Kenko 3X Teleconverter for Minolta Mount question

Michael Piziak · 02-01-2015, 05:32 PM

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Kenko 3X Teleconverter for Minolta Mount

Question: Would this 3x converter work on a Pentax 55-300mm lens ?

K mount ?

**jatrax** · 02-01-2015, 05:37 PM

It is for Minolta?? Not k-mount.

Michael Piziak · 02-01-2015, 05:42 PM

I think the confusion is that this person has it listed as Pentax as the brand name when I searched for Pentax Lenses: Kenko 3X Teleconverter for Minolta Mount | eBay

---------- Post added 02-01-15 at 05:45 PM ----------

How about which one of this would work or be best

Vivitar MC Tele Converter 2X 22 for Pentax K Mount | eBay

or

JCPenney 2X Tele Converter for Pentax K Mount PK Mount Includes Case Mint | eBay

**mattt** · 02-01-2015, 06:23 PM

You're going to have a tough go auto focusing... the 2X teleconverter will rob 2 stops of light. At the long end your lens will now effectively be f11 - pretty dark for focusing.

Michael Piziak · 02-01-2015, 06:38 PM

What about manual focussing with them ?

---------- Post added 02-01-15 at 06:49 PM ----------

I may give one of these a try at these costs. I see Sears made one also which was made in Japan.
What is "auto" about these ?

---------- Post added 02-01-15 at 07:36 PM ----------

Also, I wonder how much this beast weighs: Sear 60 300mm F4 5 6 Zoom Lens 90 Day Warranty Excellent Plus Pentax K | eBay

Michael Piziak · 02-01-2015, 07:51 PM

One last question: Where is the Ricoh pin on this teleconverter:

**mattt** · 02-01-2015, 08:13 PM

Originally posted by Michael Piziak

What about manual focussing with them ?

The viewfinder will be dim - it will be a real challenge to get anything sharp

Originally posted by Michael Piziak

What is "auto" about these ?

Auto aperture.. as opposed to A/M M42 lenses

Michael Piziak · 02-02-2015, 07:07 PM

I have decided to scrap this idea as far as 2x teleconverters goes - no use to try it if it will be too dim to shoot with.

I wander if like a 1.4x teleconverter would have enough light to shoot?

**mattt** · 02-03-2015, 08:22 AM

1.4x tele is a 1 stop loss of light

Most DSLR's will focus an f8 lens - you will find the 1.4 AF TC is highly sought after.

Michael Piziak · 02-03-2015, 10:47 AM

Originally posted by mattt

1.4x tele is a 1 stop loss of light

Most DSLR's will focus an f8 lens - you will find the 1.4 AF TC is highly sought after.

I see what you mean. The 1.4x teleconverters are much more expensive.

02-01-2015, 05:32 PM	#1
Michael Piziak Closed Account Join Date: Dec 2013 Location: West Virginia Posts: 2,815	Kenko 3X Teleconverter for Minolta Mount question Staff note: This post may contain affiliate links, which means Pentax Forums may earn a small commission if a visitor clicks through and makes a purchase. If you would like to support the forum directly, you may also make a donation here. Kenko 3X Teleconverter for Minolta Mount Question: Would this 3x converter work on a Pentax 55-300mm lens ? K mount ?

02-01-2015, 07:51 PM	#6
Michael Piziak Closed Account Join Date: Dec 2013 Location: West Virginia Posts: 2,815 Original Poster	One last question: Where is the Ricoh pin on this teleconverter: Attached Images

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02-01-2015, 05:37 PM	#2
jatrax Site Supporter Join Date: May 2010 Location: Washington Cascades Photos: Gallery \| Albums Posts: 12,991	It is for Minolta?? Not k-mount.

02-01-2015, 05:42 PM	#3
Michael Piziak Closed Account Join Date: Dec 2013 Location: West Virginia Posts: 2,815 Original Poster	I think the confusion is that this person has it listed as Pentax as the brand name when I searched for Pentax Lenses: Kenko 3X Teleconverter for Minolta Mount \| eBay ---------- Post added 02-01-15 at 05:45 PM ---------- How about which one of this would work or be best Vivitar MC Tele Converter 2X 22 for Pentax K Mount \| eBay or JCPenney 2X Tele Converter for Pentax K Mount PK Mount Includes Case Mint \| eBay

02-01-2015, 06:23 PM	#4
mattt Site Supporter Join Date: Feb 2011 Location: Niagara Photos: Gallery \| Albums Posts: 3,907	You're going to have a tough go auto focusing... the 2X teleconverter will rob 2 stops of light. At the long end your lens will now effectively be f11 - pretty dark for focusing.

02-01-2015, 06:38 PM	#5
Michael Piziak Closed Account Join Date: Dec 2013 Location: West Virginia Posts: 2,815 Original Poster	What about manual focussing with them ? ---------- Post added 02-01-15 at 06:49 PM ---------- I may give one of these a try at these costs. I see Sears made one also which was made in Japan. What is "auto" about these ? ---------- Post added 02-01-15 at 07:36 PM ---------- Also, I wonder how much this beast weighs: Sear 60 300mm F4 5 6 Zoom Lens 90 Day Warranty Excellent Plus Pentax K \| eBay

02-01-2015, 08:13 PM	#7
mattt Site Supporter Join Date: Feb 2011 Location: Niagara Photos: Gallery \| Albums Posts: 3,907	Originally posted by Michael Piziak What about manual focussing with them ? The viewfinder will be dim - it will be a real challenge to get anything sharp Originally posted by Michael Piziak What is "auto" about these ? Auto aperture.. as opposed to A/M M42 lenses

02-02-2015, 07:07 PM	#8
Michael Piziak Closed Account Join Date: Dec 2013 Location: West Virginia Posts: 2,815 Original Poster	I have decided to scrap this idea as far as 2x teleconverters goes - no use to try it if it will be too dim to shoot with. I wander if like a 1.4x teleconverter would have enough light to shoot?

02-03-2015, 08:22 AM	#9
mattt Site Supporter Join Date: Feb 2011 Location: Niagara Photos: Gallery \| Albums Posts: 3,907	1.4x tele is a 1 stop loss of light Most DSLR's will focus an f8 lens - you will find the 1.4 AF TC is highly sought after.

02-03-2015, 10:47 AM	#10
Michael Piziak Closed Account Join Date: Dec 2013 Location: West Virginia Posts: 2,815 Original Poster	Originally posted by mattt 1.4x tele is a 1 stop loss of light Most DSLR's will focus an f8 lens - you will find the 1.4 AF TC is highly sought after. I see what you mean. The 1.4x teleconverters are much more expensive.