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08-18-2014, 06:44 AM   #1
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Pentax 645z vs Phase One IQ250 vs Hasselblad H5D-50c

Part 1


08-18-2014, 09:13 AM   #2
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Seems like the biggest difference is no leaf shutter and slower 1/125 sec max flash sync speed for the Pentax. Why isn't the max speed for the 645z 1/180 sec like all the other Pentax dslrs? Or better yet, why couldn't they design it to be 1/320 sec?
08-18-2014, 11:51 AM   #3
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QuoteOriginally posted by stillshot2 Quote
Seems like the biggest difference is no leaf shutter and slower 1/125 sec max flash sync speed for the Pentax. Why isn't the max speed for the 645z 1/180 sec like all the other Pentax dslrs? Or better yet, why couldn't they design it to be 1/320 sec?
I imagine that the 645Z shutter is an adaptation of the shutter of the other Pentax DLSRs, and that redesigning it for a higher sync speed was judged too expensive. I do wish that my K 5 had a higher sync speed, on the other hand the 645n sync is a blistering 1/60 of a second! Kinda hard to use flash in daylight....
Probably why the 150mm leaf shutter lens was made.
08-18-2014, 02:08 PM - 1 Like   #4
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QuoteOriginally posted by stillshot2 Quote
Seems like the biggest difference is no leaf shutter
There are a couple older Pentax 645 & 6x7 leaf shutter lenses that you can use on the 645Z. They may be an older design, but are better than no LS lens.

Phil.

08-18-2014, 07:54 PM   #5
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QuoteOriginally posted by stillshot2 Quote
Seems like the biggest difference is no leaf shutter and slower 1/125 sec max flash sync speed for the Pentax. Why isn't the max speed for the 645z 1/180 sec like all the other Pentax dslrs? Or better yet, why couldn't they design it to be 1/320 sec?
The sensor has to be fully open - i.e. the front curtain needs to be past the last edge and the trailing curtain needs to have not yet tripped past the first edge of the sensor.

As the sensor gets larger, that means the front curtain needs to move faster for this to happen.


Edit - whoops! Missed the punchline. This becomes more difficult when the sensor gets even larger.

Last edited by ElJamoquio; 08-18-2014 at 10:30 PM.
08-18-2014, 10:03 PM   #6
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Anyone else think the 100% crop comparison at 2:47 is waaaaayyyy cleaner on the Pentax?
08-18-2014, 10:57 PM   #7
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QuoteOriginally posted by Dat_Bokeh Quote
Anyone else think the 100% crop comparison at 2:47 is waaaaayyyy cleaner on the Pentax?
Yah, and that's with all settings for noise reduction off I believe he said. So I guess the main thing the 645* really needs is a new lens with a leaf shutter.

But even that doesn't seem to be a big deal.

Last edited by ZombieArmy; 08-19-2014 at 08:53 AM.
08-19-2014, 06:41 AM   #8
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Makes me laugh ... would like to know who sponsors these guys ...

08-19-2014, 09:20 AM   #9
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Different cameras for different purposes... and also a different cost.

'IF' you were doing primarily studio style work - and needed the high speed flash sync, then Pentax MAY NOT be your choice.
If you are doing just about anything else.... Pentax gear is at least 1/3 less and does a great job, and in many ways better. You will most likely not see these folks outdoors with any rain or dusty conditions. As you have seen from some of the medium format pictures in Pentax forums ... many are taken outdoors. How many Hasselblad/Phase One cameras go outside of a studio, with the exception of a booked photo shoot.
08-19-2014, 05:33 PM   #10
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Hasselblad and Mamiya cameras are taken out into the field often. There are many landscape photographers that use them. Even Phase backs on Alpa, Arca Swiss, Cambo, and Linhof technical cameras are used in the field. This is nothing special to Pentax.
08-24-2014, 08:34 AM   #11
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It's seems most people's inference is landscapes when it comes to talking about what's a good camera or lens in personal reviews. The features and conclusions about a camera are based on their perspective. That is, imaging a landscape photographer and a sports photographer talking to each other about what are best features for a camera or lens, for example.

This review is like that except from the perspective of what looks like a studio and fashion photographer. Now if it had been a landscape photographer doing a review perhaps we'd hear different strength/weaknesses. Back in the medium format film days it wasn't much different. Some camera/designs were more at home in the studio while other more at home out in the field.
08-24-2014, 09:27 AM   #12
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All I have to say is.....


This guys says, "I can't make it work", and I say, "if i was there i would have made it work".... but then, I'm pretty sure he knows that. He was just showing you what you get for your extra $30,000. There has to be something , right?
08-24-2014, 11:09 AM   #13
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Well looks like a great evening playing with expensive toys. Saddly video II is not in English.
08-24-2014, 10:48 PM   #14
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QuoteOriginally posted by monty Quote
Makes me laugh ... would like to know who sponsors these guys ...
Oh, it's easy to supose. Hasselblad is a friend of Broncolor, but this guy (Yankov Wong) is very friendly to Phamia and Profoto.
You can see it by yourself on his youtube channel:
08-25-2014, 11:36 AM   #15
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QuoteOriginally posted by stillshot2 Quote
Seems like the biggest difference is no leaf shutter and slower 1/125 sec max flash sync speed for the Pentax. Why isn't the max speed for the 645z 1/180 sec like all the other Pentax dslrs? Or better yet, why couldn't they design it to be 1/320 sec?
Id say the biggest difference is the modular vs. closed body design between Pentax and the other two and between the Hassy and the P1, it would be open vs. closed back system.
The availability of LS lenses is another of course, but to me the system design between the 3 is the major difference.
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