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Pentax 645, Pentax 645N and Pentax 645NII Compared
Posted By: Ole, 06-13-2009, 07:58 PM

Here is a chart showing the difference between the Pentax 645, 645N, and 645NII medium-format cameras.

Year introduced198419972001
MountPentax 645 APentax 645 AFPentax 645 AF
Meter range3 - 19 EV2 - 21 EV2 - 21 EV
Meter patterncenter-weightedm (6 segment) c sm (6 segment) c s
ISO range6 - 640012-640012-6400
Film type120 and 220 roll film, 70mm film120 and 220 roll film, 70mm film120 and 220 roll film, 70mm film
No. of exposures120 film: 15, 220 film: 32, 70mm: 90120 film: 16, 220 film: 33, 70mm: 95120 film: 16, 220 film: 33, 70mm: 95
Data imprint on filmNoYesYes
Exposure modesP, Tv, Av, M, B, XP, Tv, Av, M, B, XP, Tv, Av, M, B, X
Exposure compensation+/-3 EV+/- 3 EV+/- 3.3 EV
Exposure memory lockNoYesYes
Shutter speeds (auto)15 - 1/1000s30 - 1/1000s30 - 1/1000s
Shutter speeds (manual)15 - 1/1000s4 - 1/1000s, B6 - 1/1000s, B
Shutter speeds (mechanical)NoneNoneNone
Half step speeds in M and TvNoNoYes
Self timerNoYesYes
Mirror lock-upNoNoYes
Auto bracketingNoYesYes
Multiple exposuresYesYesYes
WinderBuilt-in, 1.5 fpsBuilt-in, 2 fpsBuilt-in, 2 fps
Built-in flashNoNoNo
TTL flashYesYesYes
P-TTL flashNoNoNo
Sync speed1/60s1/60s1/60s
Flash exposure compNoNoNo
AutofocusNoYes, (3 points)Yes, (3 points)
Autofocus sensitivityNot applicable-1 - 18 EV-1 - 18 EV
Viewfinder0.75x, 92% (vert), 93% (hor)0.76x, 92% (vert), 93% (hor)0.76x, 92% (vert), 93% (hor)
Viewfinder typeKeplerian telescopeKeplerian telescopeKeplerian telescope
Diopter correction-5 - +2-3.5 - +1.5-3.5 - +1.5
Exchangeable screenYesYesYes
Depth of field previewYesYesYes
Image size41.5 x 56 mm41.5 x 56 mm41.5 x 56 mm
Battery6 x AA6 x AA6 x AA
External battery packNoYesYes
Size (W x H x D)147 x 109 x 117 mm147 x 109 x 117 mm147 x 109 x 117 mm
Weight1320 g1280 g1280 g
CommentAccepts leaf shutter lens for flash synchronization to 1/500s.
Accessories: 120 and 220 film backs, 70mm film holder
Accepts leaf shutter lens for flash synchronization to 1/500s.
Accessories: 120 and 220 film backs, 70mm film holder. External battery pack
Accepts leaf shutter lens for flash synchronization to 1/500s.
Accessories: 120 and 220 film backs, 70mm film holder. External battery pack

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03-29-2011, 09:26 AM - 2 Likes   #2
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MetaD's Avatar

Join Date: Feb 2010
Location: Colorado
Posts: 103
Just to highlight the significant differences:

(1) Autofocus on 645N & 645NII.

(2) Single-mode knobs with green-for-auto indicators 645N & 645NII. 645 has fewer knobs, and sets modes through LCD panel and menus.

(3) Data Edge Printing on 645N & 645NII.

(4) Matrix metering, auto-bracketing, and exposure lock on 645N & 645NII.

(5) Mirror Lock-up on 645NII. (Most people say the mirror is well-damped and this isn't important).

Everything else is pretty minor. Maybe lack of self-timer on 645 matters to some.
03-29-2011, 02:29 PM   #3
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Location: Winnipeg, MB
Posts: 90
Thanks for posting!
05-21-2012, 08:35 PM   #4
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revdocjim's Avatar

Join Date: Jan 2011
Location: Mt. Akagi, Gunma Prefecture
Posts: 374
Thanks for the helpful info. But I have one very minor quibble. I recently found an external battery pack that would appear to be part of the original 645 system. But the chart above says the original 645 didn't have an external battery pack. As you can see in the photos below, the writing says "Pentax Remote Battery Pack 645" and the finish on the grip is identical to that of the original 645, which is distinctly different from the finish of the 645n. I tested it out on my 645n and it works fine.

11-13-2015, 02:54 PM   #5
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Join Date: Jun 2009
Location: Russia, St. Petersburg
Posts: 3
remote cord for 645 is a mechanical ones but for 645n/nII it's the same as for mz/zx series — cable switch F.
01-14-2019, 05:04 PM - 1 Like   #6
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Join Date: Jan 2019
Posts: 1
Old posts up there, but as I am looking through some info on the 645 NII and own 645, here are a couple of points to above

1. external battery pack was originally designed and supplied for the 645 and was never cosmetically updated to match the N models, all use same connector (so the table above needs to be fixed to reflect this, I use the pack with 645)

2. remote cables have somehow not been same, so the F does the 645 N, but CS-105 / CS-130 + TS-110 do the 645 NII. Lots of misinformation on these around the web (and don't rely on ebay descriptions), but 645NII manual has it right (naturally). All models will of course standard mechanical release cable.
05-18-2021, 02:26 AM   #7
Andrea K's Avatar

Join Date: Mar 2009
Location: Rome, Italy
Posts: 743
The 645 has the flash exposure compensation, there are two ways:
1- Use the Flash exposure compensation control
2- In M o X-Sync modes define a correct exposure with the shutter less or equal to 1/60, switch on the flash, use the exposure compensation control on camera: this will adapt the flash.


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