Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
11-20-2015, 10:18 AM   #1
New Member




Join Date: Aug 2014
Posts: 16
Pentax 645Z vs Sony A7r II

I've recently taken hold of the new Sony A7r II and thought i'd have a go at a little side by side comparison with my Pentax 645Z. Also threw the Canon 5dIII in for fun.

Pretty interesting results. It's no double blind precision trial, but if you were wondering how the Sony compares in real world applications have a look - Sony A7r II vs Pentax 645Z vs Canon 5dmk III ? | Photographer Gareth Iwan Jones |

G

11-20-2015, 10:22 AM   #2
Pentaxian
bertwert's Avatar

Join Date: Jun 2015
Location: Golden, BC
Photos: Albums
Posts: 5,473
One would hope the 645z is better than the A7r II and 5D Mark III, $2500 (Canon) vs $3200 (Sony) vs $7000 (Pentax)...
Going to go read the article now...
11-20-2015, 10:31 AM - 1 Like   #3
Loyal Site Supporter
Canada_Rockies's Avatar

Join Date: Nov 2007
Location: Sparwood, BC, Canada
Photos: Gallery | Albums
Posts: 9,534
Fascinating comparisons. Thank you for doing all this work.
11-20-2015, 11:18 AM   #4
Pentaxian
FantasticMrFox's Avatar

Join Date: Oct 2014
Location: Scotland
Posts: 2,119
Amazing - the 645Z beats the A7R II for DR and noise performance. Most people would assume that the larger MF sensor inherently implies this, but historically digital MF sensors have not exactly been great performers in the noise department, so for me these results come as a bit of a surprise.

11-20-2015, 11:32 AM   #5
Loyal Site Supporter
Canada_Rockies's Avatar

Join Date: Nov 2007
Location: Sparwood, BC, Canada
Photos: Gallery | Albums
Posts: 9,534
Medium format sensors were more commonly CCD rather than CMOS. CCD gives better colours at low ISO. The trade off is that they are really very noisy as the ISO goes up. I just replaced my CCD sensor K10 with the new K3 with CMOS sensor, and I'm blown away by the high ISO lack of noise.
11-20-2015, 03:58 PM - 1 Like   #6
Senior Member
johnhilvert's Avatar

Join Date: May 2015
Location: Canberra, ACT
Posts: 176
Terrific series. While I can see the obvious resolution advantage of the medium format over FF, the relatively compact Sony A7r II rocks.
11-20-2015, 11:42 PM - 1 Like   #7
Veteran Member




Join Date: Sep 2013
Location: Pasadena, CA
Photos: Albums
Posts: 1,117
645Z did a terrific job. It looks like maybe 1 full stop of improvement noise performance, compared to A7? And maybe 2-3 compared to the canon.
11-21-2015, 03:48 AM   #8
Veteran Member
Kolor-Pikker's Avatar

Join Date: Dec 2014
Posts: 341
QuoteOriginally posted by FantasticMrFox Quote
Amazing - the 645Z beats the A7R II for DR and noise performance. Most people would assume that the larger MF sensor inherently implies this, but historically digital MF sensors have not exactly been great performers in the noise department, so for me these results come as a bit of a surprise.
Indeed, while both are based on the same core technology that was used for the 36MP D800 and A7R sensors, the A7RII is upgraded with BSI and should already have a stop better noise performance than the previous generation. This is why it can compete with the 5D3 at high ISO (3200/6400) despite having double the number of pixels.

Some of the things that give me mixed feeling about the A7RII is the fact that certain shooting modes throw you into 12-bit mode, and switching to the uncompressed RAW mode slows the camera down considerably. Reduction in physical size is not without loss, the bigger cameras quite simply have the capacity to dissipate a greater amount of heat from the sensor and electronics, which lets them shoot in any mode and under any amount of pressure without fail. Until mirrorless cameras solve their processing limitations, there will continue to be a place for DSLRs.

11-21-2015, 05:47 AM - 1 Like   #9
Pentaxian




Join Date: Apr 2014
Location: Baltimore
Posts: 556
Well, to me the Z is the obvious winner in all ways here---and I'm slightly surprised in the resolution category, where the difference is more than I would have expected. Throw in the fact that the Pentax lenses aren't supposed to be as good as the Canon or the Zony....As far as the price differential is concerned, You always pay the most for the last bits of excellence---true in all things. And let's not forget the overall build quality.

But one important thing for me, and I've said it before so maybe I'm sounding like a broken record, is that to get the most out of the Canon or the Sony you've got to get the best lenses out there, and they are not cheap. But I've been able to put together a set of lenses for my Z that is amazing at a price far, far below what it would have cost me to do with Canon or Sony. So, I think for me it's probably a wash in terms of cost, or possibly even cheaper!

The A7RII is obviously a terrific camera. I have the A7R, and know it to be excellent despite its shortcomings, ones that the A7RII improved upon. The Canon fails to impress me at all.
11-21-2015, 07:14 AM - 1 Like   #10
Pentaxian




Join Date: May 2011
Location: All over the place
Posts: 2,579
I have the A7RII, and I would agree that the Z is better in pretty much every way. The RII comes into its own in situations where I am now, in Scandinavia on small planes and travelling with others where it simply wasn't practical for me to bring the Z. There have been times when I wish I had it with me, such as today, when we went around and about Ulstenvik in Norway. Stunning light at times, but no time to mess about with the Z to do the camera justice. A7RII and the Loxia 35 f/2 and you have a lightweight easy to use camera and lens that you can just grab and go with. It's meant I can carry everything in a small camera bag and keep mobile. I'm picking up the 25 f/2 Batis next week.

Last edited by itshimitis; 11-21-2015 at 07:25 AM.
11-21-2015, 07:40 AM   #11
Pentaxian




Join Date: Oct 2013
Posts: 877
QuoteOriginally posted by Gareth Iwan Jones Quote
I've recently taken hold of the new Sony A7r II and thought i'd have a go at a little side by side comparison with my Pentax 645Z. Also threw the Canon 5dIII in for fun.

Pretty interesting results. It's no double blind precision trial, but if you were wondering how the Sony compares in real world applications have a look - Sony A7r II vs Pentax 645Z vs Canon 5dmk III ? | Photographer Gareth Iwan Jones |

G
Hi Gareth,

Thank you for the comparo. Sony looks very compelling indeed. I know the 645Z is superior but what about cost in weight and $$$ compared to say a Sony A7RII and a couple of Zeiss lenses vs. 645Z plus a few of the newer lenses.

I am sitting on the fence whether to let go of my DSLR outfit (K3+primes) and switch to a higher res platform. In anticipation of the 645Z, I have purchased a few legacy 645 lenses but I am still not sure if it is the right decision to go with the 645Z as opposed to the smaller Sony with much larger lens portfolio.

My focus is nature and printing big prints for presentation. I know on most of the tests, at least viewing on the monitor, 645Z is being seriously challenged. However, I have not seen any comparison large prints made from these cameras to see if the differences are as apparent on an actual print (30x40" and above).

Have you printed any large prints for presentation? Are the advantages of the 645Z as apparent there as well?

Any feedback would be appreciated.

Thanks,
Boris
11-21-2015, 02:25 PM - 1 Like   #12
Site Supporter
gavincato's Avatar

Join Date: Apr 2015
Location: NSW, Australia
Posts: 247
QuoteOriginally posted by btnapa Quote

Have you printed any large prints for presentation? Are the advantages of the 645Z as apparent there as well?

Any feedback would be appreciated.

Thanks,
Boris
Hi Boris,

Whilst I haven't specifically printed sony vs 645z side by side, I have printed some monster sized 645z prints and really thats where the camera shines. Theres nothing like seeing the print on paper & the detail on some of my printed landscapes is stunning.

If you pick good lenses (i.e. the 35/3.5, 55/2.8, 120 macro) and use the camera carefully at small apertures the results are incredible.
11-21-2015, 05:16 PM - 1 Like   #13
New Member




Join Date: Nov 2015
Posts: 18
I'm a new Z owner... but I have to say, aside from final image performance, the two cameras aren't even close in real world scenarios. I purchased the a7rII and used it for 2 weeks before packing it up and sending her back to BH. While the camera produced strong files, the user experience down right sucks. "There is heft" if your normal camera experience is an iphone. Sure, the body is a metal alloy (magnessium?) but the thing feel cheap as hell for the price tag. It has a plasticky feel. But again, I came from 8x10 so basically anything I can hold in my hands is light.

I made some 20x24 prints with basic color correction, no uprez or sharpening, and the prints were downright ridiculous. So much so that my classmates thought I was shooting 4x5 color.
11-21-2015, 05:33 PM   #14
Site Supporter
mikeSF's Avatar

Join Date: Jan 2009
Location: East Bay Area, CA
Photos: Gallery
Posts: 5,705
As expected, the 645Z is dazzling. Nice comparison
11-22-2015, 07:49 AM   #15
Pentaxian




Join Date: Oct 2013
Posts: 877
QuoteOriginally posted by gavincato Quote
Hi Boris,

Whilst I haven't specifically printed sony vs 645z side by side, I have printed some monster sized 645z prints and really thats where the camera shines. Theres nothing like seeing the print on paper & the detail on some of my printed landscapes is stunning.

If you pick good lenses (i.e. the 35/3.5, 55/2.8, 120 macro) and use the camera carefully at small apertures the results are incredible.
Thank you for your replay.

Although I LOVE my K3, the Three Amigos along with my Tammy 70-200, I feel the outstanding images I get from the package do no stand up to mega size prints. I shoot panos a lot but even then the resolution is not enough for detailed large prints (40"x120") unless I do multi-row panos which is a lot more work and processing time.

How large have you gone with your prints?
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
645d, 645z, 645z vs sony, a7r, base, camera, canon, choice, distance, fe, flickr, focus, ii, lens, lenses, medium format, pentax, pentax 645z vs, results, scale, shutter, size, sony, vs, vs sony a7r
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Sony A7R-II ARW 2.3 to DNG converter peterh337 Digital Processing, Software, and Printing 6 10-13-2015 05:55 AM
Pentax 645D vs Sony A7R RAW JohnBee Non-Pentax Cameras: Canon, Nikon, etc. 22 06-10-2015 09:23 PM
Sony A7R II & PENTAX FF LFLee Non-Pentax Cameras: Canon, Nikon, etc. 26 05-17-2015 04:38 PM
Sony A7R & Pentax lenses fnflying Pentax SLR Lens Discussion 3 05-05-2014 12:56 PM
DSLRmagazine: Sony A7r vs Nikon D800 and A7 vs Leica M test. Sony is the best! Clavius Non-Pentax Cameras: Canon, Nikon, etc. 3 01-14-2014 10:25 AM



All times are GMT -7. The time now is 04:29 PM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top