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10-29-2014, 10:00 PM   #1
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Anything faster than f2.8 for medium format?

Super happy with the 645z, selling a lot of my Canon gear, but I think I will miss f1.2 lenses, is there nothing f1.2 for this format?

10-29-2014, 10:17 PM   #2
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QuoteOriginally posted by Victor Wolansky Quote
Super happy with the 645z, selling a lot of my Canon gear, but I think I will miss f1.2 lenses, is there nothing f1.2 for this format?
There's a Mamiya 80/1.9 - Not 1.2, but it's pretty fast and has a DOF 'close' to 1.2 on 35mm.

There's also some aerial photography lenses that boast things like f0.75, but they're softer than cotton and aren't really viable for normal images. (There's other such lenses as well, like the 25/1.0 fisheyes made for the Canadian gov't to research the aurora in the north.

I'm sure someones special ordered a 1.2 or 1.4 lens for a MF camera, but it no doubt weighs 20 lbs and is cost prohibitive.
10-29-2014, 10:56 PM   #3
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QuoteOriginally posted by Victor Wolansky Quote
Super happy with the 645z, selling a lot of my Canon gear, but I think I will miss f1.2 lenses, is there nothing f1.2 for this format?
There are no Pentax 645 lenses faster than F2.8. The adaptable 6x7 105mm F2.4 is a bit faster, but that's about as good as it gets. Ultra-fast lenses are a sacrifice you pretty much have to make when shooting MF, but it's not that big of a deal for most applications.

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10-30-2014, 12:05 AM - 2 Likes   #4
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If you want something faster than f/2.8 for medium format I hope your biceps are bigger than your wallet :



The Zoommatar 240mm f/1.2 - Allegedly only 10 of these were ever made for Pentax 67 format, also they made a 180mm f/1.3 for Nikon F mount:



It turns out that these lenses are so rare that no one has ever actually used them to take photographs. Much like the fabled Pentax 20mm f/1.4 - the lens hood exists for it, but the lens itself is nowhere to be found.

10-30-2014, 12:26 AM   #5
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A couple of years ago I sold my Mamiya 645 with a 80mm f/1.8 lens. I wish I hadn't
10-30-2014, 12:34 AM   #6
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Of course for current in-production medium format fast glass: the lens line up for the Leica S, which offer a 70mm f/2.5, 35mm f/2.5, 110mm f/2, a 24mm f/3.5 and 180mm f/3.5 - buying all these will set you back about $48,240USD - and to actually use them you have to buy the Leica S camera which currently sells for $21,950USD

QuoteOriginally posted by Sandy Hancock Quote
A couple of years ago I sold my Mamiya 645 with a 80mm f/1.8 lens. I wish I hadn't
Aren't you referring to the Mamiya Sekor 80mm f1.9?

Last edited by Digitalis; 10-30-2014 at 12:42 AM.
10-30-2014, 12:53 AM   #7
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There was a Mamiya with 80/1.9 for sale locally back when I started MF a couple of years ago and I often regret not going for that over my Pentax 645. The Pentax is a very nice camera and the 75/2.8 is a great lens, but f/1.9 is f/1.9.

I think a 120mm f/2.4 portrait lens for the Pentax 645 system would sell very well.
10-30-2014, 06:35 AM   #8
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QuoteOriginally posted by Jonathan Mac Quote
I think a 120mm f/2.4 portrait lens for the Pentax 645 system would sell very well.
Don't forget LS designation - all the system doomsayers will be abated then.

10-30-2014, 07:32 AM - 1 Like   #9
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There isnt really much need for lenses faster than f2.8 on MF since the DoF becomes incredibly thin, and more importantly, the lens dimensions become, as noted, impractically huge. I'd rather see some f1.2 lenses for our APSC sensors first
10-30-2014, 09:21 AM   #10
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With regards to DOF, i think the previous lenses were optimised for film 645, which has a larger film/sensor size (56 x 42mm, crop factor 0.6) than the current digital medium format (44 x 33mm, crop 0.8). The F2.8 then would be equivalent to DOF of F1.7 in 35mm, now its just F2.2.
10-30-2014, 09:44 AM   #11
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QuoteOriginally posted by Na Horuk Quote
There isnt really much need for lenses faster than f2.8 on MF since the DoF becomes incredibly thin...
Yes on say a 6x7 systems with a normal lens around 100mm but not on the cropped 645Z sensor size. The normal lens is around 55mm. And on a 35mm format the normal lens is 50mm.
10-30-2014, 10:05 PM   #12
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Thanks for the information, I certainly not want to carry around such a beast :-)
10-31-2014, 06:02 PM   #13
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One of the nice and fast lenses for the 645 system is the 12.5cm Leitz Hektor, that is easily adapter through commonly available M39 adapters.
10-31-2014, 07:24 PM   #14
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QuoteOriginally posted by Lacunapratum Quote
One of the nice and fast lenses for the 645 system is the 12.5cm Leitz Hektor, that is easily adapter through commonly available M39 adapters.
The M39 lens mount is a precursor to the Leica M mount - which is dedicated to 35mm format lenses, the Leitz hektor 12.5cm f/2.5 would be impossible to use on 645 format.
10-31-2014, 07:35 PM   #15
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QuoteOriginally posted by Digitalis Quote
The M39 lens mount is a precursor to the Leica M mount - which is dedicated to 35mm format lenses, the Leitz hektor 12.5cm f/2.5 would be impossible to use on 645 format.
Except when you use it.
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