D FA 70-200mm compatibility with 1.4x L teleconverter

retired2007 · 03-21-2019, 01:50 PM

want to know if the rear converter A2XL will work on a k 1 with the DFA*70-200 f2.8 lens. thanks for any info.

Adam · 03-21-2019, 02:00 PM

I don't believe it will fit since there's an element at the very back of the lens.

retired2007 · 03-21-2019, 03:37 PM

Originally posted by Adam

I don't believe it will fit since there's an element at the very back of the lens.

thank you, would you know or recomend a converter for the DFA* 70-200 and K1 combo?

**UncleVanya** · 03-21-2019, 06:54 PM

Something to try would be the F 1.7 AF converter. It isn't fully AF but it does offer semi Autofocus - you dial in close and then let it finish.

**monochrome** · 03-21-2019, 07:58 PM

I’m away from home, but the A 2x-S might work or the K T6-2X (which is not a great TC for IQ). I can try them Saturday.

Sandy Hancock · 03-21-2019, 09:16 PM

Originally posted by retired2007

thank you, would you know or recommend a converter for the DFA* 70-200 and K1 combo?

A crop camera?

rawr · 03-21-2019, 09:44 PM

The DA 1.4 AW Rear converter TC should also work, particularly with the K-1 shooting in crop mode. The DFA 70-200 is on the list of compatible lenses for that TC:

HD PENTAX-DA AF REAR CONVERTER 1.4X AW / Converter / AF Lens Adapter / K-mount Lenses / Lenses / Products | RICOH IMAGING

**JensE** · 03-22-2019, 04:18 AM

Originally posted by rawr

The DA 1.4 AW Rear converter TC should also work, particularly with the K-1 shooting in crop mode.

I'm afraid it's the only combination which keeps Shake Reduction working correctly - no other converter out there seems to convert the focal length reported by the lens. I don't own that combo, but there have been several posts about the amount of vignetting, which is to be expected. It wasn't entirely limited to the APS-C image, but also not covering the K-1 sensor completely. The newest, relatively speaking, Kenko 1.5x (I use the Pz-AF 1.5X TELEPLUS SHQ, but with a Sigma HSM OS lens) and Tamron 1.4x converters, which have all the necessary contacts, should work, but will cause the SR to under-compensate.

retired2007 · 03-22-2019, 06:11 AM

Originally posted by Sandy Hancock

A crop camera?

no the K1 is full frame

**aslyfox** · 03-22-2019, 06:19 AM

Originally posted by Adam

I don't believe it will fit since there's an element at the very back of the lens.

as noted in the in depth review of the DA 1.4:

" Note that the A1.4X-L rear Converter cannot be used with most lenses including the DA*300mm lens due to the converter's protruding front element. Thus, the DA converter is much more versatile than the older A1.4x-L converter. "

Read more at: Pentax-DA 1.4x AW AF Rear Converter Review - DA 1.4x and A 1.4X-L Compared | PentaxForums.com Reviews

__________________________

this language about the DA 1.4 appears interesting:

" We mounted the converter on a film body and did not notice any particular vignetting in the viewfinder with lenses 20mm or longer. This is not to say that the converter will be usable in practice with a full frame DSLR should Pentax release one, since firmware could prevent its use. "

Read more at: https://www.pentaxforums.com/reviews/pentax-da-14x-aw-af-rear-converter/conc...#ixzz5iuGbH3mJ

has anyone tried the DA 1.4 on the K 1 or K 1 II shooting full frame ?

_______________________________________________________________________

since the OP is from the United States a rental of the DA 1.4 might be one way to test without buying the converter

https://www.pentaxforums.com/forums/137-photographic-industry-professionals/...ml#post4542890

**luftfluss** · 03-22-2019, 06:56 AM

Originally posted by retired2007

no the K1 is full frame

What Sandy is saying - oh so pithily - is the DFA 70-200 mounted to an APS-C camera (like the KP) would be somewhat akin to a K-1 + DFA 70-200 + (theoretical) 1.4x teleconverter.

rawr · 03-22-2019, 07:57 AM

Originally posted by aslyfox

has anyone tried the DA 1.4 on the K 1 or K 1 II shooting full frame ?

Alas there don't seem to be many examples anywhere online of the combo of K-1 + DFA 70-200 + the DA 1.4 TC shooting in either APS-C or FF mode. But there are numerous reports of the DA 1.4 TC performing well in FF mode on K-1 - but the results are very lens dependent..

**UncleVanya** · 03-22-2019, 08:03 AM

Like Sandy mentioned putting it on the Kp, K3, K3ii, K70, etc. will get 24mp into the crop zone of the lens which is more than the 16mp in the crop zone you get from the K1 in crop mode - allowing for higher detail when you need reach. It is likely that the DA 1.4x would work both in K1 crop mode and on the crop cameras without limitations but I don't have any direct evidence of this.

---------- Post added 03-22-19 at 11:07 AM ----------

Originally posted by JensE

I'm afraid it's the only combination which keeps Shake Reduction working correctly - no other converter out there seems to convert the focal length reported by the lens. I don't own that combo, but there have been several posts about the amount of vignetting, which is to be expected. It wasn't entirely limited to the APS-C image, but also not covering the K-1 sensor completely. The newest, relatively speaking, Kenko 1.5x (I use the Pz-AF 1.5X TELEPLUS SHQ, but with a Sigma HSM OS lens) and Tamron 1.4x converters, which have all the necessary contacts, should work, but will cause the SR to under-compensate.

While this is true of the AF TC's the 1.4x-S and 2x-S manual focus converters (A series or not) will not transmit the SR data and allow the body to be set to whatever SR value you want - if manual focus is sufficient.

My past experiments using the 1.4x-S vs. the DA 1.4x lead me to think the 1.4x-S A version is very close to the same performance at least with my FA* 300 f4.5 used on a K-3.

The 1.4x-S should also cover the FF sensor without problems.

normhead · 03-22-2019, 08:29 AM - **2 Likes**

Originally posted by UncleVanya

Like Sandy mentioned putting it on the Kp, K3, K3ii, K70, etc. will get 24mp into the crop zone of the lens which is more than the 16mp in the crop zone you get from the K1 in crop mode - allowing for higher detail when you need reach. It is likely that the DA 1.4x would work both in K1 crop mode and on the crop cameras without limitations but I don't have any direct evidence of this.

---------- Post added 03-22-19 at 11:07 AM ----------

While this is true of the AF TC's the 1.4x-S and 2x-S manual focus converters (A series or not) will not transmit the SR data and allow the body to be set to whatever SR value you want - if manual focus is sufficient.

My past experiments using the 1.4x-S vs. the DA 1.4x lead me to think the 1.4x-S A version is very close to the same performance at least with my FA* 300 f4.5 used on a K-3.

The 1.4x-S should also cover the FF sensor without problems.

The HD DA 1.4 vignetting is quite manageable and often would be cropped in any case. I'm pretty sure mine used with my 60-250 gives me about 28-30 MP files when cropped to avoid vignetting. So you're still better off using the K-1 and 1.4 rather than the K-3 I usually use, as long as the critter is close enough. Just leave a bit of crop room around your subject. And remember, my K-3 images are also often cropped. It's not like I have a pile of images that are 100% un-cropped. Cropping provides more advantages than just removing vignetting. There's a pretty good chance you'd be doing it in any case.

That's how I'd handle it.

I use the 1.4 with my DA*200 often, but, you'll find 280mm isn't really that long on an FF camera.

**UncleVanya** · 03-22-2019, 08:38 AM - **1 Like**

Originally posted by normhead

The HD DA 1.4 vignetting is quite manageable and often would be cropped in any case. I'm pretty sure mine used with my 60-250 gives me about 28-30 MP files when cropped to avoid vignetting. So you're still better off using the K-1 and 1.4 rather than the K-3 I usually use, as long as the critter is close enough. Just leave a bit of crop room around your subject. And remember, my K-3 images are also often cropped. It's not like I have a pile of images that are 100% un-cropped. Cropping provides more advantages than just removing vignetting. There's a pretty good chance you'd be doing it in any case.

That's how I'd handle it.

I use the 1.4 with my DA*200 often, but, you'll find 280mm isn't really that long on an FF camera.

I would defer to Norm - he has a lot of experience with this. Norm what about the F 1.7x converter?

03-21-2019, 01:50 PM	#1
retired2007 Veteran Member Join Date: Aug 2011 Location: new Albany IN Posts: 861	D FA 70-200mm compatibility with 1.4x L teleconverter want to know if the rear converter A2XL will work on a k 1 with the DFA*70-200 f2.8 lens. thanks for any info.

03-21-2019, 02:00 PM	#2
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,593	I don't believe it will fit since there's an element at the very back of the lens. Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

03-21-2019, 07:58 PM	#5
monochrome Loyal Site Supporter Join Date: Mar 2008 Location: Working From Home Photos: Gallery \| Albums Posts: 26,276	I’m away from home, but the A 2x-S might work or the K T6-2X (which is not a great TC for IQ). I can try them Saturday. Last edited by monochrome; 03-21-2019 at 08:05 PM.

03-22-2019, 06:19 AM	#10
aslyfox Seeker of Knowledge Join Date: Aug 2016 Location: Topeka, Kansas Photos: Gallery \| Albums Posts: 24,576	Originally posted by Adam I don't believe it will fit since there's an element at the very back of the lens. as noted in the in depth review of the DA 1.4: " Note that the A1.4X-L rear Converter cannot be used with most lenses including the DA300mm lens due to the converter's protruding front element. Thus, the DA converter is much more versatile than the older A1.4x-L converter. " Read more at: Pentax-DA 1.4x AW AF Rear Converter Review - DA 1.4x and A 1.4X-L Compared \| PentaxForums.com Reviews __________________________ this language about the DA 1.4 appears interesting: " We mounted the converter on a film body and did not notice any particular vignetting in the viewfinder with lenses 20mm or longer. This is not to say that the converter will be usable in practice with a full frame DSLR should Pentax release one, since firmware could prevent its use. " Read more at: https://www.pentaxforums.com/reviews/pentax-da-14x-aw-af-rear-converter/conc...#ixzz5iuGbH3mJ has anyone tried the DA 1.4 on the K 1 or K 1 II shooting full frame ? _______________________________________________________________________ since the OP is from the United States a rental of the DA 1.4 might be one way to test without buying the converter https://www.pentaxforums.com/forums/137-photographic-industry-professionals/...ml#post4542890 Last edited by aslyfox; 03-22-2019 at 06:32 AM.*

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03-21-2019, 03:37 PM	#3
retired2007 Veteran Member Join Date: Aug 2011 Location: new Albany IN Posts: 861 Original Poster	Originally posted by Adam I don't believe it will fit since there's an element at the very back of the lens. thank you, would you know or recomend a converter for the DFA* 70-200 and K1 combo?

03-21-2019, 06:54 PM	#4
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,381	Something to try would be the F 1.7 AF converter. It isn't fully AF but it does offer semi Autofocus - you dial in close and then let it finish.

03-21-2019, 09:16 PM	#6
Sandy Hancock Moderator Site Supporter Join Date: Feb 2012 Location: Adelaide Hills, South Australia Photos: Gallery \| Albums Posts: 11,267	Originally posted by retired2007 thank you, would you know or recommend a converter for the DFA* 70-200 and K1 combo? A crop camera?

03-21-2019, 09:44 PM	#7
rawr Veteran Member Join Date: Jun 2009 Posts: 11,913	The DA 1.4 AW Rear converter TC should also work, particularly with the K-1 shooting in crop mode. The DFA 70-200 is on the list of compatible lenses for that TC: HD PENTAX-DA AF REAR CONVERTER 1.4X AW / Converter / AF Lens Adapter / K-mount Lenses / Lenses / Products \| RICOH IMAGING

03-22-2019, 04:18 AM	#8
JensE Site Supporter Join Date: Dec 2015 Location: Leipzig Photos: Gallery \| Albums Posts: 1,964	Originally posted by rawr The DA 1.4 AW Rear converter TC should also work, particularly with the K-1 shooting in crop mode. I'm afraid it's the only combination which keeps Shake Reduction working correctly - no other converter out there seems to convert the focal length reported by the lens. I don't own that combo, but there have been several posts about the amount of vignetting, which is to be expected. It wasn't entirely limited to the APS-C image, but also not covering the K-1 sensor completely. The newest, relatively speaking, Kenko 1.5x (I use the Pz-AF 1.5X TELEPLUS SHQ, but with a Sigma HSM OS lens) and Tamron 1.4x converters, which have all the necessary contacts, should work, but will cause the SR to under-compensate.

03-22-2019, 06:11 AM	#9
retired2007 Veteran Member Join Date: Aug 2011 Location: new Albany IN Posts: 861 Original Poster	Originally posted by Sandy Hancock A crop camera? no the K1 is full frame

03-22-2019, 06:56 AM	#11
luftfluss Site Supporter Join Date: Jun 2011 Location: NJ Photos: Gallery \| Albums Posts: 11,618	Originally posted by retired2007 no the K1 is full frame What Sandy is saying - oh so pithily - is the DFA 70-200 mounted to an APS-C camera (like the KP) would be somewhat akin to a K-1 + DFA 70-200 + (theoretical) 1.4x teleconverter.

03-22-2019, 07:57 AM	#12
rawr Veteran Member Join Date: Jun 2009 Posts: 11,913	Originally posted by aslyfox has anyone tried the DA 1.4 on the K 1 or K 1 II shooting full frame ? Alas there don't seem to be many examples anywhere online of the combo of K-1 + DFA 70-200 + the DA 1.4 TC shooting in either APS-C or FF mode. But there are numerous reports of the DA 1.4 TC performing well in FF mode on K-1 - but the results are very lens dependent..

03-22-2019, 08:03 AM	#13
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,381	Like Sandy mentioned putting it on the Kp, K3, K3ii, K70, etc. will get 24mp into the crop zone of the lens which is more than the 16mp in the crop zone you get from the K1 in crop mode - allowing for higher detail when you need reach. It is likely that the DA 1.4x would work both in K1 crop mode and on the crop cameras without limitations but I don't have any direct evidence of this. ---------- Post added 03-22-19 at 11:07 AM ---------- Originally posted by JensE I'm afraid it's the only combination which keeps Shake Reduction working correctly - no other converter out there seems to convert the focal length reported by the lens. I don't own that combo, but there have been several posts about the amount of vignetting, which is to be expected. It wasn't entirely limited to the APS-C image, but also not covering the K-1 sensor completely. The newest, relatively speaking, Kenko 1.5x (I use the Pz-AF 1.5X TELEPLUS SHQ, but with a Sigma HSM OS lens) and Tamron 1.4x converters, which have all the necessary contacts, should work, but will cause the SR to under-compensate. While this is true of the AF TC's the 1.4x-S and 2x-S manual focus converters (A series or not) will not transmit the SR data and allow the body to be set to whatever SR value you want - if manual focus is sufficient. My past experiments using the 1.4x-S vs. the DA 1.4x lead me to think the 1.4x-S A version is very close to the same performance at least with my FA* 300 f4.5 used on a K-3. The 1.4x-S should also cover the FF sensor without problems.

03-22-2019, 08:29 AM - 2 Likes	#14
normhead Pentaxian Join Date: Jun 2007 Location: Near Algonquin Park Photos: Gallery \| Albums Posts: 40,448	Originally posted by UncleVanya Like Sandy mentioned putting it on the Kp, K3, K3ii, K70, etc. will get 24mp into the crop zone of the lens which is more than the 16mp in the crop zone you get from the K1 in crop mode - allowing for higher detail when you need reach. It is likely that the DA 1.4x would work both in K1 crop mode and on the crop cameras without limitations but I don't have any direct evidence of this. ---------- Post added 03-22-19 at 11:07 AM ---------- While this is true of the AF TC's the 1.4x-S and 2x-S manual focus converters (A series or not) will not transmit the SR data and allow the body to be set to whatever SR value you want - if manual focus is sufficient. My past experiments using the 1.4x-S vs. the DA 1.4x lead me to think the 1.4x-S A version is very close to the same performance at least with my FA* 300 f4.5 used on a K-3. The 1.4x-S should also cover the FF sensor without problems. The HD DA 1.4 vignetting is quite manageable and often would be cropped in any case. I'm pretty sure mine used with my 60-250 gives me about 28-30 MP files when cropped to avoid vignetting. So you're still better off using the K-1 and 1.4 rather than the K-3 I usually use, as long as the critter is close enough. Just leave a bit of crop room around your subject. And remember, my K-3 images are also often cropped. It's not like I have a pile of images that are 100% un-cropped. Cropping provides more advantages than just removing vignetting. There's a pretty good chance you'd be doing it in any case. That's how I'd handle it. I use the 1.4 with my DA*200 often, but, you'll find 280mm isn't really that long on an FF camera.

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03-22-2019, 08:38 AM - 1 Like	#15
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,381	Originally posted by normhead The HD DA 1.4 vignetting is quite manageable and often would be cropped in any case. I'm pretty sure mine used with my 60-250 gives me about 28-30 MP files when cropped to avoid vignetting. So you're still better off using the K-1 and 1.4 rather than the K-3 I usually use, as long as the critter is close enough. Just leave a bit of crop room around your subject. And remember, my K-3 images are also often cropped. It's not like I have a pile of images that are 100% un-cropped. Cropping provides more advantages than just removing vignetting. There's a pretty good chance you'd be doing it in any case. That's how I'd handle it. I use the 1.4 with my DA*200 often, but, you'll find 280mm isn't really that long on an FF camera. I would defer to Norm - he has a lot of experience with this. Norm what about the F 1.7x converter?