[Optic_Junkie]

Hi Klaus



In your review of the Pentax DA-L 35mm f2.4 under the 'Bokeh' section, you wrote: "The Pentax lens does a rather average job here which is typical for lenses with aspherical elements. Out-of-focus highlights can show an outlining effect and aperture shape gets already visible at f/3.2 - the latter aspect is an effect of the non-circular aperture blades."



Can you clarify as to whether the lens has straight aperture blades, or curved aperture blades (as found in the DA*55 and D-FA 100)? I'm assuming "non-circular aperture blades" was a typo, and you instead meant to refer to "curved aperture blades" and/or a "circular aperture". Thanks

[Klaus]

[quote name='Optic_Junkie' timestamp='1322618169' post='13367']

Hi Klaus



In your review of the Pentax DA-L 35mm f2.4 under the 'Bokeh' section, you wrote: "The Pentax lens does a rather average job here which is typical for lenses with aspherical elements. Out-of-focus highlights can show an outlining effect and aperture shape gets already visible at f/3.2 - the latter aspect is an effect of the non-circular aperture blades."



Can you clarify as to whether the lens has straight aperture blades, or curved aperture blades (as found in the DA*55 and D-FA 100)? I'm assuming "non-circular aperture blades" was a typo, and you instead meant to refer to "curved aperture blades" and/or a "circular aperture". Thanks

[/quote]



non-circular aperture blades = straight blades

[Optic_Junkie]

Indeed - this would seem obvious to me as well. So, the Pentax DA-L 35mm f2.4 doesn't have curved aperture blades of any kind; it has straight blades. Is that correct?





[quote name='Klaus' timestamp='1322634989' post='13373']

non-circular aperture blades = straight blades

[/quote]

[Brightcolours]

[quote name='Optic_Junkie' timestamp='1322636922' post='13376']

Indeed - this would seem obvious to me as well. So, the Pentax DA-L 35mm f2.4 doesn't have curved aperture blades of any kind; it has straight blades. Is that correct?

[/quote]

As the sample image clearly shows, this particular lens has 6 aperture blades that not rounded at all. About as straight as the 5 aperture blades my 35mm f2 has when stopped down.



Not sure where you are going with this? <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/blink.gif' class='bbc_emoticon' alt=':blink:' /> If you want to point out that you can detect a slight curve in the blades when stopped down, don't. We call blades "curved" when they more or less produce rounded apertures, and this Pentax clearly does not do that.

[Optic_Junkie]

Well, I personally, am not going anywhere with it.



http://forums.dpreview.com/forums/read.asp?forum=1036&message=39951648





[quote name='Brightcolours' timestamp='1322641703' post='13380']

As the sample image clearly shows, this particular lens has 6 aperture blades that not rounded at all. About as straight as the 5 aperture blades my 35mm f2 has when stopped down.



Not sure where you are going with this? <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/blink.gif' class='bbc_emoticon' alt=':blink:' /> If you want to point out that you can detect a slight curve in the blades when stopped down, don't. We call blades "curved" when they more or less produce rounded apertures, and this Pentax clearly does not do that.

[/quote]

[mst]

[quote name='Optic_Junkie' timestamp='1322672091' post='13397']

http://forums.dpreview.com/forums/read.asp?forum=1036&message=39951648

[/quote]



Geez, what a waste of time...



-- Markus

[Optic_Junkie]

Agreed; it looks like the admin banned some people over there after the guy starting calling Klaus a liar. DPR is full of morons.





[quote name='mst' timestamp='1322682282' post='13405']

Geez, what a waste of time...



-- Markus

[/quote]