teleconverters

ACHEBONE · 10-03-2010, 10:56 AM

Good day, I have a Pentax DA* 300mm f/4 that i use on my k20, what teleconverter would you suggest? Thanks Rob

Chuck-B&H · 10-03-2010, 11:08 AM

Hello,

These will fit but will not support Auto Focusing.

teleconverter pentax

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ACHEBONE · 10-03-2010, 11:14 AM

Thanks , i am more interested in maintaining quality than the autofocus option ......Cheers Rob

dgaies · 10-04-2010, 06:24 AM

Originally posted by ACHEBONE

Thanks , i am more interested in maintaining quality than the autofocus option ......Cheers Rob

The Tamron 1.4x Pz-AF teleconverter will give you AF on the DA*300 (SDM). I've used the combo in the past and got pretty decent results with it. It is no longer produced, so you'd have to find a used copy. Here's a link you might want to check out.

brownargus · 10-04-2010, 07:09 AM

tom1803, who posted on this forum, had a supply of Kenko 1.5 converters Pz-AF 1.5 teleplus SHQ, sourced in Japan, which have the extra contacts to permit SDM focusing. The price was around £100. I purchased one and it certainly works with my 300 DA* lens. It appears to have comparable quality to the normal Kenko 1.5 converter. Focus with the 300 is a little slow and hunts especially if the light levels are low. Also, the depth of field is pretty small! Don't know whether there are any left!

John

audiobomber · 10-04-2010, 07:12 AM

https://www.pentaxforums.com/forums/photographic-equipment-sale/116532-sale-k...worldwide.html

One left.

Rime · 10-05-2010, 04:38 PM

It looks like Pentax has just fired up the Vietnamese production line for the 1.7 teleconverter. Mine came yesterday ! I had to order it from a Japanese camera equipment store, or I'd have all kinds of duck pictures ( migration season in the California Bay Area ) to show you what can be done. I got mine through Japan Exposures. If you go that route, contact them first to make sure they can get more. Mine was in the 2nd batch that Japan Exposures got.

**dadipentak** · 10-05-2010, 05:50 PM

I've found that the Pentax AF 1.7x & 2x-S TCs match up very well with the DA*300mm. I've been quite pleased with the results.

audiobomber · 10-06-2010, 04:49 AM

How does AF work with the Pentax 1.7? Do you manually focus first, to get within the TC' range?

---------- Post added 2010-10-06 at 07:51 ----------

How does AF work with the Pentax 1.7? Do you manually focus first, to get within the TC's AF range?

**dadipentak** · 10-06-2010, 05:51 AM

Originally posted by audiobomber

How does AF work with the Pentax 1.7? Do you manually focus first, to get within the TC' range?

---------- Post added 2010-10-06 at 07:51 ----------

How does AF work with the Pentax 1.7? Do you manually focus first, to get within the TC's AF range?

Yes, exactly.

**Schraubstock** · 10-30-2010, 05:46 AM

Originally posted by ACHEBONE

Good day, I have a Pentax DA* 300mm f/4 that i use on my k20, what teleconverter would you suggest? Thanks Rob

I use the SMC Pentax -F 1.7X AF adapter on my SMC 60-250* with absolutely stunning results, and I mean stunning. Bought it on one of my frequent visits to Tokyo for some $250 US. But they are hard to find even in Japan. I had to specially order mine. AF is fast an accurate on my K7 but you need to get into a near enough focus range before the adapter takes over. No problem with the 60-250 it has a clutched manual focus ring.

10-03-2010, 10:56 AM	#1
ACHEBONE Forum Member Join Date: Jan 2010 Location: Ladner B.C. CaNADA Photos: Gallery \| Albums Posts: 58	teleconverters Good day, I have a Pentax DA* 300mm f/4 that i use on my k20, what teleconverter would you suggest? Thanks Rob

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10-03-2010, 11:08 AM	#2
Chuck-B&H B&H Photo Specialist Join Date: May 2010 Location: New York Posts: 935	Hello, These will fit but will not support Auto Focusing. teleconverter pentax C h u c k C a p r i o l a Live Chat and E-Mail Sales Manager B&H Photo-Video Thank you, we appreciate your business. * Peace on Earth *

10-03-2010, 11:14 AM	#3
ACHEBONE Forum Member Join Date: Jan 2010 Location: Ladner B.C. CaNADA Photos: Gallery \| Albums Posts: 58 Original Poster	Thanks , i am more interested in maintaining quality than the autofocus option ......Cheers Rob

10-04-2010, 06:24 AM	#4
dgaies Veteran Member Join Date: Oct 2009 Location: Maryland / Washington DC Posts: 3,917	Originally posted by ACHEBONE Thanks , i am more interested in maintaining quality than the autofocus option ......Cheers Rob The Tamron 1.4x Pz-AF teleconverter will give you AF on the DA*300 (SDM). I've used the combo in the past and got pretty decent results with it. It is no longer produced, so you'd have to find a used copy. Here's a link you might want to check out.

10-04-2010, 07:09 AM	#5
brownargus Forum Member Join Date: Sep 2008 Location: Rotherham, South Yorkshire, UK Posts: 55	tom1803, who posted on this forum, had a supply of Kenko 1.5 converters Pz-AF 1.5 teleplus SHQ, sourced in Japan, which have the extra contacts to permit SDM focusing. The price was around £100. I purchased one and it certainly works with my 300 DA* lens. It appears to have comparable quality to the normal Kenko 1.5 converter. Focus with the 300 is a little slow and hunts especially if the light levels are low. Also, the depth of field is pretty small! Don't know whether there are any left! John

10-04-2010, 07:12 AM	#6
audiobomber Veteran Member Join Date: May 2008 Location: Sudbury, Ontario Photos: Albums Posts: 6,806	https://www.pentaxforums.com/forums/photographic-equipment-sale/116532-sale-k...worldwide.html One left.

10-05-2010, 04:38 PM	#7
Rime New Member Join Date: Apr 2010 Location: San Francisco Bay Area Posts: 7	It looks like Pentax has just fired up the Vietnamese production line for the 1.7 teleconverter. Mine came yesterday ! I had to order it from a Japanese camera equipment store, or I'd have all kinds of duck pictures ( migration season in the California Bay Area ) to show you what can be done. I got mine through Japan Exposures. If you go that route, contact them first to make sure they can get more. Mine was in the 2nd batch that Japan Exposures got.

10-05-2010, 05:50 PM	#8
dadipentak Site Supporter Join Date: Jul 2008 Location: Baltimore, Maryland Photos: Gallery Posts: 11,590	I've found that the Pentax AF 1.7x & 2x-S TCs match up very well with the DA*300mm. I've been quite pleased with the results.

10-06-2010, 04:49 AM	#9
audiobomber Veteran Member Join Date: May 2008 Location: Sudbury, Ontario Photos: Albums Posts: 6,806	How does AF work with the Pentax 1.7? Do you manually focus first, to get within the TC' range? ---------- Post added 2010-10-06 at 07:51 ---------- How does AF work with the Pentax 1.7? Do you manually focus first, to get within the TC's AF range?

10-06-2010, 05:51 AM	#10
dadipentak Site Supporter Join Date: Jul 2008 Location: Baltimore, Maryland Photos: Gallery Posts: 11,590	Originally posted by audiobomber How does AF work with the Pentax 1.7? Do you manually focus first, to get within the TC' range? ---------- Post added 2010-10-06 at 07:51 ---------- How does AF work with the Pentax 1.7? Do you manually focus first, to get within the TC's AF range? Yes, exactly.

10-30-2010, 05:46 AM	#11
Schraubstock Site Supporter Join Date: Oct 2010 Location: Melbourne Photos: Gallery Posts: 3,386	Originally posted by ACHEBONE Good day, I have a Pentax DA* 300mm f/4 that i use on my k20, what teleconverter would you suggest? Thanks Rob I use the SMC Pentax -F 1.7X AF adapter on my SMC 60-250* with absolutely stunning results, and I mean stunning. Bought it on one of my frequent visits to Tokyo for some $250 US. But they are hard to find even in Japan. I had to specially order mine. AF is fast an accurate on my K7 but you need to get into a near enough focus range before the adapter takes over. No problem with the 60-250 it has a clutched manual focus ring.