Ordered the Tamron 17-50!

**1979w72** · 04-05-2008, 12:05 PM

I made it to the camera shop this morning and tried out a couple of shots on a K20D with the Tammy and had similar results as from my K10D. Sample posted at Tammy/K20D

Stratario · 04-05-2008, 12:25 PM

With all due respect you are giving this lens a bad rap with a flawed test. Your last two shots with the K20D have a strong reflection of the sun on the blue car on the lower right side. We all know that Pentax cameras react rather strongly by cutting down on the exposure to keep the bright spots from getting blown out.

Secondly, have you tried this test with any other lens, the kit lens for example? Are you getting perfectly even exposure with other lenses?

**1979w72** · 04-05-2008, 01:35 PM

Originally posted by Stratario

a strong reflection of the sun on the blue car on the lower right side

Thanks, that an interesting catch - I hadn't noticed that. I definitely should have set it to spot metering.

Originally posted by Stratario

Secondly, have you tried this test with any other lens, the kit lens for example? Are you getting perfectly even exposure with other lenses?

I didn't try another lens today, but there are a couple of sets that share a common subject using the Tamron 17-50 and 18-200 from a few days ago at 17-50 and 18-200. The 18-200 seems to hold more constant in those. I've also shot a few against the DA 50-200, which seemed to maintain a more consistent exposure.

Stratario · 04-05-2008, 01:47 PM

Well, I have one on special order from a local dealer. I'm hoping and praying that it would be alright. I can live with a little inconsistancy in exposure, as I shoot only in RAW. But I don't think I can tolerate FF or BF.

jake123 · 04-05-2008, 03:51 PM

Originally posted by 1979w72

I made it to the camera shop this morning and tried out a couple of shots on a K20D with the Tammy and had similar results as from my K10D. Sample posted at Tammy/K20D

Thanks for all the tests. So the two main problems are: bf/ff when in tungsten but not daylight, underexposing as aperture is stopped down.

Are these flaws that cannot be corrected with warranty?

What about other samples?

Pentaxke · 04-06-2008, 02:38 AM

I have the 21 limited myself, which I picked up for little...

At first I didn't think much of it, but by now I really love it. Its' optical performance is excellent as well as handling. This is definitely a keeper for me... Enjoy!

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04-05-2008, 12:05 PM	#16
1979w72 Site Supporter Join Date: Jul 2007 Location: Cincinnati, OH Posts: 16	I made it to the camera shop this morning and tried out a couple of shots on a K20D with the Tammy and had similar results as from my K10D. Sample posted at Tammy/K20D

04-05-2008, 12:25 PM	#17
Stratario Veteran Member Join Date: Mar 2008 Location: Ontario, Canada Photos: Gallery Posts: 366	With all due respect you are giving this lens a bad rap with a flawed test. Your last two shots with the K20D have a strong reflection of the sun on the blue car on the lower right side. We all know that Pentax cameras react rather strongly by cutting down on the exposure to keep the bright spots from getting blown out. Secondly, have you tried this test with any other lens, the kit lens for example? Are you getting perfectly even exposure with other lenses?

04-05-2008, 01:35 PM	#18
1979w72 Site Supporter Join Date: Jul 2007 Location: Cincinnati, OH Posts: 16	Originally posted by Stratario a strong reflection of the sun on the blue car on the lower right side Thanks, that an interesting catch - I hadn't noticed that. I definitely should have set it to spot metering. Originally posted by Stratario Secondly, have you tried this test with any other lens, the kit lens for example? Are you getting perfectly even exposure with other lenses? I didn't try another lens today, but there are a couple of sets that share a common subject using the Tamron 17-50 and 18-200 from a few days ago at 17-50 and 18-200. The 18-200 seems to hold more constant in those. I've also shot a few against the DA 50-200, which seemed to maintain a more consistent exposure.

04-05-2008, 01:47 PM	#19
Stratario Veteran Member Join Date: Mar 2008 Location: Ontario, Canada Photos: Gallery Posts: 366	Well, I have one on special order from a local dealer. I'm hoping and praying that it would be alright. I can live with a little inconsistancy in exposure, as I shoot only in RAW. But I don't think I can tolerate FF or BF.

04-05-2008, 03:51 PM	#20
jake123 Senior Member Join Date: Sep 2007 Location: Vancouver, BC, Canada Posts: 130	Originally posted by 1979w72 I made it to the camera shop this morning and tried out a couple of shots on a K20D with the Tammy and had similar results as from my K10D. Sample posted at Tammy/K20D Thanks for all the tests. So the two main problems are: bf/ff when in tungsten but not daylight, underexposing as aperture is stopped down. Are these flaws that cannot be corrected with warranty? What about other samples?

04-06-2008, 02:38 AM	#21
Pentaxke Veteran Member Join Date: Oct 2006 Location: Belgium Photos: Gallery \| Albums Posts: 476	I have the 21 limited myself, which I picked up for little... At first I didn't think much of it, but by now I really love it. Its' optical performance is excellent as well as handling. This is definitely a keeper for me... Enjoy!