them, or simply remove a little bit of plastic from TC housing.
I have not solved the problem but the scratch is very slight and I will continue to use it as is.

Last edited by 77me; 02-06-2018 at 05:55 PM.
02-07-2018, 03:42 PM   #7
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OK, thanks for info. I wrote to Sigma, let's see if they will be of help.
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