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08-31-2018, 08:25 AM   #1
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Revuenon 50/1.4 vs Pentax-A 50/1.4

Hi there!
I hope this is right place to write about my issue.

I have Auto Revuenon 50/1.4 (6 blades version), which I got for "free" with Pentax MX. Today I found SMC Pentax-A 50/1.4 for about 135 USD. I honestly don't know if it's worth to buy it. Does anyone know/have both lenses and can share any tests? Can those 2 blades significantly improve bokeh? Are Pentax's IQ, sharpness and contrast better that lens I own?

I can't rely on lensreview site, because Pentax has 45 reviews and Revuenon has only 17, and it's 8 blades version, not 6 :/

Have a nice day!

08-31-2018, 08:38 AM   #2
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The A50/1.4 is a very nice lens. I don't have any experience with the Revuenon. However, $135USD
is on the high side for the A50/1.4 unless it is really pristine.
08-31-2018, 09:02 AM   #3
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QuoteOriginally posted by tvdtvdtvd Quote
The A50/1.4 is a very nice lens. I don't have any experience with the Revuenon. However, $135USD
is on the high side for the A50/1.4 unless it is really pristine.
I've thought this price is quite low for this lens, as I can see M versions for ~120 USD
08-31-2018, 09:18 AM   #4
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QuoteOriginally posted by sezbensu Quote
Can those 2 blades significantly improve bokeh? Are Pentax's IQ, sharpness and contrast better that lens I own?
I'd never used the Revenuenon 50mm f1.4.

But once I have a Takumar 50mm f1.4 8 elements with 6 blades and compared vs the Pentax-A 50mm f1.4 with 8 blades: Wide open the diff was negligible. I sell the Takumar and keep the A cos' I need the convenience of control the aperture from the camera's dial as I use the 50mm for street photos

Every "Nifty Fifty" has it own soul. I have several in the past: f2.0, f1.7, f1.4, f1.2. Now I only keep the A50mm f1.4 for every day use and the f1.2 for lowlight/bokeh.

Imho: If you already have a f1.4 use it for lowlight/bokeh and better go for the cheap f2.0 or f1.7 for sharpness.

P.S: Forgot to mention that I found hard to focus with A 50mm f1.4. The Pentax-A 50mm f1.7 and f2.0 was easy cake to focus.


Last edited by carabez; 08-31-2018 at 09:24 AM. Reason: PS
08-31-2018, 09:33 AM   #5
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QuoteOriginally posted by carabez Quote
Imho: If you already have a f1.4 use it for lowlight/bokeh and better go for the cheap f2.0 or f1.7 for sharpness.
I have A 50/1.7 and I use it everyday. It's great: small and sharp.

QuoteOriginally posted by carabez Quote
P.S: Forgot to mention that I found hard to focus with A 50mm f1.4. The Pentax-A 50mm f1.7 and f2.0 was easy cake to focus.
What do you mean? Hard to focus because of the ring or because it's f1.4?
08-31-2018, 01:01 PM   #6
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QuoteOriginally posted by sezbensu Quote
Can those 2 blades significantly improve bokeh?
The bokeh will be different. Whether you like the Pentax-A 50/1.4 better is another question entirely.


Steve
08-31-2018, 01:09 PM   #7
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QuoteOriginally posted by sezbensu Quote
What do you mean? Hard to focus because of the ring or because it's f1.4?
Because the f1.4 DOF is narrow + poor ligth environment is hard to tell when the subject is focused, in that scenario I use the live preview focus peaking. If you have a split focus screen that's no a problem.

08-31-2018, 02:18 PM   #8
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Hi,

The A 50mm F/1.4 have a better bokeh than the F/1.7 version.
Why an A 50mm, and not the FA 50mm F/1.4 ?
You can find a cheap on on Ebay.
08-31-2018, 02:44 PM   #9
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I'm not a fan of the A 50 1.4, it sees very little use from me. Rendering is flat, contrast is low, it's no competition even to my Petri 50 1.7.

I think 50 1.7s in general are just "better" from the time period. More usable and more fun.
08-31-2018, 03:04 PM - 2 Likes   #10
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those old lenses are tricky. I have the maimiya 55 1.4 which is supposed to be the tomioka design same as the chinon and sears and so on but its not that simple. Anyways I do not have the 50 1.4. I do have the pentax A 50 1.4. I prefer the pentax. The older 55 lenses tend to do better than the 50s in ratings so I would hazard a guess I would like the Pentax A much more. At 1.4 its much less glowy. They both have solid constuction. I also have the pentax a 50 1.7. Nice but plastic contruction. Since I am either full open or stopped down I really don't use the 1.7. Construction and 1.4 makes me use the 1.4.
This is the pentax a 1.4 at 1.4.
08-31-2018, 03:41 PM   #11
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QuoteOriginally posted by stevebrot Quote
The bokeh will be different. Whether you like the Pentax-A 50/1.4 better is another question entirely.
Well, the conclusion is I have to collect all 50s to compare on my own

QuoteOriginally posted by carabez Quote
Because the f1.4 DOF is narrow + poor ligth environment is hard to tell when the subject is focused, in that scenario I use the live preview focus peaking. If you have a split focus screen that's no a problem.
In that case, that's not an issue It's okay to focus with my Me super and Mx. It's even not that hard with K-50, and just like you said - there's always LV with focus peaking

QuoteOriginally posted by Le Fanfoué Quote
The A 50mm F/1.4 have a better bokeh than the F/1.7 version.
Why an A 50mm, and not the FA 50mm F/1.4 ?
You can find a cheap on on Ebay.
I didn't think about FA version, as I usually don't use AF. What's more, I used to buy lenses at my 'domestic' market, as it's usually cheaper (shipping is expensive sometimes). But in that case - you're right, FA version costs ~70 USD more (shipping included) than the A version I found. But still, it's a bit over my budget for now. I guess I will buy it later. As far as I know - it's the same construction as older lenses (A, M, F)? If yes, I would skip A version to buy FA.

QuoteOriginally posted by ZombieArmy Quote
I'm not a fan of the A 50 1.4, it sees very little use from me. Rendering is flat, contrast is low, it's no competition even to my Petri 50 1.7.

I think 50 1.7s in general are just "better" from the time period. More usable and more fun.
It always bothers me if f/1.7 is better wide open than f/1.4 at f/1.7 (or f/1.8, whatever) in terms of IQ and sharpness. After all, we change aperture.

QuoteOriginally posted by swanlefitte Quote
those old lenses are tricky.
Almost all of my lesnes are old. I've even got M42 Zeiss lens and it's wonderful!

QuoteOriginally posted by swanlefitte Quote
The older 55 lenses tend to do better than the 50s in ratings so I would hazard a guess I would like the Pentax A much more. At 1.4 its much less glowy. They both have solid constuction.
I've been thinking about Takumar 55/1.sth or 50s. For now, I didn't read much about whole Takumar series (I only know that their focusing rings are amazing), not to mention about other 55s

QuoteOriginally posted by swanlefitte Quote
I also have the pentax a 50 1.7. Nice but plastic contruction. Since I am either full open or stopped down I really don't use the 1.7. Construction and 1.4 makes me use the 1.4.
This plastic is an advantage when you don't have too much space in your bag and you're out. It's amazing to have light and small lens (my friend who uses Nikon, when first saw my 50/1.7 told me 'that's nice pancake!'). I use f/1.7 and I know it's sharp enough for me wide open, but sometimes I need this extra stop, that's why I am looking for 'better' f/1.4 that I have, especially that this Revuenon was part of my camera and it was 'free'. Big thanks for photo sample though! I will find some flower and reproduce your shot with my 1.4 to compare. It may seem that I don't need Pentax lens and that IQ and sharpness offered by my lens is enough so far.
08-31-2018, 04:28 PM - 1 Like   #12
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QuoteOriginally posted by sezbensu Quote
It may seem that I don't need Pentax lens and that IQ and sharpness offered by my lens is enough so far.
I'd sold quite some my less used lens collection to get the 55mm f1.2, the 6x7 75mm f4.5 and the 6x7 105mm f2.4 so far no regrets.

Last edited by carabez; 08-31-2018 at 04:38 PM. Reason: grammer ;)
09-01-2018, 01:29 PM   #13
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QuoteOriginally posted by carabez Quote
I'd sold quite some my less used lens collection to get the 55mm f1.2, the 6x7 75mm f4.5 and the 6x7 105mm f2.4 so far no regrets.
And you're talking about Takumar, am I right?
09-01-2018, 01:40 PM - 3 Likes   #14
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QuoteOriginally posted by ZombieArmy Quote
I'm not a fan of the A 50 1.4, it sees very little use from me. Rendering is flat, contrast is low, it's no competition even to my Petri 50 1.7.

I think 50 1.7s in general are just "better" from the time period. More usable and more fun.

... I don't know, my A50/1.4 is pretty sweet at full aperture:





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