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03-07-2008, 11:54 PM   #16
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Here are a couple of samples using the Tamron 18-250mm
First pic is at 18mm, second pic is at 250mm..





03-07-2008, 11:55 PM   #17
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This lens walks circles around the 50-200 Pentax lens.
03-08-2008, 08:37 AM   #18
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See I keep reading that but no one seems to be able to prove it. In the only real comparison i have seen the 50-200 is clearly the superior lens in it's range.
03-08-2008, 09:15 AM   #19
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QuoteOriginally posted by Alfisti Quote
See I keep reading that but no one seems to be able to prove it. In the only real comparison i have seen the 50-200 is clearly the superior lens in it's range.
Then you should buy the 50-200...It cost half as much anyway, actually, less than half....At the end of the day it comes down to how you want to spend your hard earned money...If in your head, you believe the 50-200 lens to be better and sharper, then you should go this way as it is already in your head....

As for me, I have both...The only thing thing I will say the 50-200 has over the Tamy is focus speed...Thats it.

03-08-2008, 09:19 AM   #20
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Read my first post.

Again though, post some images showing the 18-250 with better IQ than the 50-200?

I am not saying that is not the case, I just have not seen it yet and anyone who says that is the case refuses to post images to prove what they say.
03-08-2008, 11:43 AM   #21
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I don't have them both but I did alot of reading. After all the pictures I saw in different forums and reviews I read and the 6 year warranty, and much better customer service. I went with the Tamron 18-250. I'm not sure why you would want the 50-200 DA but If you want less range for half the price then go for it. We are just here to give you our opinions.
And just think of all the dust and junk that gets into your camera when you change lenses in the field.
03-08-2008, 02:43 PM   #22
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I never really asked for opinions, I asked for comparison images which just one kind person has provided. it is the only place on the web where I have seen comparison images and so far, the 50-200 looks the better lens.

Again, people may do a "lot of reading" and "see a lot of images" but no one can back those statements up with some proof.
03-08-2008, 06:02 PM   #23
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which is better in terms of IQ the pentax or tamron version of the 18-250? and between the sigma 55-200 and pentax 50-200?

03-08-2008, 07:29 PM   #24
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QuoteOriginally posted by Alfisti Quote
I never really asked for opinions,
Please don't take this the wrong way, but what are expecting to get in a ''forum''?
03-09-2008, 07:40 AM   #25
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IMHO colour is the achilles heel of Tamron lenses. I see it in my 70-300 and in Frank's crop as well as your first image above. Tamron seems to skew blue's to a more magenta type grey. Look at Frank's crops and you'll see the colour difference.

The 50-200 is bang on neutral IMHO ......

03-10-2008, 08:43 AM   #26
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Ok, here is a quick and dirty comparison. I didn't bother placing the camera in manual, etc. I shot using program mode, and let the camera figure out the proper exposure. both photos have been resized the same way, and slightly tweaked using SC2 being careful to apply the same value amounts to each.

Pentax 50-200mm. Set to 200mm. f5.6, 1/15 of a second.


Pentax 18-250mm. Set to 200mm. f6.3, 1/10 of a second.


Just a quick comparison between the two lenses. I do know that the 18-250 allows me to focus closer. I took this irreverent photo that the 50-200mm lens would not allow me to take considering the tight confines.


So there you have it, two almost identical photos taken with two different lenses, using the same identical range, and with the same identical contrast levels. Not scientific by any means, but it might help someone out there.
03-10-2008, 08:46 AM   #27
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Thanks, bugger all difference there that's for sure.
03-10-2008, 09:01 AM   #28
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Oh there are differences. Everything is a compromise with optics.

Pentax 50-200mm:
Good
-Faster 200mm, giving you a slight edge in speed and blurry backgrounds.
-Small and light.
-Excellent colour reproduction.
Bad
-Can't be used for macro work unless combined with extension tubes, etc.
-Not as versatile as the 18-250 in use.

Pentax 18-250mm:
Good
-Versatile compared to the other lens.
-IQ seems to be a tad better then the 50-200.
Bad
-Slower lens.
-Larger and weights more then the other lens.
-Tends to have zoom creep when the lens barrel is pointed downwards.
-Slighly cooler colours then the other lens.
-Cost.

That about sums it up. The fact that a super zoom can go toe to toe with a telephoto that is in the range of 50-200 is amazing. Both lenses are good for what they do. That is why I own both.
03-10-2008, 09:27 AM   #29
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QuoteOriginally posted by Alfisti Quote
IMHO colour is the achilles heel of Tamron lenses. I see it in my 70-300 and in Frank's crop as well as your first image above. Tamron seems to skew blue's to a more magenta type grey. Look at Frank's crops and you'll see the colour difference.

The 50-200 is bang on neutral IMHO ......

On both my Calibrated monitors and uncalibrated, I do not see what you see..
Chakos quick synopsis seems to be spot on..Even the slightly cooler colors is pretty accurate but can easily be tamed back by taking the camera out of bright mode.

Really Al, it seems as if though you want to hear that the Pentax 50-200 is a better lens and I am sure that their are some who will say this is so, but from tHOSE i have seen and encountered, that actually have both lenses, that is not the case...

Perhaps you should wait for the new Pentax zoom...I believe it will be 50-300 and under $500.00...I think..
03-10-2008, 09:56 AM   #30
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QuoteOriginally posted by jgredline Quote
Really Al, it seems as if though you want to hear that the Pentax 50-200 is a better lens and I am sure that their are some who will say this is so, but from tHOSE i have seen and encountered, that actually have both lenses, that is not the case...
For the last time, no, I don't really want to hear anything. I want to see the 18-250 at least match the 50-200 across the same range to back up what I am hearing.
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