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02-01-2015, 05:32 PM   #1
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Kenko 3X Teleconverter for Minolta Mount question

Kenko 3X Teleconverter for Minolta Mount

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

K mount ?

02-01-2015, 05:37 PM   #2
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It is for Minolta?? Not k-mount.
02-01-2015, 05:42 PM   #3
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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
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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
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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, 07:51 PM   #6
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One last question: Where is the Ricoh pin on this teleconverter:
Attached Images
 
02-01-2015, 08:13 PM   #7
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QuoteOriginally posted by Michael Piziak Quote
What about manual focussing with them ?
The viewfinder will be dim - it will be a real challenge to get anything sharp

QuoteOriginally posted by Michael Piziak Quote
What is "auto" about these ?
Auto aperture.. as opposed to A/M M42 lenses
02-02-2015, 07:07 PM   #8
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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
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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
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QuoteOriginally posted by mattt Quote
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.
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