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04-26-2009, 11:34 AM   #61
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the 16-50 is double barrelled and has no sealing issues, it's just got other issues

04-26-2009, 03:40 PM   #62
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QuoteOriginally posted by Torphoto Quote
the 16-50 is double barrelled and has no sealing issues, it's just got other issues
No, 16-50 is TRIPLE barreled!

Radu
04-26-2009, 05:25 PM   #63
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Good that it is NOT an internal zoom design given that many internal zoom lenses are only at their claimed focal length at infinity.
04-26-2009, 05:27 PM   #64
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QuoteOriginally posted by choubacca Quote
Why not just the DA 55-300mm?
Perhaps because it is not a constant aperture zoom and it has a tendency to hunt when autofocusing. And it is not a DA*...

04-26-2009, 07:35 PM   #65
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The internal zoom shouldn't have an effect on the sealing as the 16-50. I've used the 16-50 in pouring rain and it handled it like a champ. The only thing I usually don't like is the zooming action. The zooming action of non-internal zoom lens is it's a bit stiffer and isn't as smooth as internal zoom lenses. Well, I hope this one is smooth
04-26-2009, 07:44 PM   #66
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QuoteOriginally posted by creampuff Quote
Good that it is NOT an internal zoom design given that many internal zoom lenses are only at their claimed focal length at infinity.
I think you mean internal focus, perhaps?
04-26-2009, 09:14 PM   #67
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Very impressive, thanks for the samples
04-26-2009, 10:35 PM   #68
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from the samples I have seen the bokeh on this lens seems to be very good. though I sense there will be a showdown between the sigma 100-300mm f/4 APO EX DG...I'll be watching that closely.

04-27-2009, 08:17 AM   #69
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QuoteOriginally posted by Digitalis Quote
from the samples I have seen the bokeh on this lens seems to be very good. though I sense there will be a showdown between the sigma 100-300mm f/4 APO EX DG...I'll be watching that closely.

This image alone tells me that it's going to be comparable in sharpness to the Sigma:





Yes, I can tell from that image, having shot 1000's of frames with the Sigma and seeing images that size cropped - it's going to equal the Sigma at most apertures, probably. Although the Siggy is exceptional wide-open.

I don't think it will beat the Sigma's AF speed, though, and hopefully it will be discounted soon to near or below Sigma 100-300 levels.


.
04-27-2009, 09:15 AM   #70
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what aperture was that pic taken at?...I'll hazard a guess...f/5.6?..the bokeh is Very good, no sign of aperture blades...which is the downfall of the sigma.

though the AF performance of the sigma is nothing to be sneezed at...

Last edited by Digitalis; 09-24-2009 at 01:48 AM.
04-28-2009, 06:23 AM   #71
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QuoteOriginally posted by Digitalis Quote
the Image quality seems favourably comparable to the
DA*60-250/4 covers FF.
04-29-2009, 11:12 AM   #72
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Here are more pictures.







05-04-2009, 10:12 AM   #73
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QuoteOriginally posted by arpaagent Quote
I wonder if this lack of internal zooming compromises the weathersealing of the lens any? Say you have it zoomed out to 250mm and it's raining outside. Then you need to zoom back to 50mm. It will be pulling all of those raindrops from the barrel towards the inside of the lens. Hopefully they have some serious and well-lubricated o-rings there to keep that water out in that situation.
There may be one other problem - just think about the "pump" action this big sealed barrel is causing when extending. It is obviously more tolerable with shorter zooms, but with this kind of dimensions the lens really acts like a huge piston - with seals.

P.S. These images are getting me to want this lens - having a DA* 50-135 and wanting more of this...

Last edited by tim71; 05-04-2009 at 03:25 PM.
05-04-2009, 08:45 PM   #74
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The DA* 50-135 is one of the best lenses Pentax has produced in the recent past. And the new DA* 60-250 is pretty dam close to it's IQ.
05-04-2009, 10:34 PM   #75
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QuoteOriginally posted by tim71 Quote
There may be one other problem - just think about the "pump" action this big sealed barrel is causing when extending. It is obviously more tolerable with shorter zooms, but with this kind of dimensions the lens really acts like a huge piston - with seals.

P.S. These images are getting me to want this lens - having a DA* 50-135 and wanting more of this...
This is what I was talking about. It seems to me that when you zoom, the volume of the lens inside would grow, and that can't just turn into a vacuum or you would never be able to zoom it due to vacuum suction. So the lens inevitably must suck in air from the outside...and what happens if it is a high humidity day? Then all of the sudden you are sucking in quite moist air...only to be trapped inside a sealed lens?

Curious. I don't doubt the weather seals of pentax but I would really love to know the details and any possible shortcomings that they have so that I could treat mine as necessary to keep them around as long as possible.

-Jim
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