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11-21-2012, 08:45 AM   #1
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Tamron A18 18-250mm F/3.5-6.3 LD Di-II Aspherical IF AF Lens for Pentax

Hi All,

Does the Tamron A18 18-250mm F/3.5-6.3LD Di-II Aspherical IF AF Lens for Pentax is suitable with full functionality to my K-r?

Is this les recommended as replacement for myoriginal 18-55mm lens or there is another one that is more recommended asall-in-one?

11-21-2012, 08:49 AM   #2
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Yes, it is. You may also want to check out this lens:

Pentax SMC DA 18-135mm F/3.5-5.6 ED AL (IF) DC WR Lens 21977 B&H

There may be a really good deal on it this weekend

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11-21-2012, 08:54 AM   #3
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It is a recommended lens for an all-in-one, as it is as sharp as the 18-55 in that range, and very good throughout. It is better than the 18-200s, 28-300s, and is reasonably sized.

The 18-135WR that Adam is referring you to is also a very good lens and a very good replacement to the 18-55 - with silent focusing.
11-21-2012, 09:05 AM   #4
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Thank you both for your fast reply.

I was looking in eBay for this Tamron lens - Tamron AF 18 250mm F 3 5 6 3 LD DIII Macro for Pentax EXC 4960371004891 | eBay

It seems to be its good price if the lens condition is as described.

What do you think?

11-21-2012, 09:09 AM   #5
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I used the Pentax DA 18-250mm for a couple of years, which is a rebadged Tamron. It's a good lens, about equal to the current Pentax 18-55 kit lenses in the same range (each has advantages over the over, balances out). I now use the DA 18-135mm as my walk around lens because I find it a little better optically and much superior mechanically (faster and silent auto-focus, no zoom lock or creep, much more solid build, weather-resistance).
11-21-2012, 09:18 AM   #6
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Thanks Dan. I was also looking at DA 18-135mm. The 135 looks enough but itseems that it is easier to find a better deal on the Tamron. As far as I knowthe K-r is not WR so I don't understand the importance of WR lens.

I was asking regarding "full functionality"after looking at "Pentax Lens Compatibility Chart" here in this forumand getting confused.

It seems that for the k-r (has Crippled KAF2 mount) with AF lens (and Ithink it is the case with this Tamron) not full functionally is reached (M''',Av | mf).

As I'm new to this I will appreciate some explanations.

Thanks in advanced.
11-21-2012, 09:27 AM   #7
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iAndroid - please don't be confused by the chart. The Tamron 18-250 is a AF lens and will work fully with the k-r. The chart you are looking at is more regarding using older Manual lenses with the newer DSLRS.
11-21-2012, 09:30 AM   #8
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Thanks a lot

12-04-2012, 07:11 AM   #9
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Dear friends,
Thank you all for your help and advices.
I'm currently a proved owner (I will get it unfortunately only in few weeks)of Tamron 18-250mm lens.
I bought it for just above 300$ and according to its description it shouldbe in excellent condition.
I'll try to update as soon I have some experience with it.

12-04-2012, 09:49 AM   #10
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Congrats You will love the additional reach

12-06-2012, 11:12 PM   #11
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using Tamron 18 - 250mm lens

Hi, a word of warning. I use this lens - it is OK, not great but OK for the money - not very sharp and poor contrast at 250mm end of the range. But I use DxO Pro software which I must recommend if you use this lens - it sharpens to images so well that it makes it look like a much better quality lens.

The warning is about focusing at the wide angle setting - the lens focuses approximately, not exactly. For example, focus on anything you like at wide angle, take a note of where the focusing mark shows on the lens barrel, then zoom in and focus again. You will find that the lens now refocuses to a new position, which is more accurate.

This has become my way of using this lens, focus at a zoomed setting and then hold the shutter button and zoom out and take the shot.

The new PZD model of this lens has an improved wide angle focus and I read an announcement that Pentax has or will be releasing their version of this lens.

Also the new Sigma 18 - 250mm has been rated as sharper than the Tamron but I haven't checked to see if it fits the K mount.
12-06-2012, 11:20 PM   #12
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Thanks a lot. Great inputs.
12-08-2012, 12:15 PM   #13
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+1 to what jlaubza said - I get much better results with the 18-250 when I zoom in, focus, and then pull out to compose and shoot.
12-08-2012, 07:03 PM   #14
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Just know that focusing with some zooms at the long end then zooming out doesn't work with every lens. It requires a lens capable of constant focus. With a lot of zoom lenses, the focus will shift as you change the focal length.

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