Pentax 645z Review

The last week was spent shooting a few thousand frames through the Pentax 645z. This is Pentax’s new somewhat-affordable medium format system. We wanted to take a real world approach to how we would shoot the camera, so this review will be less technical and more about how it performed on the job.  We took it to a full wedding, a weeks worth of portrait sessions and a night shoot.

Medium format digital cameras have been on our mind lately and this did not let us down. This is one of the many current medium format offerings to use the 51mp CMOS sensor produced by Sony. This new CMOS sensor is a huge deal for the way we shoot, mainly because it allows useable high-iso and live view, this wasn’t possible with the previous generation of medium format digitals.

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pentax 645z vs canon 5d mark iii photo

Lenses

For lenses we used both the Pentax 55mm f/2.8 and the fastest lens available for the system, the 105mm f/2.4 from the Pentax 67 film camera. The 55mm is equivalent field of view to ~43mm, it performed well offering very little distortion and great sharpness even wide open. Pentax very much needs to come out with a faster ~50mm equivalent lens.

**dream**

A f/1.4 lens would be great – it would give two more stops of light and f/1.1 equivalent depth of field.

**/dream**

An interesting note about this camera, you can adapt the readily available and affordable Pentax 67 lenses. There are even a few 67 lenses with leaf shutters should you decide to get strobey.

645z portraitRevival drum and bass artist photoPortland Drum & Bass Artist Revival

High ISO

The camera performs amazingly well shooting at night or in low light with high ISO. There was very little noise in the files, and when it was present it remained somewhat pleasing. We’d feel comfortable shooting up to 12,800 iso for color images, no question. 25,600 is doable if there is some light source or if you plan on going black and white.

The downside is that you really need the high iso. The combination of 2.8 apertures, a giant mirror slapping around, and 51MP resolution makes shooting at slower shutter speeds difficult. We needed to be closer to 1/250th to feel confident we’d have a sharp hand held image.

It is amazing how much shadow detail is retained with the Pentax. Even at higher ISOs the files help up remarkably in post, we were able to boost a 12,800 ISO shot over a stop in post with no problem.

burnside bridge night photo(ISO 6400, f/2.8, 1/60th)pentax-645z-review-0016(ISO 6400, f/2.8, 1/60th)night portrait 645z(ISO 25600, f/2.4, 1/125th)

Auto Focus

The 27 point system is clustered near the center of the viewfinder, making it somewhat limiting.  We did most of our shooting using the center point and recomposing. It was relatively accurate with most of the images we took being tack sharp at 100%. That said, it was fairly slow, difficult to nail focus on anything moving, and autofocusing in a backlit situations felt nearly impossible.  The AF is also very slow and difficult when using Live View, but you can turn on focus peaking and manually focus very accurately.

pentax 645z wedding portrait

Dynamic Range

It is good enough for our needs. I’ll never know if it is 13stops or 15stops, not going to take the time to test that.  You could spend hours dodging and burning on any image. There is a massive amount of detail in the shadows and the highlight detail is decent. I do recommend using live view for real-time blown highlight warnings, it is actually useful because it doesn’t use the preview jpeg to generate the warning, but the actual raw sensor data.

pentax digital medium format dynamic range test imagepentax 645z dynamic range photopentax-645z-review-0020

Ergonomics

This is a big camera, weighing in at 1555 grams (50% more than the Canon 5D), but it has a very comfortable grip. It felt like using an oversized full frame dslr. I’d have no problem shooting this all day. The button placements don’t seem to be as refined as Canon/Nikon. I’d love to see a joystick on the back for moving AF points and the zoom box in Live View.

pentax-645z-review-0008

The Files

Big and beautiful with brilliant color detail. The reason you get this camera. Viewing the files at 100% revealed sharp detail. The files are large (8256 pixels x 6192 pixels), around 60mb per file, so editing them takes a powerful machine or patience as a file renders a change.  I don’t foresee us using this camera for a full wedding day, but more of the way we integrate film by breaking it out for a few portraits and essential parts of the day.

pentax medium format digital 645z photoman portrait 645 digital photo100% view645z 100% crop photopentax-645z-review-0031portland medium format digital photographypentax-645z-review-0006sauvie island medium format digital photo

We purposely underexposed many of the images to see what the latitude of the files could handle. To our surprise, we were able to bring up deliverable images 5 stops in Lightroom. It doesn’t work in the opposite direction however, overexposing leads to blowing highlights and poor color retention.

before image645z pushed 5 stops photo

Depth of Field

I want to dispel one point that I see mentioned in almost every digital medium format camera review, the depth of field. I think people are confusing the fact that they are looking at a 51mp image at full size, it looks like the DOF is razor thin.. compare files at normal sizes and you’ll quickly notice how it isn’t crazy at all.

This sensor is not “full-size” medium format, it is not 6×4.5cm, but 44mm x 33mm. This gives you a crop ratio of .7873 from 35mm full frame cameras, you can multiply your aperture by that ratio to get an estimate of equivalent DoF from the same distance. It is only ~2/3rds of a stop difference wide open on the 2.8 lenses.

The 105mm f/2.4 does give you equivalent DOF to f/1.8, making it a nice portrait lens on this system.

cappuccino barista portland photo

Example Images

This is a real world review, with example images edited how we would our normal work. We shot it how we would shoot our 5D’s, not from a tripod. Instead of a shot of a chart, you’ll see a portrait of our new kitten.

I’ll link to a few full-resolution images at the bottom for you to get a better idea of the resolution this camera is capable of.                  pentax 645z kitten photopentax-645z-review-0004 pentax-645z-review-0007 portland medium format digital photoiphone flashlight app portraitISO 6400 | f/2.4 | 1/60thpentax-645z-review-0012ISO 12,800 | f/2.8 | 1/125thportland night photo ISO 6400 | f/2.8 | 1/125thportland long exposure pentax 645zISO 100 | f/2.8 | 5 secondspentax-645z-review-0019ISO 25,600 | f/4 | 1/160th – pushed 1.5 in Lr to see how files reacted. not bad.pentax 645z bride portraitpentax 645z wedding photobrenizer method pentax 645z wedding photo10 image Brenizer method panorama with the 55mm 2.8 | This could print life size.pentax-645z-review-0024 pentax 645z wedding ceremony photo pentax-645z-review-0027 night wedding photo iso 12800 ISO 12,800 | f/4.5 | 1/125thpentax-645z-review-0033pentax 645z test image pentax-645z-review-0035digital medium format portraitmedium format digital portrait pentax 645z couple photopentax 645z vintage car photoISO 800 | f/5.6 | 1/125100% detail shot pentax 645z100%

645z VS IQ250

This camera works much better for how we shoot than the Phase One IQ250. The IQ250 is great if you’re shooting tethered and has beautiful lenses, but the live view is not workable.

The IQ250 also has only one AF point, it is in the center of the viewfinder.. but it isn’t marked and does not light up when you’ve locked focus. Slightly odd.

luke and mallory leasure portrait photoLet’s wrap this up

This camera is incredible for high-detail, beautiful portraits. I can’t wait to shoot a few landscapes, especially at night. It isn’t for everything, it won’t replace your 35mm and it shouldn’t. I think we’ll end up adding one to our gear bag and use it along side our other cameras, it will definitely get the call for commercial work, stock photography, and landscapes. Portraits are incredibly detailed and I can’t wait to see some of these files printed huge. This is definitely a game-changing camera and it should prompt a new gear battle in the digital medium format arena. I hope for the rumors of Sony, Fuji, Nikon, and Canon joining in to all come true.

Files

Full Resolution Jpeg

DNG Files: High ISO, Couple Portrait, and Car photo.

 

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Comment

[…] Hands on review of the Pentax 645z with wedding and portrait example images.  […]
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October 17, 2014
Wow, your images are stunning... splendid work! Thank you for this review. I have a "very beginner" answer: what is the big advantage of a medium format compare to a reflex for example? Is there something to see with a reduction of distortion? Thank you again and keep up the good work,
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October 17, 2014
Increible DR!! :00
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October 19, 2014
UGH! That dynamic range. So jealous. Seriously would love to possibly try this camera out for a session. My canons have been leaving me hungry for some more dynamic range :(
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October 19, 2014
Oh, man! now I kinda wanna get a Pentax too. Freaking awesome as always you two wonderful people. <3
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October 20, 2014
This is a really helpful and well executed review. Thank you!
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October 20, 2014
Nice review! I like the way you tried out different features of the camera. Well explained.
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October 20, 2014
I'm almost tempted to say that the camera takes pretty pictures, but I won't ;) Since really, it always takes the talent of the photographer to make them beautiful. But heck, I'm tempted to try this one... maybe if I win the lottery someday ;)
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October 20, 2014
nice review guys, thanks a bunch!
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October 20, 2014
nice review guys, thanks a million!
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October 20, 2014
Can't even get over the richness of the colors and tones!
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October 21, 2014
Great review and even better photos.
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October 21, 2014
Amazingly informative. I love every example image.
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October 22, 2014
Thanks for the review guys. Really informative.
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October 22, 2014
Great shots! Thx for this game-changing camera review!
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October 23, 2014
Holy shit I really want that now. Looks like a badass camera.
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October 26, 2014
Great ! I was searching the web for not crappy images from it, and bim ! It's yours ! It would be awesome to compare same portrait with 35mm, same dof equivalent to see if the depth quality reputation of medium format is here, even with a cropped digital sensor.
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    October 26, 2014
    the depth is ~2.2 equivalent wide open.. It isn't a depth machine :)
October 27, 2014
Good review - the 100% preview is insane. Colours look sick, any SOOC shots?
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[…] 3. Pentax 645Z […]
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October 28, 2015
I really hope you guys review the Pentax FF when it comes out. :)
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December 12, 2016
Thank you for putting together a nice review. 645Z is very interesting but I'm also worried if I get disappointed because I'm more used to seeing 6x8 film scanned... maybe I should stick with that for portfolio and use 5D4 for everything else...
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