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FORUMS Other Digital Cameras Medium Format Digital Cameras and Backs 
Thread started 01 Dec 2014 (Monday) 15:10
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Anyone with Pentax 645Z?

 
bobbyz
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Dec 01, 2014 15:10 |  #1

For studio and outdoor portrait/model shoots?


5dmk3, 35L, 85L II, 300mm f2.8 IS I, 400mm f5.6
Fuji XT-1, 14mm f2.8, 23mm f1.4, 35mm f1.4, 56mm f1.2, 90mm f2, 50-140mm f2.8

  
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pyrojim
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Dec 01, 2014 16:19 |  #2

Currently, there are no leaf shutter lenses for the pentax 645 system. As such, you may run into problems with flash sync speed on some lighting setups.

Medium format just demands more light, and thus more power.


However, pentax seems to have made considerable advances in tethering, which would be something of great value in ANY studio work. If you go outside, you could tether to a surface pro 3.... Think about that for a minute...


The Mamiya/Phaseone system is worth a look too, as there are many leaf shutter lenses available, and many digital backs are easily purchased from a number of retailers at a variety of price points.


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TheFloridaShooter
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Dec 01, 2014 20:10 |  #3

I picked up a 645z about a month ago. I'm still playing with it and so far I'm liking the results.


1Dx MKII | 1Dx | 5D MKIV | 5D MKIII | 5Ds r | 5Ds | 7D MKII | 7D | G16 | G3x | EOS M & M3 | 800 f5.6 | 600 f4 | 400 f2.8 | 300 f2.8 | 200-400 f4 | 100-400 f4.5 - 5.6 II x 2 | 70-200 f2.8 | 14 f2.8 II | 50 f1.2 | 50 1.4 | 85 f1.2 | 135 f2 | 24-70 f2.8 II | 11-24 f4 | 35 f1.4 II | Pentax 645Z | SMC Pentax-DA 645 25mm F4 AL | SMC Pentax-D FA 645 55mm F2.8 AL | Pentax 90mm f/2.8 D FA 645 Macro ED AW SR | SMC Pentax-D FA 645 200mm f/4 IF | SMC Pentax-D FA 645 300mm f/4 ED IF | SMC FA 645 400mm f/5.6 ED IF Lens

  
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bobbyz
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Dec 01, 2014 20:39 as a reply to  @ TheFloridaShooter's post |  #4

Any pictures to share?


5dmk3, 35L, 85L II, 300mm f2.8 IS I, 400mm f5.6
Fuji XT-1, 14mm f2.8, 23mm f1.4, 35mm f1.4, 56mm f1.2, 90mm f2, 50-140mm f2.8

  
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quadwing
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Dec 02, 2014 02:54 |  #5

bobbyz wrote in post #17302670 (external link)
Any pictures to share?

Yes, please, please pictures!


Camera gear: Canon 5D Mark IV | Canon 24-70mm f/2.8L II | Canon 70-200mm f/2.8L II | Lights: Elinchrom Ranger RX Speed AS

  
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Brian_R
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Dec 02, 2014 08:15 |  #6

pyrojim wrote in post #17301632 (external link)
Currently, there are no leaf shutter lenses for the pentax 645 system. As such, you may run into problems with flash sync speed on some lighting setups.

Medium format just demands more light, and thus more power.

so youre telling me that not a single one of the older pentax lenses are leaf shutter? and im not sure i understand how MF demands more light. sensor size has no impact on how much light is needed for an exposure. the exposure is the same for all formats although you do indeed want more light on medium format to get deeper DOF so that your shot will be in focus




  
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bobbyz
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Dec 02, 2014 08:56 |  #7

Brian_R wrote in post #17304223 (external link)
so youre telling me that not a single one of the older pentax lenses are leaf shutter? and im not sure i understand how MF demands more light. sensor size has no impact on how much light is needed for an exposure. the exposure is the same for all formats although you do indeed want more light on medium format to get deeper DOF so that your shot will be in focus

I didn't understand the other poster reply either. Unless 645Z has sync speed os like 1/60, shooting outdoors with strobes shouldn't be an issue. Maybe I am missing something.


5dmk3, 35L, 85L II, 300mm f2.8 IS I, 400mm f5.6
Fuji XT-1, 14mm f2.8, 23mm f1.4, 35mm f1.4, 56mm f1.2, 90mm f2, 50-140mm f2.8

  
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Wilt
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Dec 02, 2014 11:09 |  #8

Brian_R wrote in post #17304223 (external link)
so youre telling me that not a single one of the older pentax lenses are leaf shutter?

The film Pentax 645 absolutely did have a few leaf shutter lenses!!! So unless none of those lenses were compatible with the 645Z, there indeed are leaf shutter lenses.

When you use leaf shutter lenses with the 645, you do lose exposure automation as the leaf shutter is not coupled to camera metering for automation of shutter speed selection.


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Canon dSLR system, Olympus OM 35mm system, Bronica ETRSi 645 system, Horseman LS 4x5 system, Metz flashes, Dynalite studio lighting, and too many accessories to mention

  
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Brian_R
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Dec 02, 2014 14:03 as a reply to  @ Wilt's post |  #9

those old lenses are compatible which is why i posed the obvious and rhetorical question because there are plenty of leaf shutter lenses available for pentax 645 film and digital. i think losing exposure automation isnt a big deal considering how dirt cheap vintage pentax 645 glass is and pair that with the less expensive 645D and you have a killer digital medium format kit :-D




  
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Kolor-Pikker
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Post edited over 3 years ago by Kolor-Pikker. (4 edits in all)
     
Dec 03, 2014 10:47 |  #10

I recently acquired a Pentax 645Z and 55mm f/2.8 SDM, 120mm f/4 macro and 150mm f/2.8 IF, here is a picture comparing the 645Z with 55mm to a 5D2 with 24-70LII on it:

IMAGE: https://dl.dropboxusercontent.com/u/41183616/pentax645size.jpg

The 645Z is the same width and height, so looking at it from the front it looks like a regular DLSR, but it's about twice as deep and also a bit heavier.

Here is a quick shot I took at the airport while getting off my flight, it's a two shot stitch, handheld:

IMAGE: https://dl.dropboxusercontent.com/u/41183616/sherry.jpg

100% crop showing off the shadows
IMAGE: https://dl.dropboxusercontent.com/u/41183616/crop.jpg

I ended up pushing the shadows roughly 3 stops, the original exposure looked like this (just a link to save space)
https://dl.dropboxuser​content.com/u/41183616​/before.jpg (external link)

The FA lenses do have incredible resolution, but are showing their age in terms of fringing, which they may have a lot of in high-contrast light; it is fairly trivial to clean up in Lightroom however. I'm a ways off from buying the new Pentax lenses, but the 90mm Macro and 28-45mm f/4.5 zoom do have my interest, and may be more suited to the 51MP sensor.

In terms of noise the 645Z at ISO 12,800 looks about the same as my 5D2 at 3200 but with a nicer noise pattern and cleans up better with some NR applied - at 100%, that is, if equalized to the same print size the 645Z would be better still. Otherwise, at ISO100, the images are smooth as glass, I have never seen a digital image so "pure" such that one wouldn't normally it see outside of computer generated graphics. It makes it that much harder for the optics to hide their flaws.

At 33x44mm the 51MP sensor would have 30.5MP if cropped down to full-frame 35, so it actually has a lower pixel density than the current group of cameras using the 36MP Sony sensor like the D810 and A7R, meaning that you can get away with using smaller apertures, and with the reduced depth of field, you'll have to.

5DmkII | 24-70 f/2.8L II | Pentax 645Z | 55/2.8 SDM | 120/4 Macro | 150/2.8 IF
I acquired an expensive camera so I can hang out in forums, annoy wedding photographers during formals and look down on P&S users... all the while telling people it's the photographer, not the camera.

  
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Stan43
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Post edited over 3 years ago by Stan43.
     
Dec 05, 2014 20:34 |  #11

Just got the 645Z and three lenses,120macro,55 2.8 and the new 28-45 zoom. I am loving it. Easy to use,even hand held and the IQ is tremendous. I,ll post some pictures soon.
Looks like I will be settling on the Pentax and fuji systems and selling the canon stuff.


Canon: 5DSr,5Dmk3,1DXmk2 5d MK4,11-24L,35L,70-200 2.8L2,24-105L,24-70L,Sigma 24-105 Art,50 1.4 Art,Tamron SP85 1.8,Tamron SP90 Macro. Zeiss 135 F2 Milvus
Pentax 645Z,90 2.8 Macro,55 2.8,24-48 . Fuji: EX2,XT1,14mm,18-55,56,55-200,Zeis Touit 2.8 Macro

  
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Alveric
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Post edited over 3 years ago by Alveric. (2 edits in all)
     
Dec 05, 2014 20:38 |  #12

bobbyz wrote in post #17304365 (external link)
I didn't understand the other poster reply either. Unless 645Z has sync speed os like 1/60, shooting outdoors with strobes shouldn't be an issue. Maybe I am missing something.

The sync speed is 1/125 sec. Yes, this is a major issue outside in full sun, especially if you want to darken the background/ambient. ND filters and powerful strobes become a necessity.

I was interested in the Pentax medium format solution, but after getting my hands on the PhaseOne systems this past Tuesday at a PhaseOne event I'm not anymore.


'The success of the second-rate is deplorable in itself; but it is more deplorable in that it very often obscures the genuine masterpiece. If the crowd runs after the false, it must neglect the true.' —Arthur Machen
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bobbyz
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Dec 06, 2014 00:40 as a reply to  @ Alveric's post |  #13

Most 5d are 1/160 so not that far from 1/125. Phase one I would love to but you talking 4-5 times the price of 645, I assume.


5dmk3, 35L, 85L II, 300mm f2.8 IS I, 400mm f5.6
Fuji XT-1, 14mm f2.8, 23mm f1.4, 35mm f1.4, 56mm f1.2, 90mm f2, 50-140mm f2.8

  
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Alveric
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Dec 06, 2014 00:50 |  #14

5D's are 1/200. The 6D is 1/160. With some radio systems you lose an extra third of a stop; so it'd be 1/160 on the 5D and 1/125 on the 6D. That's already effectively 1 stop from the 1/250 of the top grade models. Believe me, it does make a difference.


'The success of the second-rate is deplorable in itself; but it is more deplorable in that it very often obscures the genuine masterpiece. If the crowd runs after the false, it must neglect the true.' —Arthur Machen
Why 'The Histogram' Sux (external link)

  
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bobbyz
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Post edited over 3 years ago by bobbyz.
     
Dec 06, 2014 09:23 as a reply to  @ Alveric's post |  #15

I know. That's why even 640ws of Einstein wasn't enough when I was shooting out in the afternoon sun. But then those situations are rare for me. I would definitely want some new break throughs on max sync speed side with electronic shutters but so far nothing for CMOS sensors.


5dmk3, 35L, 85L II, 300mm f2.8 IS I, 400mm f5.6
Fuji XT-1, 14mm f2.8, 23mm f1.4, 35mm f1.4, 56mm f1.2, 90mm f2, 50-140mm f2.8

  
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Anyone with Pentax 645Z?
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