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What lenses with star-shaped aperture do You know
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FotoPete



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Joined: 20 Nov 2012
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PostPosted: Mon Feb 03, 2014 5:36 pm    Post subject: Reply with quote



Don't forget about the Helios 40! Laughing
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vanylapep



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PostPosted: Mon Feb 03, 2014 9:37 pm    Post subject: Reply with quote

Konica Hexanon 40mm f1.8

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Pontus



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PostPosted: Mon Feb 03, 2014 9:46 pm    Post subject: Reply with quote

Contax Zeiss S-Planar 60/2.8
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Arkku



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PostPosted: Mon Feb 03, 2014 10:45 pm    Post subject: Reply with quote

Volna-9 examples:



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thebbm



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PostPosted: Mon Feb 03, 2014 10:48 pm    Post subject: Reply with quote

Unfortunately for me Contax yashica carl zeiss distagon 35mm 1.4 and planar 85mm 1.4



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Rick1779



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PostPosted: Mon Feb 03, 2014 10:59 pm    Post subject: Reply with quote

Industar 62 L/D


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Davichin




Joined: 15 Jan 2014
Posts: 33
Location: Canary Islands


PostPosted: Mon Feb 03, 2014 11:06 pm    Post subject: Reply with quote

Great examples! More lenses to look for... Rolling Eyes I will start with the Volna...
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kuuan



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PostPosted: Tue Feb 04, 2014 5:09 am    Post subject: Reply with quote

Canon LTM f1.8/50mm ver.II,
8 blades, looks pretty much the same as those of the Bellows Takumar shown
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M42 Takumars: presets: f2/58mm ( rare Sonnar ) 320.- f3.5/135mm 60.- Auto Taks: f3.5/35mm 65.- f2/55mm 40.- Super Taks: f3.5/135mm 35.- S-M-C Taks: f3.5/28mm 80.- f2/35mm 150.-
other M42: Vivitar f3.5/17mm (*) 50.- Auto Yashinon f2/5cm 55.- Pentax K: Kiron f2.8/28mm 30.- AF lens Sigma f2.8-4.5 17-70mm incl. 72mm UV filter 170.-
Sony E mount AF Sony SEL f2.8/16mm 100.- Olympus OM: Olympus H-Zuiko f2.8/24mm 150.- Olympus Pen-F Zuikos: f2.8/25mm (**) 125.- f1.4/40mm 190.-
Rollei QBM: Voigtländer Color-Skoparex AR f2.8 28mm 70.- Nikon F: Nikkor-NC Auto f2.8/24mm 120.- Nikkor-S Auto f1.4/50mm 70.- Tamron Adaptall: f2.5/28mm 35.-
notes: Vivitar f3.5/17mm (*): defect on coating or beginning separation of second to rear element, slight blooming at wide aperture to no impact on IQ -- Pen-F 2.8/25mm (**): coating damage on rear lens, 'light bleeding' at high contrast against light, some blooming at wide aperture
camera Pentax AP, the 'Original Pentax 50.-, if bought in set with it's lens, the f2/58mm Takumar + 25.-, set with defective 2/58 for 120.-

photos of and by manual lenses on Ricoh GXR M, Sony NEX5N, Pentax K-x and*istDs:
http://www.flickr.com/photos/kuuan/collections/72157604973031858/
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Nordentro



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PostPosted: Tue Feb 04, 2014 9:32 am    Post subject: Reply with quote

Volna 9 again Wink


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thebbm



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PostPosted: Tue Feb 04, 2014 9:35 am    Post subject: Reply with quote

i always asked myself why they build lenses with only few blades like this ?? i think lens constructor can easly put one or two blades to avoid this "star-shaped" apertures.
Anyone know why please ?
thanks
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Basilisk



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PostPosted: Tue Feb 04, 2014 10:55 am    Post subject: Reply with quote

thebbm wrote:
i always asked myself why they build lenses with only few blades like this ?? i think lens constructor can easly put one or two blades to avoid this "star-shaped" apertures.
Anyone know why please ?
thanks


In an automatic lens, the blades have to close and open rapidly when the photo is taken, so out went the preset lenses with 16 blades to be replaced with mechanically simpler designs with 6 or so blades. Fewer blades means less friction and less danger of mechanical disfunction. More expensive lenses could be made with higher precision and testing, so could get away with more blades.
At least that is my understanding, which could be wrong.
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Davichin




Joined: 15 Jan 2014
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PostPosted: Wed Feb 05, 2014 8:24 am    Post subject: Reply with quote

Komura 135 3.5 also has a star shaped bokeh...
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ZoneV



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PostPosted: Wed Feb 05, 2014 9:02 am    Post subject: Reply with quote

kds315* wrote:
Does that get visible in the bokeh these lenses produce?
..


For sure!
The aperture form results in bokeh form. Sometimes is is softend, for example due to spherical aberration - so the form is no more visible. But in extra bokeh tests and many images with pronouced bokeh one can see the bokeh form.
With an inverse bullseye filter in the aperture position one gets very smooth bokeh - apodization filtering.

The bokeh result is the reason I don´t like the Zeiss Contax AE lenses that much, I think they all have at some f-stops the ninja stars formed aperture.
Zeiss MM lenses not.
The famous Tokina 90mm f/2.5 macro has ninja stars at several f-stops, the Vivitar 90/2.5 predecessor only at one f-stop when I remember correct - this is why I love my Vivitar.
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DSLR: Canon EOS 5D, EOS 350D with interchangable IR-Cut / IR-Pass filter / Grey filter
Lenses: Zeiss 50/1.4, 50/1.7, 85/1.4, 135/2.8 C/Y, M42, Converted Minolta Rokkor 35/1.8, 58/1.2, Converted Canon FD 50/1.4, 100/4, 300/2.8, Steinheil Quinar 135/2.8, ..
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Arkku



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PostPosted: Wed Feb 05, 2014 9:19 am    Post subject: Reply with quote

thebbm wrote:
i always asked myself why they build lenses with only few blades like this ?? i think lens constructor can easly put one or two blades to avoid this "star-shaped" apertures.
Anyone know why please ?
thanks


While I don't know the specific answer as to why they make a star-shaped aperture, I'd like to point out that, e.g., the Volna-9 has six blades, which is the same number as many other lenses (perhaps the most common number of blades in vintage auto-aperture lenses!) but most of them have those six blades arranged as to give hexagon rather than star shape…

So I might speculate that the star shape is actually deliberate, and in being a more complex shape than the more common hexagon, perhaps it is actually an attempt to make the bokeh look better with the same number of blades.
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thebbm



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PostPosted: Wed Feb 05, 2014 9:30 am    Post subject: Reply with quote

@Basilisk and @Arkku, thanks for the answer.

Maybe that this shape make a better bokey yes.

I just look at a contax 35mm 1.4 and 85mm 1.4 and both have in fact 8 blades but make the "star" shape so it's wanted.
Maybe this is because they're not much space inside the lens to put longer shape ?
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