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01-10-2015, 08:35 PM   #16
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It is rather peculiar to use aspheric lenses in the construction such a long lens, astigmatism is more problematic with shorter lenses than long ones. But I suppose a fully Apochromatic design that eliminates astigmatism would be much more expensive to produce.

QuoteOriginally posted by boriscleto Quote
That's why Samyang makes a cine series now.
Bottom of the barrel Cine lenses - they are yet to surpass Zeiss, Cooke, and Angenieux.

01-11-2015, 04:14 AM   #17
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QuoteOriginally posted by Na Horuk Quote
I am just a little surprised it is "only f2.0." In the film era, there were many faster 135mm lenses, with high optical quality.
On an FF camera, f/2.0 will produce very shallow DOF. It will give you more OOF blur than a 85/1.4.

The Pentax K135/2.5 was a high quality lens and was not even "f/2.0".

Knowing Samyang, their 135/2.0 will be usable at f/2.0 and I think that's plenty fast (on FF).
Their 85/1.4 is excellent at f/1.4.
01-11-2015, 04:36 AM   #18
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QuoteOriginally posted by Class A Quote
On an FF camera, f/2.0 will produce very shallow DOF. It will give you more OOF blur than a 85/1.4.

The Pentax K135/2.5 was a high quality lens and was not even "f/2.0".

Knowing Samyang, their 135/2.0 will be usable at f/2.0 and I think that's plenty fast (on FF).
Their 85/1.4 is excellent at f/1.4.
Pointless it won't have in K-mount same as their new 50mm, well K135/2.5 if can be had what price was that on old lens? Might as well grab the newer samyang
01-11-2015, 05:14 AM   #19
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QuoteOriginally posted by Class A Quote
On an FF camera, f/2.0 will produce very shallow DOF. It will give you more OOF blur than a 85/1.4.

The Pentax K135/2.5 was a high quality lens and was not even "f/2.0".

Knowing Samyang, their 135/2.0 will be usable at f/2.0 and I think that's plenty fast (on FF).
Their 85/1.4 is excellent at f/1.4.
What one find "excellent" is surely a matter of taste, but I don't find the Samyang 85mm 1.4 excellent at 1.4. It's usable, which is already very good though. I find it excellent at 1.8 and up - that's just my experience with the lens, of course.
Anyhow, I hope this new lens is indeed very good from f2 and up. Otherwise, the gain would be very marginal for those who own the already very good DA* 50-135mm 2.8.

I'm interested in this lens, especially if Pentax gives us a digital FF to pair it with!

happy shooting.

01-11-2015, 06:26 AM   #20
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QuoteOriginally posted by Digitalis Quote
Bottom of the barrel Cine lenses - they are yet to surpass Zeiss, Cooke, and Angenieux.
Sure, but at a fraction of the cost. The Samyang is actually affordable for individuals, amateurs. I think Samyang delivers a lot, for the price. Better the Canon videographers buy Samyang cine lenses than manual Pentax lenses, de-clicking them and raising the prices on the used market
01-11-2015, 09:19 AM - 1 Like   #21
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.8 meters close focussing distance will also make it a nice close-up lens. My six element s-m-c Tak stops at 1.5.
01-11-2015, 09:26 AM   #22
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QuoteOriginally posted by D1N0 Quote
.8 meters close focussing distance will also make it a nice close-up lens
Whether it is any good at that setting remains to be seen - Without a fully apochromatic design this lens will likely have noticeable LoCa, close focusing tends to exacerbate that effect.
01-11-2015, 09:48 AM   #23
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QuoteOriginally posted by Digitalis Quote
Whether it is any good at that setting remains to be seen - Without a fully apochromatic design this lens will likely have noticeable LoCa, close focusing tends to exacerbate that effect.
I will probably be able to live with those as they are not going to worse than those of a m42 Tak from the early seventies.

01-11-2015, 06:28 PM   #24
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QuoteOriginally posted by D1N0 Quote
they are not going to worse than those of a m42 Tak from the early seventies
if you are referring to the SMC 135mm f/2.5 takumar - that lens was a disaster, I have never seen LoCa quite that bad before.
01-12-2015, 12:15 AM   #25
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I like it - there's not many KA mount options at that length at a reasonable price point (CV 125/2.5 or A135/1.8 are out of my budget). Hope it makes it to the light of day (and Pentax of course).
01-12-2015, 12:32 AM   #26
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QuoteOriginally posted by Digitalis Quote
if you are referring to the SMC 135mm f/2.5 takumar - that lens was a disaster, I have never seen LoCa quite that bad before.
FWIW, this was a simple four lens element design that unfortunately also exists in K-mount.

The six element K135/2.5 does not have an abundance of lens elements either, but is a lot better.
01-12-2015, 12:40 AM   #27
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QuoteOriginally posted by kp0c Quote
What one find "excellent" is surely a matter of taste, but I don't find the Samyang 85mm 1.4 excellent at 1.4.
Perhaps my copy is exceptionally good, perhaps we are using different evaluation standards.

I'm not talking about corner performance and am not saying the Samyang f/1.4 is as sharp at f/1.4 as the 43/1.9 is at f/5.6. However, not that many fast lenses are as sharp wide open as the Samyang 85/1.4 and the Samyang 85/1.4 does it at f/1.4. Of course it gains upon closing down, but with a bit of sharpening applied, I cannot complain about the f/1.4 performance.

QuoteOriginally posted by kp0c Quote
Otherwise, the gain would be very marginal for those who own the already very good DA* 50-135mm 2.8.
Well, there is bokeh as well (though the 50-135 is no slouch in that department) but most significantly the Samyang is an FF lens. It will probably be impressive on an FF camera. Let's hope it will appear in K-mount and Pentax (Ricoh) do their bit.
01-12-2015, 01:26 AM   #28
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QuoteOriginally posted by Class A Quote
FWIW, this was a simple four lens element design that unfortunately also exists in K-mount.

The six element K135/2.5 does not have an abundance of lens elements either, but is a lot better.
The last variant of the M42 SMC Takumar 135/2.5 was a six-element design as well, the same, I understand, as the later K-mount version. I bought my copy new in 1974, and I've always had great affection for it. Mind you, much of the film I shot with it on bodies from the SP-F to the K2DMD was monochrome, so any longitudinal CA wasn't particularly evident.
01-12-2015, 05:41 AM   #29
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QuoteOriginally posted by RobA_Oz Quote
The last variant of the M42 SMC Takumar 135/2.5 was a six-element design as well, the same, I understand, as the later K-mount version. I bought my copy new in 1974, and I've always had great affection for it. Mind you, much of the film I shot with it on bodies from the SP-F to the K2DMD was monochrome, so any longitudinal CA wasn't particularly evident.
That's the one I meant. Bokeh fringing is not nearly as bad as on my s-m-c 50 1.4 (which I love anyway).
01-12-2015, 07:24 AM - 2 Likes   #30
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The Samyang 135 mm f/2 ED UMC is said to have been officially announced but, at least from France, I get a 403 error (forbidden access).

135 mm f/2 ED UMC: syopt.com/en/camera/photo-lenses-135mm-F2.0-ED-UMC.php

135 mm T/2,2 VDSLR ED UMC (cinema version): syopt.com/en/camera/cine-lenses-135mm-T2.2-VDSLR-ED-UMC.php

Samyang's website : http://www.syopt.com



In the meantime, Dicahub indicates the main specifications:

- 11 elements, including one ED lens, in 7 groups
- Internal focusing
- Floating group for better results at short focusing distance


- Minimum focusing distance: 80cm
- UMC coating
- 9-blade aperture (rounded blades)
- Filter diameter: 77mm
- High-strength aluminum alloy frame
- Max. diameter: 82mm
- Length: between 119.1mm and 148.4 mm depending on the lens mount; Pentax K mount: 120.6mm
- Weight: between 815g and 880g depending on the lens mount; Pentax K mount: 820g
- Available mounts: Canon EOS, Nikon F (AiP), Pentax K, Sony Alpha, 4/3, 4/3, Canon EOS-M, Fujifilm X, Samsung NX and Sony E

MTF curves:


Last edited by Mistral75; 01-12-2015 at 07:36 AM.
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