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07-31-2011, 06:35 AM   #1
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Takumar/Pentax 50mm 1.4 versions

Hello,
I'm planning to buy the 50mm 1.4 lens MF. I'm just not sure which version to buy, is there a link that shows all the differences between the versions (and most importantly how many there are out there) ?
I'm looking for the one that has 8 blades, it's multi coated, it's not radioactive and doesn't have the yellowing problem

Thank you


Last edited by -sandro-; 07-31-2011 at 06:54 AM.
07-31-2011, 08:22 AM   #2
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Well, you may be looking for a K mount 50/1.4 lens instead. As far as I know, all Takumars except the 8 element one are radioactive, but that one has 6 aperture blades. You may not find a Takumar with your desired features, so look for a SMC Pentax (same optical formula, K mount) or M or A.
07-31-2011, 09:22 AM   #3
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Does the K mount one provide the same sharpness wide open and "dreamy" soft bokeh like the Takumar? If the optical formula is the same I shouldn't have problems I think
07-31-2011, 02:43 PM   #4
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Sharpness wide open? It depends upon how well you can focus (and it can be hard). But except for the yellow tint, which I like, I for one cannot discern between any 50/1.4 or even 1.7, 1.8 or f2 lens. Maybe I can recognize an f/1.2 picture. And the only reason to choose Pentax over an off-brand may be the multicoating and the control of chromatic abberation. But if you have never dealt with manual focus before, and at such large apertures where it matters, you may be disappointed at first.

07-31-2011, 05:14 PM   #5
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well actually rather than sharpness it's CA that worries me more. Is it well controlled?
I own a NIkon 35mm f2 and wide open has that problem
08-01-2011, 05:32 AM   #6
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QuoteOriginally posted by -sandro- Quote
well actually rather than sharpness it's CA that worries me more. Is it well controlled?
I own a NIkon 35mm f2 and wide open has that problem
Take a look at the Pentax Lens Review Database. I don't think you will see CA listed as a problem for any of the M 50's or A 50's.

Pentax Reviews - Pentax Lens Reviews & Complete Lens Database

Tim
08-01-2011, 06:07 AM   #7
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thank you
08-01-2011, 11:38 AM   #8
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QuoteOriginally posted by kcobain1992 Quote
Well, you may be looking for a K mount 50/1.4 lens instead. As far as I know, all Takumars except the 8 element one are radioactive, but that one has 6 aperture blades. You may not find a Takumar with your desired features, so look for a SMC Pentax (same optical formula, K mount) or M or A.
Even if they are radioactive, it is Thorium and the alpha rays it emits cannot penetrate the human skin. Owning and handling small amounts of it in gas mantles and lens is safe. However, if you were to pulverize the glass and inhale the particles, that would be a different story.

08-01-2011, 11:45 AM   #9
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All the 50/1.4 from s-m-c up have 8-blades including the FA 50/1.4 and share the 7 element 6 group arrangement. The K 50/1.2 has 8 blades and the A 50/1.2 has 9.
08-01-2011, 12:05 PM   #10
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QuoteOriginally posted by Blue Quote
Even if they are radioactive, it is Thorium and the alpha rays it emits cannot penetrate the human skin. Owning and handling small amounts of it in gas mantles and lens is safe. However, if you were to pulverize the glass and inhale the particles, that would be a different story.
Hmmm, inhaling (or ingesting) ANY pulverized glass, thoriated or no, would be a different story, eh?

-sandro-, I think you might like the bokeh from 55/1.8 even more than 50/1.4. Both lenses have equal sharpness wide open at infinity as far as I can tell, from star field comparisons, but due to different optical formulas, have different bokeh rendering. I have not compared sharpness at closer focus distance. Others think, and I suspect it is true, that 50/1.4 is sharper at close distance, making the 50/1.4 better for portraits and 55/1.8 better for landscapes.
08-01-2011, 02:01 PM   #11
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QuoteOriginally posted by Blue Quote
Even if they are radioactive, it is Thorium and the alpha rays it emits cannot penetrate the human skin. Owning and handling small amounts of it in gas mantles and lens is safe. However, if you were to pulverize the glass and inhale the particles, that would be a different story.
Also, the yellowing is quite easy to deal with if you have a good UV light, I cleared one up in 3 days and it should be fine for many years to come.

I have a Super Takumar and an M, both are excellent, but I find myself using the Takumar the most.
08-01-2011, 02:02 PM   #12
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I need the extra light from 1.4 aperture, it'll be used mainly for video
08-01-2011, 04:55 PM   #13
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QuoteOriginally posted by -sandro- Quote
well actually rather than sharpness it's CA that worries me more.
Which type of CA worries you? The Takumars and the FA have LoCA - it's very obvious - I assume that every model between those shares this characteristic. PF is not problematic and I didn't see them produce any LaCA.
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