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05-31-2010, 05:36 PM   #1
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Teleconverte with Da*

Will the Pentax | SMCP-DA* 50-135mm f/2.8 ED (IF) SDM Autofocus | 21660 work with this

Kenko | 1.5x DG AF Tele-Converter for Pentax AF | K1.5AF DGPK


I have seen other threads where the user indicated that the auto functions fail to work together

06-01-2010, 06:52 AM   #2
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Hello,

Since the lens is an f2.8 model, it will work. Kenko states;

"This DG teleconverter has upgraded "Gate-Array IC" circuitry to work better with digital SLR's and some of the digital SLR lenses. This means that the converter's unique circuitry maintains signal integrity between the camera body and lens."

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06-03-2010, 02:55 AM   #3
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But the Kenko-Converters doesn´t work with AF at SDM-Lenses. I tried it with the Kenko and the DA* 300.

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06-03-2010, 04:24 AM   #4
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Only the older model I believe will work with SDM/HSM lenses. Pz-Af SHQ telplus. It has to have the power zoom contacts to operate SDM.

06-03-2010, 10:23 AM   #5
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QuoteOriginally posted by OrenMc Quote
Only the older model I believe will work with SDM/HSM lenses. Pz-Af SHQ telplus. It has to have the power zoom contacts to operate SDM.
It has to have more than just the pz contacts to operate the sdm whether its Kenko, Tamron or other.
06-04-2010, 08:13 AM   #6
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QuoteOriginally posted by Blue Quote
It has to have more than just the pz contacts to operate the sdm whether its Kenko, Tamron or other.
Not sure what you are saying. The newer model 1.5X DG AF Telplus MC does not have the PZ,SDM,HSM contacts, that why it dosn't work with SDM lenses.
Common sense implies the need for the other contacts for metering, aperture control and such.
I didn't say the only contacts needed were the power zoom contacts.
Sorry for the misunderstanding.

They need the added contacts circled in red

Last edited by OrenMc; 06-04-2010 at 08:20 AM.
06-04-2010, 09:05 AM   #7
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QuoteOriginally posted by OrenMc Quote
Not sure what you are saying. The newer model 1.5X DG AF Telplus MC does not have the PZ,SDM,HSM contacts, that why it dosn't work with SDM lenses.
Common sense implies the need for the other contacts for metering, aperture control and such.
I didn't say the only contacts needed were the power zoom contacts.
Sorry for the misunderstanding.

They need the added contacts circled in red
What I was saying is that there are versions of the Kenko and other TC that have the power zoom contacts that do not support SDM. I had a 1.5 Kenko and a Tamron 2x (a nice tc btw) that had the power zoom contacts but neither would support SDM. I had them prior to getting a SDM lens and sold them afterward.

I don't have pics of my Kenko handy. Here is the Tammy. It does NOT support SDM but has the zoom contacts.





Last edited by Blue; 06-04-2010 at 11:50 AM.
06-04-2010, 10:03 AM   #8
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I will try to dig up the thread that has the data for most TCs and compatability with SDM lens.
Most informitive.
Not sure which camera you are using and the settting you have enable but the tamron works well with the Da* 300/4. Works with my Da* 16-50 also.

06-04-2010, 11:03 AM   #9
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I have the Tamron-F 1.4X Pz-AF MC4 and the DA*300 with this combo SDM works.
06-04-2010, 11:50 AM   #10
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QuoteOriginally posted by gdog Quote
I have the Tamron-F 1.4X Pz-AF MC4 and the DA*300 with this combo SDM works.
The above Tammy 2x PZ-AF MC-7 DID NOT work with my DA* 300mm. You guys operate under the assumption that if a tc has the contacts for PZ, it will also support SDM which isn't always the case.

QuoteOriginally posted by OrenMc Quote
I will try to dig up the thread that has the data for most TCs and compatability with SDM lens.
Most informitive.
Not sure which camera you are using and the settting you have enable but the tamron works well with the Da* 300/4. Works with my Da* 16-50 also.
K20d and K200d with the DA* 300mm.

I had this problem with the Kenko DG Pz-AF 1.5x TELEPLUS MC as well. I don't why you even bring up setting.


Edit: The point I'm trying to make here, there is more to it working with SDM than JUST the PZ contacts. There were 2 previous 1.5x Kenko models.

1. Kenko DG Pz-AF 1.5x TELEPLUS MC

2. Kenko Pz-AF 1.5x TELEPLUS SHQ

Last edited by Blue; 06-04-2010 at 11:58 AM.
06-04-2010, 11:55 AM   #11
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QuoteOriginally posted by gdog Quote
I have the Tamron-F 1.4X Pz-AF MC4 and the DA*300 with this combo SDM works.
I can also confirm the Tamron-F 1.4x Pz-AF MC4 works with the DA* lenses. Specifically I've used it with the DA*200, DA*300, DA*50-135 and DA*60-250. Keep in mind it's not perfect and doesn't always lock on the first try. I find that in practice manually focusing close to the target (if you are refocusing on something much closer/further than where the lens is currently focued) and then using AF gives the best results. Also, I found the TC tends to work best with the 300 and has the most trouble getting a lock with the 50-135.

QuoteOriginally posted by Blue Quote
The above Tammy 2x PZ-AF MC-7 DID NOT work with my DA* 300mm. You guys operate under the assumption that if a tc has the contacts for PZ, it will also support SDM which isn't always the case.
FWIW, I was not able to use the AF with my DA* lenses and the Tammy 2x PZ-AF MC-7 either.
06-04-2010, 12:08 PM   #12
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One from today da*300+Tamron 1.4X Pz-AF MC4, no manual focus.

06-04-2010, 06:06 PM   #13
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QuoteOriginally posted by Blue Quote
The above Tammy 2x PZ-AF MC-7 DID NOT work with my DA* 300mm. You guys operate under the assumption that if a tc has the contacts for PZ, it will also support SDM which isn't always the case.



K20d and K200d with the DA* 300mm.

I had this problem with the Kenko DG Pz-AF 1.5x TELEPLUS MC as well. I don't why you even bring up setting.


Edit: The point I'm trying to make here, there is more to it working with SDM than JUST the PZ contacts. There were 2 previous 1.5x Kenko models.

1. Kenko DG Pz-AF 1.5x TELEPLUS MC
2. Kenko Pz-AF 1.5x TELEPLUS SHQ

You are true to say that there is some incompatibility if a few cases. I had a problem with the Sigma 70-200 hsm,it would work but only sometimes.

Okay, I found the thread tamron-tc-converter-pics.html

I have heard the current kenko DG AF 1,5x mc does not support sdm/hsm.

I believe the K20 and other some cameras need and updated firmware to operate SDM lenes.

Just like Sigma will tell you the 1,4 tc will function with the new HSM lense. NOT TRUE

.

Last edited by OrenMc; 06-06-2010 at 06:01 AM.
06-05-2010, 06:27 PM   #14
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QuoteOriginally posted by Blue Quote
Edit: The point I'm trying to make here, there is more to it working with SDM than JUST the PZ contacts. There were 2 previous 1.5x Kenko models.

1. Kenko DG Pz-AF 1.5x TELEPLUS MC

2. Kenko Pz-AF 1.5x TELEPLUS SHQ

Understood, I quess there is a pin variation also , 6 VS 7 pins.
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