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Torphoto · 04-26-2009, 11:34 AM

the 16-50 is double barrelled and has no sealing issues, it's just got other issues

RaduA · 04-26-2009, 03:40 PM

Originally posted by Torphoto

the 16-50 is double barrelled and has no sealing issues, it's just got other issues

No, 16-50 is TRIPLE barreled!

Radu

creampuff · 04-26-2009, 05:25 PM

Good that it is NOT an internal zoom design given that many internal zoom lenses are only at their claimed focal length at infinity.

creampuff · 04-26-2009, 05:27 PM

Originally posted by choubacca

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*...

soccerjoe5 · 04-26-2009, 07:35 PM

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

kristoffon · 04-26-2009, 07:44 PM

Originally posted by creampuff

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?

Jonson PL · 04-26-2009, 09:14 PM

Very impressive, thanks for the samples

**Digitalis** · 04-26-2009, 10:35 PM

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.

jsherman999 · 04-27-2009, 08:17 AM

Originally posted by Digitalis

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.

.

**Digitalis** · 04-27-2009, 09:15 AM

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...

ogl · 04-28-2009, 06:23 AM

Originally posted by Digitalis

the Image quality seems favourably comparable to the

DA*60-250/4 covers FF.

FengyBoy · 04-29-2009, 11:12 AM

Here are more pictures.

tim71 · 05-04-2009, 10:12 AM

Originally posted by arpaagent

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...

Fl_Gulfer · 05-04-2009, 08:45 PM

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.

arpaagent · 05-04-2009, 10:34 PM

Originally posted by tim71

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

04-27-2009, 09:15 AM	#70
Digitalis Site Supporter Join Date: Mar 2009 Location: Melbourne, Victoria Photos: Gallery Posts: 11,694	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.

05-04-2009, 10:12 AM	#73
tim71 Junior Member Join Date: Feb 2009 Photos: Gallery Posts: 38	Originally posted by arpaagent 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.

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04-26-2009, 11:34 AM	#61
Torphoto Veteran Member Join Date: Mar 2008 Location: Trinidad W.I. Photos: Gallery Posts: 612	the 16-50 is double barrelled and has no sealing issues, it's just got other issues

04-26-2009, 03:40 PM	#62
RaduA Guest	Originally posted by Torphoto 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
creampuff Veteran Member Join Date: May 2007 Location: Singapore Photos: Gallery Posts: 3,953	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
creampuff Veteran Member Join Date: May 2007 Location: Singapore Photos: Gallery Posts: 3,953	Originally posted by choubacca 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
soccerjoe5 Veteran Member Join Date: May 2008 Location: Philippines Photos: Gallery Posts: 1,343	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
kristoffon Veteran Member Join Date: Aug 2008 Location: Brazil Posts: 532	Originally posted by creampuff 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
Jonson PL Veteran Member Join Date: Dec 2006 Location: Copenhagen Photos: Gallery Posts: 1,842	Very impressive, thanks for the samples

04-26-2009, 10:35 PM	#68
Digitalis Site Supporter Join Date: Mar 2009 Location: Melbourne, Victoria Photos: Gallery Posts: 11,694	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
jsherman999 Veteran Member Join Date: Dec 2007 Photos: Gallery Posts: 8,237	Originally posted by Digitalis 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. .

04-28-2009, 06:23 AM	#71
ogl Banned Join Date: Dec 2007 Location: Sankt Peterburg Photos: Gallery \| Albums Posts: 8,382	Originally posted by Digitalis the Image quality seems favourably comparable to the DA*60-250/4 covers FF.

04-29-2009, 11:12 AM	#72
FengyBoy Forum Member Join Date: Apr 2009 Location: Nottingham, UK Posts: 58	Here are more pictures.

05-04-2009, 08:45 PM	#74
Fl_Gulfer Veteran Member Join Date: Jul 2007 Location: Florida Gulfer Photos: Albums Posts: 3,054	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
arpaagent Veteran Member Join Date: Sep 2008 Location: Raleigh, NC Photos: Gallery Posts: 803	Originally posted by tim71 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

First photo samples from DA* 60-250!

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