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06-27-2009, 02:53 PM   #1
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pentax 18-250 question

Hi Everyone,

I've been looking to buy the pentax 18-250 lens, and finally found a store that carries it in my area. So I went there, and they only had one left (which happened to be the display one). As I played around with it in my hands and attached to my k20d, I noticed that the focusing ring, when moved, feels fairly rough. Almost as if it was grinding against something, or if there was some sand in between the rings (I doubt there really is any sand but that seemed like the best way to describe it).

I only have experience with the 18-55 and 50-200 lenses, which are very smooth... so I was hoping if anyone on this forum who uses this lens can tell me if it is normal or not. It is the only thing keeping me from buying it right now.

Thanks in advance!

06-27-2009, 03:20 PM   #2
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I have the Tamron 18-250 which is (as I understand it) the exact same thing as the Pentax 18-250 and actually the Pentax one is rebranded (again as I understand it). I just got mine back from Tamron for a minor repair to the rubber on the zoom ring. The focusing ring works just like you've described - like sand is in it. the Pentax 18-55 & 50-200 have the 'quick shift' focus rings which are indeed very smooth. Neither the Pentax or Tamron 18-250 have the 'quick shift ' system. I've considered that a major flaw however, I own it, like it, and use it.

I've also read that the Tamron is better than the Pentx but I'm not remembering why. You might want to research that fact but, fear not, the one in the store is functioning correctly.

On the other hand...I just received a Pentax DA 55-300 lens. More reach than either the Pentax or Tamron and...uses the quick shift system on the focus ring. My Tammy may be gathering dust soon. But...if you want a 'all in one' super zoom. The 18-250 range has it covered.

Oh...one more thing. The annoying thing about this lens is that lens creep is definitely an issue. Before I sent it back to Tamron, all I had to do was point the lens downward and it zoomed for me...ok, so that's why the lock switch is there. I requested that this be tightened by Tamron and WOW it came back nice and tight, lens lock not needed (for now). I'll have to see how this holds up but it's good to see that this can be adjusted.

Last edited by blackcloudbrew; 06-27-2009 at 03:26 PM.
06-27-2009, 03:39 PM   #3
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Yup - my Pentax version has the sandy feel too.

Jer
06-27-2009, 05:12 PM   #4
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I also own a Tamron 18 -250 and what you are hearing and feeling are the autofocus gears. If you look at the back of the lens and turn the focus ring you will see the screw drive spinning that is your noise everything is A-OK.

06-27-2009, 07:37 PM   #5
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I think that if you set the camera AF/MF switch to MF, then the hand (manual) focussing will be smooth - no gear grinding.
06-27-2009, 09:55 PM   #6
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My 10-17 has this sandy focus ring and people says it's normal. The 10-17 has quickshift though.
06-28-2009, 09:22 AM   #7
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great. thanks for your help everyone. I might go pick this up now.
06-28-2009, 05:02 PM   #8
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guys can i get your opinion on the shot i think it looks a bit soft in places ive just bought a pentax k20d it had a pentax 18-250 lens i used it yesday at a car show but im to to happy with the shots . im looking at a new lens today but just want opinions on this lens shots thanks


06-28-2009, 06:36 PM   #9
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QuoteOriginally posted by shane33 Quote
guys can i get your opinion on the shot i think it looks a bit soft in places ive just bought a pentax k20d it had a pentax 18-250 lens i used it yesday at a car show but im to to happy with the shots . im looking at a new lens today but just want opinions on this lens shots thanks
I love the photo. The extreme saturation works really well with the brightly coloured cars.

I see the softness, but I suspect it's because the focus isn't on the nearest car, where I expected it to be. Instead focus seems to be on the blue car, with insufficient depth of field to include the forefront car. I don't believe this is a lens issue, but a technique issue.

Last edited by audiobomber; 06-28-2009 at 07:37 PM.
06-29-2009, 12:40 PM   #10
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QuoteOriginally posted by shane33 Quote
guys can i get your opinion on the shot i think it looks a bit soft in places ive just bought a pentax k20d it had a pentax 18-250 lens i used it yesday at a car show but im to to happy with the shots . im looking at a new lens today but just want opinions on this lens shots thanks
That's a great shot. Be sure to stop down (f/8+ wide angle, f/11+ tele) to get sharp pictures.
06-29-2009, 07:40 PM   #11
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thanks guys i just bought a sigma 17-70 hoping it might suit car pics better also whats the best mode to shoot it as the shot above was just in green auto
06-29-2009, 07:57 PM   #12
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The best mode to shoot depends on what you want to shoot. I use Av mode for almost everything. You should learn exposure basics to decide what's best for you on a particular shoot. I recommend understanding exposure and Scott Kelby's digital photography book...
12-10-2009, 05:59 AM   #13
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As a beginner to this forum, I have a quick question on the Pentax 18-250mm lens.
Is the User Manual available online? For example as a PDF file ?
Thank you in advance for any hint.
12-10-2009, 07:25 AM   #14
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QuoteOriginally posted by hcc Quote
Is the User Manual available online?
Found the older Pentax manual here (the newest manual eliminates the 18-250 because it has been discontinued).

The equivalent Tamron version is available here.

Last edited by tomwil; 12-10-2009 at 08:00 AM. Reason: Found Pentax manual
12-10-2009, 01:57 PM   #15
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QuoteOriginally posted by tomwil Quote
Found the older Pentax manual here (the newest manual eliminates the 18-250 because it has been discontinued).

The equivalent Tamron version is available here.
Tomwil

Many thanks. Much helpful and appreciated.

======================
Pentax K-7 + Pentax DA 18-250mm
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