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rdrum76 · 10-27-2008, 07:49 PM

DA 1.4x rear convertor sdm w/ DA 300?

is this combo realistic for good IQ?

the 1.4 is only one stop lost?

the new DA convertor coming out with be compatible with the DA lenses?

this combo should make the 300mm a 450mm with 5.6 instead of a 4 aperture?

there should be enough light for AF?

thanks to any and all answers

rdrum76 · 10-27-2008, 08:59 PM

I want to shoot wildlife e.g. wolves, bears, and bisons; for birds I am guessing at least a 500mm; thanks

koper · 10-28-2008, 05:26 AM

tamron 1.4x rear convertor work with the lens DA 300
the focus works slower
you can find the teleconverter on ebay

Miserere · 10-28-2008, 08:33 AM

DA* 300mm f/4 + 1.4x TC = 420mm f/5.6.

I'm hoping the Pentax TC will multiply the focal length so the SR in the camera knows the attached lens is 420mm and not 300mm.

John Kovarik · 10-28-2008, 08:59 AM

That would be nice, Mis, but I am pretty satisfied with The Tamron on both the DA* 200 and 300. Is there any reason to think there will be major IQ imrovement also? My only experience is with the 1.7 F-AF and I have not tried that with the DA*s but on other lenses it seems no more than equivalent to the Tamron.............

Miserere · 10-28-2008, 09:46 AM

Originally posted by John Kovarik

That would be nice, Mis, but I am pretty satisfied with The Tamron on both the DA* 200 and 300. Is there any reason to think there will be major IQ imrovement also?

I'm also very happy with the IQ of the Tamron 1.4x TC and I would be very suprised if it could be improved on by Pentax. My only reason for selling the Tamron and getting the new Pentax would be if the Pentax multiplied the focal length by 1.4. But I don't think I use it enough to warrant the extra expenditure anyway. I'm just happy Pentax are showing a commitment to a complete system.

Mike.P® · 10-28-2008, 10:38 AM

It wouldnt suprise me if the Pentax converter is just the Tamron rebadged anyway.

Wulifou · 10-28-2008, 11:34 AM

Originally posted by Mike.P®

It wouldnt suprise me if the Pentax converter is just the Tamron rebadged anyway.

Does the tamron converter allow SDM ???? I wouldn't have to wait for the Pentax then ......

Miserere · 10-28-2008, 12:52 PM

Originally posted by Wulifou

Does the tamron converter allow SDM ???? I wouldn't have to wait for the Pentax then ......

Seems like it...if you have the MC4 version. There are issues with the other version. Everything you ever wanted to know about the Tamron 14x TC and how it performs with various lenses is right here.

10-27-2008, 07:49 PM	#1
rdrum76 Inactive Account Join Date: May 2007 Posts: 221	DA 1.4x rear convertor sdm w/ DA 300? DA 1.4x rear convertor sdm w/ DA 300? is this combo realistic for good IQ? the 1.4 is only one stop lost? the new DA convertor coming out with be compatible with the DA lenses? this combo should make the 300mm a 450mm with 5.6 instead of a 4 aperture? there should be enough light for AF? thanks to any and all answers

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10-27-2008, 08:59 PM	#2
rdrum76 Inactive Account Join Date: May 2007 Posts: 221 Original Poster	I want to shoot wildlife e.g. wolves, bears, and bisons; for birds I am guessing at least a 500mm; thanks

10-28-2008, 05:26 AM	#3
koper Senior Member Join Date: Jul 2008 Location: israel Photos: Gallery Posts: 180	tamron 1.4x rear convertor work with the lens DA 300 the focus works slower you can find the teleconverter on ebay

10-28-2008, 08:33 AM	#4
Miserere Veteran Member Join Date: Sep 2007 Location: Boston Photos: Gallery Posts: 1,993	DA* 300mm f/4 + 1.4x TC = 420mm f/5.6. I'm hoping the Pentax TC will multiply the focal length so the SR in the camera knows the attached lens is 420mm and not 300mm.

10-28-2008, 08:59 AM	#5
John Kovarik Veteran Member Join Date: Sep 2007 Location: West Virginia Photos: Gallery Posts: 338	That would be nice, Mis, but I am pretty satisfied with The Tamron on both the DA* 200 and 300. Is there any reason to think there will be major IQ imrovement also? My only experience is with the 1.7 F-AF and I have not tried that with the DA*s but on other lenses it seems no more than equivalent to the Tamron.............

10-28-2008, 09:46 AM	#6
Miserere Veteran Member Join Date: Sep 2007 Location: Boston Photos: Gallery Posts: 1,993	Originally posted by John Kovarik That would be nice, Mis, but I am pretty satisfied with The Tamron on both the DA* 200 and 300. Is there any reason to think there will be major IQ imrovement also? I'm also very happy with the IQ of the Tamron 1.4x TC and I would be very suprised if it could be improved on by Pentax. My only reason for selling the Tamron and getting the new Pentax would be if the Pentax multiplied the focal length by 1.4. But I don't think I use it enough to warrant the extra expenditure anyway. I'm just happy Pentax are showing a commitment to a complete system.

10-28-2008, 10:38 AM	#7
Mike.P® Veteran Member Join Date: Mar 2008 Location: New Milton, Hampshire, UK Photos: Gallery \| Albums Posts: 2,154	It wouldnt suprise me if the Pentax converter is just the Tamron rebadged anyway.

10-28-2008, 11:34 AM	#8
Wulifou Forum Member Join Date: Oct 2008 Location: France and Germany Photos: Albums Posts: 73	Originally posted by Mike.P® It wouldnt suprise me if the Pentax converter is just the Tamron rebadged anyway. Does the tamron converter allow SDM ???? I wouldn't have to wait for the Pentax then ......

10-28-2008, 12:52 PM	#9
Miserere Veteran Member Join Date: Sep 2007 Location: Boston Photos: Gallery Posts: 1,993	Originally posted by Wulifou Does the tamron converter allow SDM ???? I wouldn't have to wait for the Pentax then ...... Seems like it...if you have the MC4 version. There are issues with the other version. Everything you ever wanted to know about the Tamron 14x TC and how it performs with various lenses is right here.