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05-21-2020, 03:54 PM   #1
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Pentax 1.4x converter

I was wondering how the DA* 50-135 performs with the Pentax 1.4x converter? I'm planning on getting the DA* 300mm and the 1.4x converter and i'm curious how that works with the DA* 50-135.

05-21-2020, 04:08 PM   #2
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have you read the in depth review yet ?

QuoteQuote:
Lens Compatibility
Lenses must be F4 or faster for full autofocus compatibility. Slower lenses (F5.6, F5.8) can be used, but phase detect autofocus could be unreliable in which case contrast detect autofocus (live view) is recommended.

Curiously, according to Pentax the SMC Pentax-DA 17-70mm F4 lens may not properly acquire focus in contrast detect mode (live view), here phase detect (viewfinder) should be used when the teleconverter is mounted.

The following lenses are not supported according to Pentax; using these lenses with the converter will damage the lens or converter:
SMC Pentax-DA 15mm F4 ED AL Limited
HD Pentax-DA 15mm F4 ED AL Limited
SMC Pentax-DA 21mm F3.2 AL Limited
HD Pentax-DA 21mm F3.2 AL Limited
SMC Pentax-DA 40mm F2.8 XS

All other current lenses (as of March 2014) can be used with these caveats:
SMC Pentax-DA* 55mm F1.4: The largest usable aperture with converter is F2.4 (the same holds for the F and FA 50mm F1.4 lenses as per our tests)
SMC Pentax-DA 17-70mm F4: Contrast detect AF is unreliable, use phase detect
HD Pentax-DA 560mm F5.6: phase detect autofocus may be unreliable, use contrast detect
SMC and HD Pentax-DA 55-300mm F4-5.8: phase detect autofocus may be unreliable when zoomed in, use contrast detect
Read more at: Pentax-DA 1.4x AW AF Rear Converter Review - Specifications | PentaxForums.com Reviews
05-21-2020, 06:14 PM   #3
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I have. I was hoping to get some opinions from people who have used the combo together. Questions like how is the focus speed and accuracy.
05-21-2020, 07:16 PM   #4
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Don't know but with the DA 300mm it awesome.

05-21-2020, 07:35 PM - 1 Like   #5
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I've used it with the DA*60-250 and the DA*300 and was very happy with the results. Sorry no experience with the 50-135. However I can say that though expensive the HD 1.4x provides superb quality unlike many of the cheap third party ones I tried over the years. Several people I respect have done actual tests showing that there is no degradation of the image by the TC.
05-21-2020, 08:01 PM   #6
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I kept watching ebay and got a used one for $220.00
05-22-2020, 01:14 AM   #7
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In my opinion the DA*50-135/2.8 does not harmonize so well with the converter. At 135mm, you can live with the IQ, but the quality does not come close to what you are used to from the lens. Better use the DA*200.

Last edited by pid; 05-22-2020 at 07:30 AM.
05-22-2020, 05:54 AM   #8
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I have used it a bit in the past and haven't felt it was a poor match. I haven't really compared side by side results with my 60-250. The purpose for me would be weight savings/flexibility in a smaller kit.

05-22-2020, 07:32 AM   #9
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@ Uncle Vanya: the DA*60-250 is definetly better than the DA*50-135 with the HD Converter
05-23-2020, 04:23 AM   #10
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QuoteOriginally posted by bschriver11 Quote
I was wondering how the DA* 50-135 performs with the Pentax 1.4x converter? I'm planning on getting the DA* 300mm and the 1.4x converter and i'm curious how that works with the DA* 50-135.
I have the Da 50-135mm and the DA 60-250mm
The combination with the DA 60-250mm works very well but I can not recommend the combination with the DA 50-135mm
The amount of CA is amplified by the 1.4 converter
Here 2 pictures of the DA 50-135mm with minimum and maximum focal length
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