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04-22-2009, 02:08 PM   #1
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18-250 zoom

i read on photozone that this lens has a very slow autofocus speed
i know it is considered a slow lens because of it widest aperature setting
can any users out there, either with the Pentax or Tamron tell me if in fact it does suffer from a slow autofocus speed, i really like this lens for outdoor use only

Dave

04-22-2009, 02:10 PM   #2
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It's a little slower than the kit lenses for e.g. but not much slower.
04-22-2009, 02:17 PM   #3
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I've used this lens all over the place, and slow autofocus is not how I'd ever describe it.

It hunts a little bit in low light, but honestly you shouldn't be using it there. For outdoors, it makes a fantastic, versatile lens, and you shouldn't need anything else for most of your shooting. It might be a hair slower than the DA40 or FA35, but those are some of the fastest focusers in the Pentax lineup. If the kit lens is fast enough for you, you'll be happy with this one.
04-22-2009, 02:23 PM   #4
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QuoteOriginally posted by Alfisti Quote
It's a little slower than the kit lenses for e.g. but not much slower.
thanks
i took a look at your examples in pbase, and if that is what this lens is capable of doing, i have been missing out.
thanks again

Dave

04-22-2009, 02:24 PM   #5
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QuoteOriginally posted by Eigengrau Quote
I've used this lens all over the place, and slow autofocus is not how I'd ever describe it.

It hunts a little bit in low light, but honestly you shouldn't be using it there. For outdoors, it makes a fantastic, versatile lens, and you shouldn't need anything else for most of your shooting. It might be a hair slower than the DA40 or FA35, but those are some of the fastest focusers in the Pentax lineup. If the kit lens is fast enough for you, you'll be happy with this one.
thanks
i plan to keep the 16-50 for low light

Dave
04-22-2009, 02:34 PM   #6
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You have the DA* 16-50mm and 50-135mm, why on earth would you want an 18-250?
04-22-2009, 03:11 PM   #7
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QuoteOriginally posted by Cosmo Quote
You have the DA* 16-50mm and 50-135mm, why on earth would you want an 18-250?
For occasions when you don't want to or can't carry both.
There are times I regret letting my 18-250 go as it is one hell of a good daylight lens for those quick family outings, etc.
04-22-2009, 03:39 PM   #8
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Also if you know how to work with it's limitations you should note that it can make a hell of a nighttime lens as well:



04-22-2009, 04:20 PM   #9
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QuoteOriginally posted by Cosmo Quote
You have the DA* 16-50mm and 50-135mm, why on earth would you want an 18-250?
I have a Sigma 18-50 F/2.8 and a Tamron 18-250mm.

My next zoom lens is likely a Pentax 50-135mm f/2.8, or a Sigma 50-150mm f/2.8.

The Tamron 18-250mm is excellent if you don't want to or can't carry more than one lens.
04-22-2009, 06:21 PM   #10
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I personally find the 18-250 focus about the same as the kit lens. So I have no problem using it at all under broad daylight.
04-22-2009, 06:41 PM   #11
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QuoteOriginally posted by Cosmo Quote
You have the DA* 16-50mm and 50-135mm, why on earth would you want an 18-250?
The DA*16-50 alone is bigger and heavier than the 18-250. The 18-250 is a nice all-in-one when you want to transform your DSLR in a good superzoom P&S. But personally I took the other road: I sold my 18-250 and bought a DA* 16-50. Not looking back.
04-22-2009, 08:35 PM   #12
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QuoteOriginally posted by Cosmo Quote
You have the DA* 16-50mm and 50-135mm, why on earth would you want an 18-250?
too many times and i mean too many times ,
i see an expression i want, but have on the wrong lens and by the time i switch, the shot i wanted is long gone...............
i have went over this lens so many times, read so many reviews, about what to expect, and up to now,
i have only heard good things about it in daylight
plan to keep the 16-50, for when lighting gets low, at low light levels, my pics are usually under the 50mm end anyway.
i know IQ is compramised, in such a zoom, but would I miss this difference in image Quality, i dont shoot pics for a living, dont think i will ever make it into national geographic,
i just love getting those candid moments, that only a photograph will remind you of later on in life, as you grow old and cant remember what in the hell you did yesterday.
i am willing to give up some image quality, but with Pentax one cannot afford to give up autofocus speed, which gave me great concern, as photozone mentioned it has a slow autofocus speed, and i am hoping that they ment it is a slow lens because of its aperature range

Dave
04-23-2009, 07:00 AM   #13
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If you are travelling it is very, very hard to argue with. Frankly I wish we had a REALLY STRONG 16-85 like Nikon, I don't really need the extra reach out to 250 but 50mm is too short.

I travel with this, the 12-24 and the 77 and everything is covered.
04-23-2009, 07:27 AM   #14
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Just got mine from the post office. Focus is not slow, it's not as fast as others but it's not slow. I think it's the same has kit lens.


Last edited by netuser; 04-23-2009 at 09:12 AM.
04-23-2009, 08:19 AM   #15
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I have the pentax 18-250 and the sigma 28-200. i honestly regret buying the 18-250 as the 28-200 is a lot sharper so i think i am going to return the 18-250 and buy the sigma 10-20mm, I have started another thread about it
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