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01-30-2008, 10:20 PM   #1
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DA* 16-50mm zoom action??

The UPS guy dropped off my new DA* 16-50 this evening. I have not had a chance to try out the lens beyond a few test shots in the house. It seems sharp and to focus correctly. I'll get a better feel for it outside tomorrow.

But the zoom action is not as smooth as I was expecting. Going down from 50 to 16mm the resistance is fairly consistent. But moving from 16-50 there is a bit of a stick /hesitation at 28mm and resistance on the zoom ring increases by about 1/3 effort from there to 50mm. The 28mm point is where the second of the double tubes starts to extend.

To other owners of this lens... is this normal? The zoom action on my kit lens and DA 50-200 is smoother and honestly I expected more polish from this lens, but then I've never owned a lens with a double tube extension before; do they all do thi8s?

Thanks
/Roger

01-30-2008, 11:06 PM   #2
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Hope someone who owns this lens answers soon, so you can take any action needed in time!

All zoom lenses I own are fairly smooth across the range, differences are mostly due to "creep". If it's really noticeable there is a good chance something is out of place/bent.

I had a stupid clerk at City Link drop a condenser microphone from 1 meter high, just so he could free his hands to type. Thankfully it works perfectly, but before I had the chance to test it I contacted the store and explained the situation - they assured me I'd get a replacement if it had been damaged.

Good luck!
01-30-2008, 11:17 PM   #3
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The zoom should focus really fast silently. In low light, it might be slowed down. Under a overcast sky, it should be almost intant as well. I managed to do a bit of street candid using 30-50mm focal range of this zoom and they turned out well. (In melbourne dark alleys)
01-30-2008, 11:18 PM   #4
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Sounds about the same as mine, remember these lenses are weather sealed, so they'll be stiffer than a cheap lens like the 50-200.

01-31-2008, 12:41 AM   #5
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I just got my 16-50MM and I noticed the same thing right away. I think I'll get over it as long as it makes good pics.
01-31-2008, 07:26 AM   #6
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QuoteOriginally posted by andyhewitt3 Quote
I just got my 16-50MM and I noticed the same thing right away. I think I'll get over it as long as it makes good pics.
I for one certainly would not mind a little quirkiness with the zoom resistance as long as the optics were excellent. Of course, I would prefer and expect the top of the line Pentax * lenses to have smooth zoom operation (but that's just me demanding way too much of these premium lenses).
01-31-2008, 08:21 AM   #7
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I don't pay attention to where the resistance increases, but if I was to guess, it's probably between 24mm and 31mm - same as you describe. I believe it's because (and I'll check this when I get home) of the middle tube starts to move more actively as you pass that range.
01-31-2008, 08:29 AM   #8
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I wouldn't worry -- most zooms don't have constant resistance across the range.

01-31-2008, 10:16 AM   #9
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I don't own this lens, but have a couple of other pentax zooms. The question I have is the following.

On the zooms I own, 28-80 and 28-105 FA Power Zooms, and 28-35 FAJ, the optical arrangement has the front element move out at both extremes of the zoom range but the lens is physically the shortest in the middle of the zoom range.

If the 16-50 is similar, And I seem to think I saw a question about this in the past, then at the transition point, when the front element is the furthest back in the lens barrel, there will be a drop in resistance.

I suspect it is simply the action needed on the cams to get the zoom through the range.

Note my Tamron 28-75 does not go through this transition, but simply gets longer as you zoom in.
01-31-2008, 05:01 PM   #10
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QuoteOriginally posted by Andrew Faires Quote
I don't pay attention to where the resistance increases, but if I was to guess, it's probably between 24mm and 31mm - same as you describe. I believe it's because (and I'll check this when I get home) of the middle tube starts to move more actively as you pass that range.
Yes, this is normal behaviour, the extra resistant comes when the second extender barrel starts to move around 24mm, nothing to worry about.
02-01-2008, 09:23 AM   #11
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Original Poster
Thanks for the all the replies. I thought the zoom resistance might be normal and after playing with the lens for a couple of days it's easy to get used to. I've not had time to test it properly, and am looking forward to getting out with it over the weekend. I can't say for 100% yet certainty, but it looks like I got a good one.
02-01-2008, 09:49 PM   #12
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my 50-135 is the same way
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