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04-15-2011, 05:16 AM   #1
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Which one would you keep?

I've just got myself a K135 f2,5 in excellent shape, optically perfect. It was too good to pass.

I already own a M150 f3,5. The K is a monster compared to it. I'll run some tests and decide which one I keep, but just for fun, I'd like your opinion : which one would you keep?

I'll post pictures of the two sisters side by side later today or tomorrow. It's really impressive to compare the size of the lenses, M lenses and a half-stop will do wonders...

04-15-2011, 05:50 AM   #2
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Keep both.
They are not same. I keep both mine K135f2.5 and M135f3.5. Very handy when weight is a concern at daylight. The M150f3.5 is a good lens and a relatively rare too. You may get a good price for it. Keep both if you can. If you have to let one go, keep the K135f2.5.

Monster? just wait until you can hold the K200f2.5 ;-)
04-15-2011, 06:19 AM   #3
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I'm not sure I can justify keeping both. And I force myself to only keep lenses that serve a purpose. The M150 didn't see much action as it is, but it was there for some critical situations. I don't see the K135 serving a really distinct purpose.

I'll test them side by side to evaluate their optical performances, and might decide based on that,. The smaller size and rarity of the 150 are qualities, sure, and the 135 would probably fetch a higher price, but its speed might be a higher perk than size.

I'll see, but I'm still interested in opinions!
04-15-2011, 07:14 AM   #4
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I keep the K135f2.5 for low light concerts. My kit for concert consists of K50f1.2, K85f1.8, K135f2.5 (and K200f2.5), and some narrow spaces, the K35f2 as well. They are also better optical than the M-lenses at the same aperture.

When you testdrive these lenses, there are some limitations to aware of like highkey, flares and CA (/PF). M-lenses wide open will have a bit glow on highlights. That makes them softer. The K135f2.5 does have these glows, but not as much, hence better IQ at f2.5, and very good step down at f3.5, when the M-lens counter part still stays wide open and suffers at its very limit.

The M150 can also be replaced by your FA100-300 ;-)

04-15-2011, 07:54 AM   #5
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QuoteOriginally posted by hoanpham Quote
They are also better optical than the M-lenses at the same aperture.
I understand that you have a strong bias towards K lenses. This one is my first, actually, though I've had many M lenses in the past.

QuoteOriginally posted by hoanpham Quote
The M150 can also be replaced by your FA100-300 ;-)
With that reasoning, so can the K135... though the 100-300 is much slower than either as you well know

It will probably boil down to IQ around f3,5 and general pleasure while in use. Great info about the highlights glow, I'll look for that and try to see if I can spot it.
04-15-2011, 08:04 AM   #6
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I don't have experience with any of them but I'd give you advice anyway: keep the one you use (will use) more. There isn't a point of having great lens when it's sitting on a shelf collecting dust. If you won't be taking the 135 because of it's size then what's the point?
04-16-2011, 05:13 PM   #7
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You're absolutely right, of course. I'll have to decide if the size bothers me. The difference is quite dramatic, but the 135 is not too large, it's just that the 150 is so small!

IQ will be the deciding factor, probably.
04-16-2011, 09:54 PM   #8
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I have the M135/3.5, the K135/2.5 and the S-M-C-T 150/4. The Takumar I got out of curiosity but apparently haven't been curious enough to actually use it for anything. The other two, I use about equally. I can't see any difference between the 135s at say f5.6 and above. It comes down to size or light. I could sell one but would probably regret it enough to repurchase it.

Pricing the M150/3.5 might be a challenge.

04-17-2011, 03:59 AM   #9
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QuoteOriginally posted by Just1MoreDave Quote
Pricing the M150/3.5 might be a challenge.
You're right. It's quite a collector's item, I think.
04-17-2011, 07:55 AM   #10
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Here are the two sisters side by side as promised:





The difference is really striking when comparing the diameters (58mm vs 49mm).
04-17-2011, 02:16 PM   #11
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Ks? love em...
K135 f/2.5 for me, bigger & faster = better in this case I think. For you? take em both out and see what they can do, pick the one that delivers the most for you.
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