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04-22-2021, 11:57 AM   #1
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two vintage 28mm but different

Hi guys,

I've recently bought to vintage lensen. Both are 28mm 3.5. But they are different i sizes.

One is named smc pentax 3.5/28mm

the other smc pentax-m 3.5/28mm

Any of you know the difference in these? It seems that the pentax-m (only taken a few pictures) gives better bokeh, more warmer colors and is not in the need of much light to perform well. The other is alos supersharp, but it seems a bit more demanding to get nice results. a bit colder in the colors and against the sun the flare is not so good (but this however needs to be tested more)

attached pictures of the lenses

Attached Images
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SM-G970F  Photo 
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SM-G970F  Photo 
04-22-2021, 12:04 PM   #2
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The bigger one (without letter "m"") is probably K-lens. SMC Pentax 28mm F3.5 Reviews - K Prime Lenses - Pentax Lens Reviews & Lens Database
04-22-2021, 12:05 PM - 1 Like   #3
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The first is from the K series and the second is from the M series...

Pentax K-Mount Lenses Explained: The differences between various Pentax lens series

SMC Pentax 28mm F3.5 Reviews - K Prime Lenses - Pentax Lens Reviews & Lens Database

SMC Pentax-M 28mm F3.5 Reviews - M Prime Lenses - Pentax Lens Reviews & Lens Database

The K is 8 elements in 7 groups, the M is 6 elements in 6 groups. The optical formula changed to make the lens smaller.
04-22-2021, 12:08 PM   #4
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The M in SMC-M stands for "miniature" owing to an era at Asahi Optical Co. (Pentax) when they undertook to make cameras and lenses more compact. All of the lens elements and formulas were redesigned as between SMC's and SMC-M's at the same focal lengths and speeds, making the lenses smaller. Rendering characteristics are thus necessarily different.

04-22-2021, 12:10 PM - 1 Like   #5
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The general perception is that the M-series lenses may have given up some optical quality in search of compactness, though that is not universal...

Lens coatings changed over the years, and itís likely the SMC lens has a different formulation than the SMC-M. That could account for some of the color differences.

Thereís also issues with sample variation, both when the lenses were made as well as in how they were treated in service... which often results in the majority of differences in otherwise similar lenses.

Both of these lenses are also in the lens database here:

SMC Pentax 28mm F3.5 Reviews - K Prime Lenses - Pentax Lens Reviews & Lens Database

And here:

SMC Pentax-M 28mm F3.5 Reviews - M Prime Lenses - Pentax Lens Reviews & Lens Database

-Eric
04-22-2021, 12:24 PM   #6
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Thanks for the reply.

Yeah I read the review for the lens without the m before i bought it. The other one I traded. Looking foreward to thest them a bit more.
04-22-2021, 12:35 PM - 1 Like   #7
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QuoteOriginally posted by babbustaman Quote
Thanks for the reply.

Yeah I read the review for the lens without the m before i bought it. The other one I traded. Looking foreward to thest them a bit more.
The K 28mm 3.5 is widely acknowledged as the 2nd best 28mm of its era. It is sharp and produces great pictures.
04-22-2021, 01:40 PM - 1 Like   #8
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QuoteOriginally posted by pschlute Quote
The K 28mm 3.5 is widely acknowledged as the 2nd best 28mm of its era. It is sharp and produces great pictures.
I have had the K 28mm 3.5 for about 6 months. Its an amazing lens, the colors and contrasts are great, sharpness really great. Reviews here place it much better than the M. Am using it on my KP. For the price/quality, could not be happier. The one I understand that is supposed to be "the best" per reviews, is the same K series only the f2.0, think they call it the "Hollywood". This sells for probably a factor of 6-8x the price of the 3.5. Just recently having started doing more with these older lenses, I can say that this lens is very easy to focus. The metering and the "green" button use takes some time to get used to and adjust. I do always use a hood and find that setting the right metering takes a bit of work but my results now are really nice. Something about the K series that is just special. Hope you enjoy it!

04-22-2021, 02:15 PM - 1 Like   #9
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You'll find that the K version gets great praises from the users. I have the M myself and I love it, but it's no K.
04-22-2021, 08:35 PM - 1 Like   #10
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QuoteOriginally posted by babbustaman Quote
Hi guys,

I've recently bought to vintage lensen. Both are 28mm 3.5. But they are different i sizes.

One is named smc pentax 3.5/28mm

the other smc pentax-m 3.5/28mm

Any of you know the difference in these? It seems that the pentax-m (only taken a few pictures) gives better bokeh, more warmer colors and is not in the need of much light to perform well. The other is alos supersharp, but it seems a bit more demanding to get nice results. a bit colder in the colors and against the sun the flare is not so good (but this however needs to be tested more)

attached pictures of the lenses

The other is useless junk, I'd buy it from you for $100.




Its the K28/3.5, and its probably the best landscape legacy 28mm for the price (across any brand) - on FF
I find it un-inspired for any other type of shooting that I do though (eg. children, shallow DOF, candids )


K28/3.5







The M28/3.5 is nice and handy, but looses out in end sharpness by a large margin (and more vignetting); again within the FF context.
04-22-2021, 09:33 PM - 1 Like   #11
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I had the K version and it was amazing. It was sharp and didn't have barrel distortion.
04-23-2021, 12:22 AM   #12
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QuoteOriginally posted by pinholecam Quote
The other is useless junk, I'd buy it from you for $100.




Its the K28/3.5, and its probably the best landscape legacy 28mm for the price (across any brand) - on FF
I find it un-inspired for any other type of shooting that I do though (eg. children, shallow DOF, candids )


K28/3.5







The M28/3.5 is nice and handy, but looses out in end sharpness by a large margin (and more vignetting); again within the FF context.
Awsome sharpness in those pictures man! I thin I will stick to both. I have a feeling both are good in different scenarios.
04-23-2021, 02:15 AM - 1 Like   #13
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QuoteOriginally posted by babbustaman Quote
Awsome sharpness in those pictures man! I thin I will stick to both. I have a feeling both are good in different scenarios.
My preference for an all rounder over the M28/3.5 is the K24/2.8.
Somehow better for an all rounder imho.
Better subject separation, very center sharp at f3.5-4.
Faster.
Wider FOV that is really as wide as one need for most natural landscapes.
Also I find that 24mm is the max that can benefit from hyperfocal focusing w/o a need to resort to focus stacking.


K28/3.5 is one of my go to cityscape/landscape lenses, I certainly won't part with mine.


With the K24/2.8










No harm keeping the M28/3.5 since its so cheap.
Just that if I was to keep only one 28mm, then it will be the K28/3.5 and K24/2.8 (as the other lens )
04-23-2021, 03:54 AM   #14
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QuoteOriginally posted by pinholecam Quote
My preference for an all rounder over the M28/3.5 is the K24/2.8.
Somehow better for an all rounder imho.
Better subject separation, very center sharp at f3.5-4.
Faster.
Wider FOV that is really as wide as one need for most natural landscapes.
Also I find that 24mm is the max that can benefit from hyperfocal focusing w/o a need to resort to focus stacking.


K28/3.5 is one of my go to cityscape/landscape lenses, I certainly won't part with mine.


With the K24/2.8










No harm keeping the M28/3.5 since its so cheap.
Just that if I was to keep only one 28mm, then it will be the K28/3.5 and K24/2.8 (as the other lens )
Thanks for the clarification. I'm keeping both. The little I tested so far I found out that the K seem to demand a bit more light than the m (on the K-7). But it isn't any downside to that. Just something I noticed.
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