tamron 28-75 f2.8 with 2X telecon. - brilliant or stupid?

123K10D · 11-26-2007, 03:00 PM

brilliant or stupid?

rather than get a DA*50-135, i'm thinking of getting a tamron 28-75 f2.8 and the best 2X teleconverter i can find.

purely for the range increase over the DA*. will the IQ suffer too much? ie: brilliant or stupid idea? thanks for any input from those experienced with teleconverters.

Buddha Jones · 11-26-2007, 05:10 PM

Yes, IQ will suffer, from what I hear the 2x TC's are not very good for retaining the intended IQ and you would lose the f/2.8 taking you back to like 5.6. If it were me, I would not do it.

SupremeMoFo · 11-27-2007, 02:55 AM

Yep, forget it. Better off with a Pentax 50-200 f4-5.6.

worthyhuang · 11-27-2007, 10:27 AM

err..you can just try...

Peter Zack · 11-27-2007, 11:18 AM

Well maybe this has some merit. You will loose speed of course but I have the Pentax AF1.7 TC which would give you about 128mm. I've never put the 2 together but if you want I'll do a little testing on the weekend.

I find that TC to be excellent with very little loss of IQ. Maybe not as long as you wanted and these TC"s can cost $400 or so.

SupremeMoFo · 11-27-2007, 06:00 PM

Tamron SP AF 2x teleconverter 7MC, $319.
Sigma EX DG APO 2x teleconverter, $393.
These give you a 56-150mm f5.6 zoom

Or you could get a Pentax 50-200mm f4-5.6 for $383. Or a Tamron 70-300 f4-5.6 for $230. Or Sigma's similar 70-300 DG APO for $342. Makes no sense at all.

Buddha Jones · 11-27-2007, 07:27 PM

If you are willing to spen $383 on a Pentax DA 50-200, I will sell you mine for $300 shipped! Overnight!

egordon99 · 11-27-2007, 07:32 PM

I believe Mr. Mofo is in Australia, and they use different money than us US folks

As to the original question, Stupid (hey, you asked!) You'll get a SLOW f/5.6 56-150mm zoom, with degraded optics. Keep your Tamron 28-75mm (great lens!) and pick up one of the 50/70-200/300mm telezooms.

SupremeMoFo · 11-28-2007, 12:29 AM

Originally posted by Buddha Jones

If you are willing to spen $383 on a Pentax DA 50-200, I will sell you mine for $300 shipped! Overnight!

As egordon observed yes this is Australian money I'm talking, as the OP is Australian too. As the exchange rate stands now, the US$230 pricetag for the same lens is AU$263. However 5 years ago 1US$ was worth as little as AU$0.52, it's now AU$0.87 but of course the price of imported goods doesn't change to reflect that.

Buddha Jones · 11-28-2007, 07:27 AM

HEHEHE!!! Sorry, all I saw was the $$, I guess I do have a price.

11-26-2007, 03:00 PM	#1
123K10D Inactive Account Join Date: Oct 2007 Location: Toowoomba - Australia Posts: 110	tamron 28-75 f2.8 with 2X telecon. - brilliant or stupid? brilliant or stupid? rather than get a DA50-135, i'm thinking of getting a tamron 28-75 f2.8 and the best 2X teleconverter i can find. purely for the range increase over the DA. will the IQ suffer too much? ie: brilliant or stupid idea? thanks for any input from those experienced with teleconverters.

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11-26-2007, 05:10 PM	#2
Buddha Jones Veteran Member Join Date: Sep 2006 Location: Charlotte, NC Photos: Gallery Posts: 2,587	Yes, IQ will suffer, from what I hear the 2x TC's are not very good for retaining the intended IQ and you would lose the f/2.8 taking you back to like 5.6. If it were me, I would not do it.

11-27-2007, 02:55 AM	#3
SupremeMoFo Veteran Member Join Date: Mar 2007 Location: Queensland, Australia Posts: 668	Yep, forget it. Better off with a Pentax 50-200 f4-5.6.

11-27-2007, 10:27 AM	#4
worthyhuang New Member Join Date: Nov 2007 Location: Shanghai,China Posts: 2	err..you can just try...

11-27-2007, 11:18 AM	#5
Peter Zack Pentaxian Moderator Emeritus Join Date: May 2007 Location: Edmonton Alberta, Canada Photos: Gallery \| Albums Posts: 10,643	Well maybe this has some merit. You will loose speed of course but I have the Pentax AF1.7 TC which would give you about 128mm. I've never put the 2 together but if you want I'll do a little testing on the weekend. I find that TC to be excellent with very little loss of IQ. Maybe not as long as you wanted and these TC"s can cost $400 or so.

11-27-2007, 06:00 PM	#6
SupremeMoFo Veteran Member Join Date: Mar 2007 Location: Queensland, Australia Posts: 668	Tamron SP AF 2x teleconverter 7MC, $319. Sigma EX DG APO 2x teleconverter, $393. These give you a 56-150mm f5.6 zoom Or you could get a Pentax 50-200mm f4-5.6 for $383. Or a Tamron 70-300 f4-5.6 for $230. Or Sigma's similar 70-300 DG APO for $342. Makes no sense at all.

11-27-2007, 07:27 PM	#7
Buddha Jones Veteran Member Join Date: Sep 2006 Location: Charlotte, NC Photos: Gallery Posts: 2,587	If you are willing to spen $383 on a Pentax DA 50-200, I will sell you mine for $300 shipped! Overnight!

11-27-2007, 07:32 PM	#8
egordon99 Inactive Account Join Date: Dec 2006 Location: Outside of Philly Posts: 1,561	I believe Mr. Mofo is in Australia, and they use different money than us US folks As to the original question, Stupid (hey, you asked!) You'll get a SLOW f/5.6 56-150mm zoom, with degraded optics. Keep your Tamron 28-75mm (great lens!) and pick up one of the 50/70-200/300mm telezooms.

11-28-2007, 12:29 AM	#9
SupremeMoFo Veteran Member Join Date: Mar 2007 Location: Queensland, Australia Posts: 668	Originally posted by Buddha Jones If you are willing to spen $383 on a Pentax DA 50-200, I will sell you mine for $300 shipped! Overnight! As egordon observed yes this is Australian money I'm talking, as the OP is Australian too. As the exchange rate stands now, the US$230 pricetag for the same lens is AU$263. However 5 years ago 1US$ was worth as little as AU$0.52, it's now AU$0.87 but of course the price of imported goods doesn't change to reflect that.

11-28-2007, 07:27 AM	#10
Buddha Jones Veteran Member Join Date: Sep 2006 Location: Charlotte, NC Photos: Gallery Posts: 2,587	HEHEHE!!! Sorry, all I saw was the $$, I guess I do have a price.

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