visualopsins
Joined: 05 Mar 2009
Posts: 11028
Location: California
Expire: 2025-04-11
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 Posted: Sat Jul 23, 2011 5:21 pm Post subject: Starfield Compare M42 Asahi SMC Takumar 1.4/50 and 1.8/55 |
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visualopsins wrote:
5Dc iso 1600, lenses wide open for 16 seconds. Note: 5Dc mirror does not hit M42 SMC 1.4/50 at infinity, but does hit S-M-C 1.4/50!
100% crops (actual pixels), first 50mm then 55mm.
Center (one with satellite flare  ):
Top (optical formula difference seen here in coma shape):
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Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX-A ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (151B), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
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s58y
Joined: 05 Sep 2010
Posts: 131
Location: Eastern NY
Expire: 2013-09-10
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| Posted: Sat Jul 23, 2011 10:42 pm Post subject: |
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s58y wrote:
Interesting test, especially with the full-frame sensor.
Usually, for astroimaging, wider angle lenses like this need to be stopped down to f/2.8, or even f/4. My usual goal is to find lenses that are good for astro at f/2.8. It would be great to find one that would work at f/2 -- probably something like an 85mm lens, though.
Someday I'll get around to astro-testing out the 50's I have. I'll do tests on a clear night with a bright moon, so as not to waste a good imaging night.
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