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10-04-2013, 02:11 AM   #1
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2x Converter for Pentax 6x7

Hi,
I am looking for a 2x Converter to turn my Pentax 67 ED IF 300mm lens into a 600mm lens. Of course, I donīt want to loose the great performance of this lens. My question to all of you having used 2x Converters for the Pentax 67 system: Is there a reasonable difference between the older, black coloured converters and the "new" grey ones? What about "third-party"-converters from Kenko? Thank you!

10-04-2013, 08:48 AM   #2
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I only have the newer grey 2X converter, which I haven’t got around to using yet.

According to the Pentax manuals the older black T6-2 X has 6 elements in 6 groups. The newer grey 2x has 6 elements in 4 groups.

As you have the latest 67 300mm I would go with the newer grey 2X converter.

Other forum members who have more experience with the 6x7 telephotos will have more information for you.

Phil.
10-05-2013, 05:20 AM   #3
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Thank you, Phil. Anybody else who knows these converters?
10-05-2013, 07:46 AM   #4
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Might be worth a read:

P-Ext

Pentax 67 Long Lens Comparison

10-05-2013, 01:44 PM   #5
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A great test, answering all of my questions! Thank you.
10-05-2013, 10:43 PM   #6
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If you are using the 300 ED + 2x converter on a P67, there is a serious problem with shutter vib even though the 300 has a tripod mount. This is especially true at 1/4 to 1/30 sec.
10-08-2013, 01:01 PM   #7
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QuoteOriginally posted by Fritzenpapa Quote
Hi,
I am looking for a 2x Converter to turn my Pentax 67 ED IF 300mm lens into a 600mm lens. Of course, I donīt want to loose the great performance of this lens. My question to all of you having used 2x Converters for the Pentax 67 system: Is there a reasonable difference between the older, black coloured converters and the "new" grey ones? What about "third-party"-converters from Kenko? Thank you!
I have one that come with the whole set I bought... too bad you are not close by else would gladly let it try it.
11-15-2013, 02:54 PM   #8
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i am using the 67 300mm on a 645d camera, with an adapter and a 2x 645 teleconverter. the results have been verry good. i also use a lens support.

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