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Old Dec 29, 2006, 7:56 AM   #1
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After doing some research online about zoom lenses for my K100d I ended up getting a Tamron 70-300 LD Di from B&H. I love the feel of the lens and it produces fine photos. My only question is that indoors it seems kind of slow and sometimes hunts around to focus, is that normal? Not sure if all zooms in that range are like that. Seems a little better at the low end. Any assistance would be appreciated. Thanks.
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Old Dec 29, 2006, 8:59 AM   #2
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that's normal for indoors. your widest aperture is probably f4 at the LOW end and f5.6 at the HI end. that's why it hunts less at 70mm= more light available. if you get a larger aperture zoom it will be better but be sure your wallet is FAT.

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Old Dec 29, 2006, 9:07 AM   #3
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Do you have this lens? how have your experiences been? Any examples?


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Old Dec 29, 2006, 9:14 AM   #4
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i don't have it. just answering your question..

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Old Dec 29, 2006, 10:23 AM   #5
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Hi, I have that lens, and like you, I like it a lot. I use it mostly outdoors though. I think it is too long for indoor shooting, personally, unless you are talking about shooting performances of some sort. I have only had the lense for a few weeks so I am not experienced enough with it to tell you how it performs indoor. But, unless you are using the K10D, one thing you may want to try is using more powerful batteries. Reportedly this helps with focusing speed quite a bit. Although, I guess it won't help much if the lens can't achieve focus at all.

I finally decided to get a Katzeye focusing screen to help me manual focus in dificult situations, and I am very happy with it. Maybe this will help you too.
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Old Dec 29, 2006, 10:49 AM   #6
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I don't think the Katzeye is an option with the K100d. Why did you pick the Tamron over the Pentax or the Sigma?
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Old Dec 29, 2006, 11:42 AM   #7
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Yes it's something I've noticed with my Tamron 28-200mm too, the AF tends to hunt a little more, especially when there's little to no detail in the pic. Although I think that last issue is mainly because my DL only has 3 AF-pints to choose from.
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Old Dec 29, 2006, 12:00 PM   #8
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pcfranchina wrote:
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I don't think the Katzeye is an option with the K100d. Why did you pick the Tamron over the Pentax or the Sigma?
I have one (Tamron) also, just recently got it, and haven't taken that many pics yet with it, but so far, so good. I chose it mainly for price - the reviews I read for the most part put it on par with the Sigma. I have posted one pic on this thread, of the Bighorn Sheep.

http://www.stevesforums.com/forums/v...mp;forum_id=80
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Old Dec 29, 2006, 12:22 PM   #9
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pcfranchina wrote:
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I don't think the Katzeye is an option with the K100d. Why did you pick the Tamron over the Pentax or the Sigma?
Well, actually, the Katzeye screen is available for the K100. See here:

http://www.katzeyeoptics.com/cat--Pe...at_pentax.html

Initially I was going to get the Pentax 50-200, but after trying it out in the store I realized it was not going to be long enough for what I wanted. I then saw some sample pics from a user in DPreview that showed it is very sharp at 300 mm. Then I saw its price and I had no need to look any further. So, I never considered or looked into the Sigma. One thing I did read was that the new Tamron 70-300, the Di version, is sharper than the old version. So, the choice was clear for me.

Here are a couple of samples that I have taken with it Please note that they were all hand held.

First, at 70 mm:
http://i45.photobucket.com/albums/f9...GP2094-web.jpg

This one is at 90 mm:
http://i45.photobucket.com/albums/f9...GP2422-web.jpg

Here is a 100% crop from the one above:
http://i45.photobucket.com/albums/f9...P2422-crop.jpg

Here is one at 300 mm (it shows some chromatic aberration wich is common with this lense in high contrast areas):
http://i45.photobucket.com/albums/f9...GP2375-web.jpg

Another one at 300 mm:
http://i45.photobucket.com/albums/f9...GP2363-web.jpg

And a 100% crop:
http://i45.photobucket.com/albums/f9...P2363-crop.jpg
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Old Dec 29, 2006, 3:15 PM   #10
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I have the same Tamron lens also and I am very happy with it. It will hunt for focus in poor indoor lighting sometimes, but not to an extreme. One thing I have to keep reminding myself of is that in normal mode, you have to be quite a bit farther away to focus on a subject than with the kit len (18mm vs 70mm).
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