Is there any info about PENTAX-DA 1.4X REAR CONVERTER SDM?

Tony.M · 09-29-2009, 06:25 AM

Originally posted by Ishpuini

One thing this TC should do more than other TCs is recalculate the focal length. That way SR would continue to work as efficiently as possible. When I use my Tamron 1.4x now, the SR compensates without knowledge of the TC, hence undercompensating. Unfortunately when a lens passes a focal length to the camera, we cannot change this for SR (only for manual lenses), so there's no way to make SR work correctly with a TC.

A TC with weather sealing and focal length recalculation and full SDM compatibility would probably make me buy the DA*60-250/4.

Wim

It would be great for the DA* 300mm f/4 too.

FullertonImages · 09-29-2009, 09:54 AM

Originally posted by RaduA

I think you're looking at the mounting lens end and not at the camera mount one and sealing at that end is provided by the gasket from the DA* or WR lens (or DA 17-70 for that matter).

Radu

Oh, I do believe you're right. That would make sense. so does the 17-70 have a seal on the lens mount, but doesn't have all the in lens seals of the DA* line? It's not billed as weather sealed, is it? They should have finished the job and made it fully sealed. Seemed like it was definitely a prototype for the DA* line up. It would be awesome for them to rerelease it as a full DA*.

Anyways, a fuller sealed DA* TC would be awesome, and I would so buy one, or two if they mae a x2 TC as well.

thibs · 09-29-2009, 10:57 PM

Originally posted by GeneralBenson

It would be awesome for them to rerelease it as a full DA*.

DA WR would be OK to me.

NickC · 10-01-2009, 06:17 AM

Originally posted by Ash

I couldn't imagine a DA TC not compatible with DA lenses - SDM or not.
Would have to wait and see.
As for WR, it would be an awesome addition to the TC - not sure if it would be a deal-breaker if it wasn't WR though.

The image shows it with the screw drive so it should work with all AF lenses.

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09-29-2009, 06:25 AM	#16
Tony.M Junior Member Join Date: Nov 2008 Location: France Posts: 33	Originally posted by Ishpuini One thing this TC should do more than other TCs is recalculate the focal length. That way SR would continue to work as efficiently as possible. When I use my Tamron 1.4x now, the SR compensates without knowledge of the TC, hence undercompensating. Unfortunately when a lens passes a focal length to the camera, we cannot change this for SR (only for manual lenses), so there's no way to make SR work correctly with a TC. A TC with weather sealing and focal length recalculation and full SDM compatibility would probably make me buy the DA60-250/4. Wim It would be great for the DA 300mm f/4 too.

09-29-2009, 09:54 AM	#17
FullertonImages Veteran Member Join Date: Apr 2009 Location: Boulder, CO Posts: 883	Originally posted by RaduA I think you're looking at the mounting lens end and not at the camera mount one and sealing at that end is provided by the gasket from the DA* or WR lens (or DA 17-70 for that matter). Radu Oh, I do believe you're right. That would make sense. so does the 17-70 have a seal on the lens mount, but doesn't have all the in lens seals of the DA* line? It's not billed as weather sealed, is it? They should have finished the job and made it fully sealed. Seemed like it was definitely a prototype for the DA* line up. It would be awesome for them to rerelease it as a full DA. Anyways, a fuller sealed DA TC would be awesome, and I would so buy one, or two if they mae a x2 TC as well.

09-29-2009, 10:57 PM	#18
thibs Pentaxian Join Date: Jun 2007 Location: Belgium Photos: Albums Posts: 7,001	Originally posted by GeneralBenson It would be awesome for them to rerelease it as a full DA*. DA WR would be OK to me.

10-01-2009, 06:17 AM	#19
NickC Forum Member Join Date: Sep 2006 Posts: 53	Originally posted by Ash I couldn't imagine a DA TC not compatible with DA lenses - SDM or not. Would have to wait and see. As for WR, it would be an awesome addition to the TC - not sure if it would be a deal-breaker if it wasn't WR though. The image shows it with the screw drive so it should work with all AF lenses.