chris_zeel
Joined: 21 Jan 2013
Posts: 136
Location: Amsterdam, Netherlands
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 Posted: Mon Jan 12, 2015 7:58 pm Post subject: Primotar 50/3.5 maximum aperture |
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chris_zeel wrote:
I have a question about the maximum aperture of my Meyer Primotar 50/3.5, M42 mount serial 1988794.
It has an aperture pin and switch for manual and auto mode.
With the aperture set at f/3.5, in either manual mode and auto mode with the aperture pin pressed, in the aperture blades slightly close.
When the aperture is set to f/4 the blades don't really close further.
Is this normal?
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DSLR: Canon 6D, Canon 400D
SLR: Praktica MTL5, Topcon RE-2, Topcon RE Super, Nikon EM, Chinon CE-3 Memotron, Pentacon F, Zenit 12-XP
Rangefinder: Zorki 4K, Ricoh 500G, Olympus 35 SP, Neoca 2S
Folder: Afga Isolette-I
Compact: Olympus mju-I
AF: Tamron 28-75 f/2.8 XR Di LD
Exakta: Meyer-Optik Trioplan 50/2.9, Primagon 35/4.5
M42: Sigma Mini Wide 28/2.8, Auto Chinon 28/2.8, Meyer-Optik Lydith 30/3.5, Pentacon Electric 29/2.8, Mir 1b 37/2.8, Super-Takumar 50/1.4, Meyer-Optik Oreston 50 f/1.8, Auto Yashinon 50/2, CZJ Tessar T 50/2.8, E. Ludwig Meritar 50/2.9, Meyer-Optik Primotar E 50/3.5, Industar 50-2 50/3.5, SMC Takumar 55/2, CZJ Biotar 58/2, Helios 44 58 f/2, Jupiter-9 85 f/2, Meyer-Optik 85/3.5, Super-Takumar 105/2.8, Accura Super Tc 135/2.8, Pentacon Zebra 135/2.8, Jupiter-11 135 f/4, Chinon MC Auto 200/3.5, Accura Supertel Tc 200/4.5, Soligor C/D Macro+Zoom 80-200/4.5
F-mount: Nikon Series E 28/2.8, 50/1.8, 100/2.8, Nikkor-S 35/2.8, Nikkor-H.C 50/2, Nikkor-H 85/1.8
Topcon: RE Auto Topcor 35/2.8, RE. Auto Topcor 58/1.8, RE. Auto Topcor 135/3.5
OM: Zuiko Auto-S 50/1. |
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Attila
Joined: 24 Feb 2007
Posts: 57849
Location: Hungary
Expire: 2025-11-18
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| Posted: Mon Jan 12, 2015 9:43 pm Post subject: |
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Attila wrote:
half stop not move count as normal, especially on auto lenses, even a little dust on blades make it , never mind, if works anyway, enjoy.
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Items on sale on Ebay
Sony NEX-7 Carl Zeiss Planar 85mm f1.4, Minolta MD 35mm f1.8, Konica 135mm f2.5, Minolta MD 50mm f1.2, Minolta MD 250mm f5.6, Carl Zeiss Sonnar 180mm f2.8
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Oldhand
Joined: 01 Apr 2013
Posts: 6009
Location: Mid North Coast NSW - Australia
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| Posted: Tue Jan 13, 2015 4:04 am Post subject: |
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Oldhand wrote:
Yes, Attila is right - nothing to worry about.
I have the pre-set version and even though the max aperture is listed on the lens as f3.5, it does actually open a little wider than that.
Setting the aperture to f3.5 from the wide open position closed it just a little...... and only a little more for f4
The difference between the two is very slight.
Even wide open it is still quite a good lens
OH
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