DA* 16-50 owners, question about your aperture blades when open

jotarou1 · 06-25-2014, 11:43 AM

Question answered.

Last edited by jotarou1; 07-02-2014 at 10:20 AM. Reason: Question answered

PePe · 06-25-2014, 12:04 PM

Had to check with my lens. I have never paid attention to this so far!
The blades do not disappear completely. Looks very similar to yours.

Andi Lo · 06-25-2014, 12:07 PM

I dont own the 16-50 but on some zoom lenses the aperture blade actually look more closed / open when zoomed on certain focal lengths

LFLee · 06-25-2014, 12:08 PM

wow! I don't remember my DA*16-50 aperture can open this big!

hold on to that.... u might have make it a DA*16-50 f1.4 lens (jk) ..... take a pic and see?

**grahame** · 06-25-2014, 12:09 PM

That is common for constant aperture zooms. The DA 16-50 lens could be 1.8 or 2.2 at wide end, and lens maker had to stop the aperture from complete wide open at wide-end. zoom to long end, aperture will be wide open (disappear).

Andi Lo · 06-25-2014, 12:42 PM

Originally posted by grahame

That is common for constant aperture zooms. The DA 16-50 lens could be 1.8 or 2.2 at wide end, and lens maker had to stop the aperture from complete wide open at wide-end. zoom to long end, aperture will be wide open (disappear).

Wouldn't the lens sell better as a 16-50/1.8-2.8? Maybe the IQ suffers too much at those settings?

**grahame** · 06-25-2014, 12:50 PM

Originally posted by Andi Lo

Wouldn't the lens sell better as a 16-50/1.8-2.8?

I don't know. I guess it came from all manual film time, when photographer had to adjust exposure manually. With a constant aperture zoom, you can set exposure and zoom in and out without worrying about the exposure. I guess since then, a constant aperture became a symbol for "pro" class zoom. How many times have you heard people wish a zoom had constant F? For example, the new DA zoom?
I personally agree with you, that a maximum using of aperture (light) is better, unless the edges on wide end wide aperture is not acceptable. But I guess that is the market.

06-25-2014, 11:43 AM	#1
jotarou1 Junior Member Join Date: May 2009 Location: CA Posts: 39	Question answered Question answered. Last edited by jotarou1; 07-02-2014 at 10:20 AM. Reason: Question answered

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06-25-2014, 12:04 PM	#2
PePe Pentaxian Join Date: Nov 2007 Location: Helsinki, Finland Photos: Gallery \| Albums Posts: 597	Had to check with my lens. I have never paid attention to this so far! The blades do not disappear completely. Looks very similar to yours.

06-25-2014, 12:07 PM	#3
Andi Lo Veteran Member Join Date: Jul 2008 Location: Halifax, Nova Scotia Posts: 2,924	I dont own the 16-50 but on some zoom lenses the aperture blade actually look more closed / open when zoomed on certain focal lengths

06-25-2014, 12:08 PM	#4
LFLee Veteran Member Join Date: Aug 2009 Location: Southern California Photos: Gallery \| Albums Posts: 2,292	wow! I don't remember my DA16-50 aperture can open this big! hold on to that.... u might have make it a DA16-50 f1.4** lens (jk) ..... take a pic and see?

06-25-2014, 12:09 PM	#5
grahame Loyal Site Supporter Join Date: Aug 2011 Photos: Albums Posts: 2,041	That is common for constant aperture zooms. The DA 16-50 lens could be 1.8 or 2.2 at wide end, and lens maker had to stop the aperture from complete wide open at wide-end. zoom to long end, aperture will be wide open (disappear).

06-25-2014, 12:42 PM	#6
Andi Lo Veteran Member Join Date: Jul 2008 Location: Halifax, Nova Scotia Posts: 2,924	Originally posted by grahame That is common for constant aperture zooms. The DA 16-50 lens could be 1.8 or 2.2 at wide end, and lens maker had to stop the aperture from complete wide open at wide-end. zoom to long end, aperture will be wide open (disappear). Wouldn't the lens sell better as a 16-50/1.8-2.8? Maybe the IQ suffers too much at those settings?

06-25-2014, 12:50 PM	#7
grahame Loyal Site Supporter Join Date: Aug 2011 Photos: Albums Posts: 2,041	Originally posted by Andi Lo Wouldn't the lens sell better as a 16-50/1.8-2.8? I don't know. I guess it came from all manual film time, when photographer had to adjust exposure manually. With a constant aperture zoom, you can set exposure and zoom in and out without worrying about the exposure. I guess since then, a constant aperture became a symbol for "pro" class zoom. How many times have you heard people wish a zoom had constant F? For example, the new DA zoom? I personally agree with you, that a maximum using of aperture (light) is better, unless the edges on wide end wide aperture is not acceptable. But I guess that is the market.

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