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02-24-2016, 06:11 PM   #1
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1.4x teleconverter question

Hello Pentaxians!

I have read the reviews on the Pentax HD 1.4x TC and they are very good, the average rating is 9.19.

However, I always learn more and understand better when I hear directly from all of you out there with way more photography experience and knowledge than me.

I am having a hard time understanding the value of the added 1.4x reach when there is a loss of "light collection" (f stop?)...

Most of my photography has been my kids sports - using my K3 and 70-200 f2.8 tamron...I wonder if the extra reach (which would be great for HS soccer and field hockey games on large fields) would be offset by my loss of light sensitivity (not sure if that is the right terminology).

Here are some specific questions:

Would it make sense to use the 1.4x ONLY during day games and when the sun is bright?
Would the TC not be a good idea for indoor soccer, gymnastics, etc?
Is using the TC and reaching to 280 at F4 better than reaching to 200 at f2.8 and then needing to crop more (as I currently do for long shots)?

So many questions, so little time

Thanks for your expertise and as always excellent advice!!!


02-24-2016, 06:29 PM - 1 Like   #2
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The 1.4 should be great for day games. At night, you'll want the ƒ2.8. But, before I made that decision I'd check some night game images to see if you need ƒ2.8. No one but you knows how good the lights are for your soccer pitch.
02-24-2016, 06:41 PM - 1 Like   #3
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As long as there is decent lighting you really wont see a loss of IQ with the 1.4tc and the Tamron 17-200 f/2.8.
02-24-2016, 07:07 PM - 1 Like   #4

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I own half a dozen TCs,but not the 1.4x Pentax which would be very good.It is a WR which justifys the price IF you need it.Its a waste on the Tamron.My advice is read the third party reviews of the 1.4 AF TCs,they can be found for 20% of the Pentax price.I own 3 actual Tamron TCs...2 are good,the other is ordinary.My AF 1.4 is great(vivitar)but comes under other names too.Flip the page to 2
3rd Party it may save you some cash.

02-24-2016, 08:01 PM - 1 Like   #5
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The advantage of the TC for Soccer is the extra reach because l like to take the pictures from behind the goal my team is attacking. With the extra reach I can crop less.
And if the TC can maintain the IQ even better.
Definitely OK to use in bright day light.
you can try indoor and share your pictures please.

I do not have the Tamron but in the link below you can see that the Pentax 1.4 TC did OK maintaining IQ on my DA*300 and from long distance (420mm). The last picture on my set is with the DA*60-250 zoom + 1.4TC and I can tell that it is not as good as the 60-250 without TC.

You have a 2.8 lens and my Da300 and da60-250 are F4; therefore you will have more light than in my case.

My recommendation to you is to rent the pentax 1.4 TC from or similar and try it out in you Tamron outdoor and indoor and share the pictures with us. Share the results.
02-24-2016, 08:04 PM - 1 Like   #6
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QuoteOriginally posted by radman Quote
Hello Pentaxians!

I am having a hard time understanding the value of the added 1.4x reach when there is a loss of "light collection" (f stop?)...

Well converting a 300mm to a 420mm is worth it. Especially on a cropped sensor body, then it effectively becomes a 630mm lens relative to Full frame.
02-24-2016, 08:22 PM - 1 Like   #7

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1.4 TCs generally are considered one stop slower than the lens,2x two stops.

No problem on bright sunny days, or well lit night games

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