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Fritzenpapa · 10-04-2013, 02:11 AM

Hi,
I am looking for a 2x Converter to turn my Pentax 67 ED IF 300mm lens into a 600mm lens. Of course, I don´t 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!

**gofour3** · 10-04-2013, 08:48 AM

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.

Fritzenpapa · 10-05-2013, 05:20 AM

Thank you, Phil. Anybody else who knows these converters?

rob1234 · 10-05-2013, 07:46 AM

Might be worth a read:

P-Ext

Pentax 67 Long Lens Comparison

Fritzenpapa · 10-05-2013, 01:44 PM

A great test, answering all of my questions! Thank you.

desertscape · 10-05-2013, 10:43 PM

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.

LFLee · 10-08-2013, 01:01 PM

Originally posted by Fritzenpapa

Hi,
I am looking for a 2x Converter to turn my Pentax 67 ED IF 300mm lens into a 600mm lens. Of course, I don´t 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.

bull drinkwater · 11-15-2013, 02:54 PM

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.

10-04-2013, 02:11 AM	#1
Fritzenpapa Forum Member Join Date: Feb 2013 Location: Schwarzwald Photos: Albums Posts: 73	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 don´t 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!

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10-04-2013, 08:48 AM	#2
gofour3 Site Supporter Join Date: Oct 2008 Location: Vancouver, Canada Posts: 8,093	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
Fritzenpapa Forum Member Join Date: Feb 2013 Location: Schwarzwald Photos: Albums Posts: 73 Original Poster	Thank you, Phil. Anybody else who knows these converters?

10-05-2013, 07:46 AM	#4
rob1234 Veteran Member Join Date: Apr 2010 Location: Wiltshire/Hampshire Photos: Albums Posts: 1,760	Might be worth a read: P-Ext Pentax 67 Long Lens Comparison

10-05-2013, 01:44 PM	#5
Fritzenpapa Forum Member Join Date: Feb 2013 Location: Schwarzwald Photos: Albums Posts: 73 Original Poster	A great test, answering all of my questions! Thank you.

10-05-2013, 10:43 PM	#6
desertscape Pentaxian Join Date: Feb 2009 Location: Arizona Posts: 1,272	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
LFLee Veteran Member Join Date: Aug 2009 Location: Southern California Photos: Gallery \| Albums Posts: 2,292	Originally posted by Fritzenpapa Hi, I am looking for a 2x Converter to turn my Pentax 67 ED IF 300mm lens into a 600mm lens. Of course, I don´t 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
bull drinkwater Loyal Site Supporter Join Date: Nov 2011 Location: pontiac mi. Posts: 392	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.

2x Converter for Pentax 6x7

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