Which 135mm one to keep? smc pentax-m 3.5, Takumar (Boyonet) 2.5 or smc Takumar 3.5

ZombieArmy · 06-07-2019, 10:02 PM

I'd keep the tak bayonet, the others aren't interesting or significant enough to give up for the performance. People talk about flare but honestly if you need a lens for such demanding situations get the Samyang and save yourself some headache. If you want Tak Bayonet performance for a bit more money get the Pentax-A 135 f2.8 since it matches the tak bayonet in sharpness while having the coatings.

glasbak · 06-09-2019, 08:02 AM

The screw mount takumar is optical the best of the three on 'full frame', the lower edge performace of the M goes unnoticed on apc-c, build quality of the screw mount is the best, the bayonet takumar the worst (mine keeps getting grease on the aperture blades, even after several cleanings).

Darkover · 06-09-2019, 10:00 AM

Originally posted by tonyzoc

I'm surprised no one mentioned the SMC Pentax 135mm f/2.5 lens.

I am suprised, too. You can find the 135/3.5 on every fleamarket for cameras and it is bad! The 135/2.5 is more seldom, but MUCH better. I use it often on my K1 and I think it is in the same class than the 85/1.8.

You should buy one if you find it in good condition.

Olaf

**GUB** · 06-09-2019, 02:11 PM

Individual lens variation would more than make up the IQ difference between these three. You need to do a test comparison on your three.
My M135 3.5 is easily the worst and my Tak Bayonet 135 2.5 is the best.
Obviously the 2.5 is a more versatile lens if you wish to utilise it wide open.
I don't notice any significant difference in the coatings.

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06-07-2019, 10:02 PM	#16
ZombieArmy Pentaxian Join Date: Jun 2014 Location: Florida Posts: 3,210	I'd keep the tak bayonet, the others aren't interesting or significant enough to give up for the performance. People talk about flare but honestly if you need a lens for such demanding situations get the Samyang and save yourself some headache. If you want Tak Bayonet performance for a bit more money get the Pentax-A 135 f2.8 since it matches the tak bayonet in sharpness while having the coatings.

06-09-2019, 08:02 AM	#17
glasbak Veteran Member Join Date: Apr 2009 Location: Netherlands Posts: 369	The screw mount takumar is optical the best of the three on 'full frame', the lower edge performace of the M goes unnoticed on apc-c, build quality of the screw mount is the best, the bayonet takumar the worst (mine keeps getting grease on the aperture blades, even after several cleanings).

06-09-2019, 10:00 AM	#18
Darkover Forum Member Join Date: Dec 2016 Posts: 76	Originally posted by tonyzoc I'm surprised no one mentioned the SMC Pentax 135mm f/2.5 lens. I am suprised, too. You can find the 135/3.5 on every fleamarket for cameras and it is bad! The 135/2.5 is more seldom, but MUCH better. I use it often on my K1 and I think it is in the same class than the 85/1.8. You should buy one if you find it in good condition. Olaf

06-09-2019, 02:11 PM	#19
GUB Loyal Site Supporter Join Date: Aug 2012 Location: Wanganui Photos: Gallery \| Albums Posts: 5,760	Individual lens variation would more than make up the IQ difference between these three. You need to do a test comparison on your three. My M135 3.5 is easily the worst and my Tak Bayonet 135 2.5 is the best. Obviously the 2.5 is a more versatile lens if you wish to utilise it wide open. I don't notice any significant difference in the coatings.