Straight answer, both halves of it. Your GX-20 does record its actuation count — in the Pentax MakerNote, tag 0x005D, exactly where its twin the Pentax K20D puts it. And the parser on this site will not give it to you: it decides which files reach its Pentax decoder by the EXIF Make string, and a GX-20 says Samsung. That is a gap in this code, not in your camera, it is measured rather than assumed, and the fix in your hands today is one exiftool command.
Samsung and Pentax announced the GX-20 and the Pentax K20D together on 23 January 2008, the last of three Pentax-built bodies Samsung sold under a partnership agreed in 2005. The division of labour was unusual and worth knowing, because it is the reason this camera exists at all: Pentax developed the body, Samsung manufactured the 14.6 MP APS-C CMOS sensor that both cameras share. At launch it was the highest-resolution APS-C sensor on the market.
What separates the two bodies is thin: button shape and lettering, the shape of the hand grip, each camera’s own firmware and JPEG processing, and a battery grip that is not interchangeable with the K20D’s. One difference does matter to anyone reading metadata. The GX-20 does not write Pentax’s PEF format at all — its raw files are Adobe DNG, written by the camera itself.
It was also the end of the line. The GX-20 was the final K-mount DSLR Samsung sold; a GX-30 was rumoured through 2009 and never released, and in February 2010 the company restarted with the mirrorless NX10 and its own mount. A GX-20 on a second-hand shelf today is therefore an orphan twice over: a discontinued body from a brand that left the camera business in 2016, wearing a badge that its own metadata tooling was never really written for.
| Announced | 23 January 2008, alongside the Pentax K20D |
| Relationship | Body developed by Pentax; 14.6 MP CMOS sensor made by Samsung |
| Sensor | 14.6 MP effective APS-C CMOS, 23.4 × 15.6 mm (15.1 MP total) |
| Processor | PRIME, 22-bit A/D conversion |
| Mount | Pentax K (KAF2) |
| Viewfinder | Pentaprism, 95 % coverage, 0.95× magnification |
| Autofocus | TTL phase-matching, 11 points |
| Shutter | Electronically controlled vertical-run focal plane, 30 s – 1/4000 s; flash X-sync 1/180 s |
| ISO | Auto, 100–3200; 6400 as a user setting |
| Continuous | 3 fps (9 raw frames per burst) |
| Monitor | 2.7-inch low-temperature polysilicon TFT, ~230,000 pixels, with live view |
| Body | High-impact plastic over a metal sub-structure; sealed at 72 points, dual dust removal |
| RAW format | DNG only — no PEF, unlike the K20D |
| Storage / power | SD / MMC / SDHC; SLB-1674 lithium-ion pack |
| Size / weight | 142 × 101 × 71.5 mm; ~800 g with batteries |
| Shutter durability | No figure published by Samsung or Pentax — commonly estimated at ~100,000 (est.) |
In the Pentax MakerNote, tag 0x005D, as a big-endian four-byte integer XOR-scrambled with the maker note’s own Date (0x0006) and Time (0x0007) tags:
That is ExifTool’s CryptShutterCount. It is not encryption in any protective sense — it is reversible arithmetic — but it does mean the count cannot be recovered without the Date and Time tags from the same maker note, so an original file off the card is required and an export or re-save is not a substitute.
Because the GX-20 writes no PEF, the maker note travels in one of two containers depending on which file you have:
| File from the camera | Where the maker note sits | Container header |
|---|---|---|
| Camera DNG | IFD0 tag 0xC634 (DNGPrivateData) | PENTAX \0 or SAMSUNG\0 |
| Camera JPEG | ExifIFD tag 0x927C (MakerNote) | AOC\0 |
None of that is inferred from the K20D by family resemblance. ExifTool’s Exif.pm carries a condition written specifically for this case, under the comment “Pentax/Samsung models that write AOC maker notes in JPG images”, and its model list names GX10 and GX20 beside the K10D, K20D, K-5, K-7, K-m, K-x, K-r, K100D, K110D, K200D and K2000. The same condition accepts a header of PENTAX \0 or SAMSUNG\0 on the DNG block — ExifTool anticipated the Samsung-badged variant explicitly. ExifTool’s Pentax model table likewise gives the GX-20 its own PentaxModelID, 0x12cd4, one slot along from the K20D at 0x12cd2, the same way it pairs the *ist DL2 (0x12b7e) with the Samsung GX-1L (0x12b80).
ExifTool’s note on tag 0x005D carries two warnings that apply here in full: the value may be reset by servicing, and it excludes actuations from live view and video recording. The GX-20 has live view — it is the headline feature it gained over the GX-10 — so unlike the older AA-powered Pentax bodies, its count is not quite a complete record of everything the camera did. It remains a complete record of what the blades did, which is the number you actually want.
The servicing warning has a companion worth knowing before you read a low number as good news. ExifTool records that the first frame off a brand-new body of this generation read 81, 181, 246 or 209 depending on the copy, because the factory fires test frames before the camera is boxed. A 2008 body showing a few hundred is therefore normal for barely used. One showing 0 or 1 is not “mint” — it points at a replaced or reset shutter unit, and that is a question to ask rather than a bargain to grab.
The count is in your GX-20 file and the tool on this site will not return it. That is a limitation of this parser, not of the camera. Do not drop a GX-20 DNG on the home page and conclude the counter is missing or that the body has been serviced — it tells you nothing either way.
There are two separate reasons, and either one alone is enough to produce a blank result.
This parser decides which decoder sees a file by its EXIF Make string, and the Pentax branch accepts only PENTAX and RICOH. A GX-20 writes a Samsung make — recorded as SAMSUNG TECHWIN Co. with Model = SAMSUNG GX20 — so the file never reaches the Pentax decoder at all, in either the DNG path or the JPEG path.
Where ExifTool accepts PENTAX \0 or SAMSUNG\0 as the header of the DNGPrivateData block, this parser accepts only PENTAX \0, RICOH\0 and AOC\0. If a GX-20 writes the Samsung-flavoured header — and ExifTool’s condition exists precisely because some body does — then even correcting the brand gate would not be enough on its own.
Both were measured on 10 October 2026 by running this site’s own parser against synthetic DNG- and JPEG-shaped structures with a known count of 23,456 planted in 0x005D. The files in each pair differ only in the field named:
| Structure (count planted: 23,456) | EXIF Make | Parser returns |
|---|---|---|
DNG, 0xC634, PENTAX \0 header | PENTAX | 23,456 — exactly the planted value |
DNG, 0xC634, PENTAX \0 header | SAMSUNG TECHWIN Co. | No count |
JPEG, 0x927C, AOC\0 header | PENTAX | 23,456 — exactly the planted value |
JPEG, 0x927C, AOC\0 header | SAMSUNG TECHWIN Co. | No count |
DNG, 0xC634, SAMSUNG\0 header | PENTAX | No count — the second, independent gap |
Closing the first gap is a change to one routing condition and closing the second is a fourth header string — neither is new parsing work. What neither can be done without is a file. No GX-20 or GX-10 file has ever been tested here, none is bundled with this project, and until one is, the position above is documentary where it concerns the camera and measured only where it concerns this code. An untouched GX-20 DNG straight off a card would settle both at once: samples@shuttercount.app.
Use ExifTool, the free open-source metadata reader that defined this decryption. It runs locally, changes nothing in the file, and — this is the point — it matches the Pentax maker note on the block’s own header rather than on the brand on the front of the camera.
.DNG or camera .JPG straight off the card. Not a Lightroom export, not a re-saved copy, not a DNG rebuilt by Adobe DNG Converter.ShutterCount comes back empty, run the second form to see whether a Pentax maker-note group was found at all.The second form is the diagnostic. A [MakerNotes] or [Pentax] group in the output means the maker note was located and parsed; a PentaxModelID of Samsung GX20 confirms the camera identified itself inside the Pentax tables. Nothing at all from an original file points at metadata stripped by an editing round-trip rather than a camera that never wrote the tag — go back to the file as it left the card.
If you also own a Pentax body, the contrast is the clearest demonstration of what this page is about: a K10D, K20D, K-7 or K-5 file reads straight away in the browser here, with no upload and no account, while the Samsung-badged twin of the very same camera comes back blank. Same tag, same scrambling, same number — different four letters in one EXIF field.
Two cameras, one design, and — for anyone chasing a shutter count — two different answers. A listing photograph rarely makes the badge legible; one original file always does.
| Pentax K20D | Samsung GX-20 | |
|---|---|---|
| EXIF Make | PENTAX | SAMSUNG TECHWIN Co. |
| EXIF Model | PENTAX K20D | SAMSUNG GX20 |
ExifTool PentaxModelID | 0x12cd2 | 0x12cd4 |
| RAW format | PEF and DNG | DNG only |
| Last firmware | 1.04 (SDHC to 32 GB) | 1.03 (SDHC to 16 GB); K20D firmware will not install |
| Battery grip | Pentax’s own | Its own — the K20D grip does not fit |
Count in 0x005D | ✓ Yes | ✓ Yes |
| Read by this site | ✓ Yes | ✗ No — use ExifTool |
The firmware row is the one that bites in practice. A GX-20 stopped receiving updates at 1.03 while the K20D went on to 1.04, and the K20D build cannot be flashed onto the Samsung body — so a GX-20 is capped at 16 GB SDHC cards no matter how new the card you buy. That is not a shutter-count question, but it is the kind of thing a seller will not mention.
Neither Samsung nor Pentax published a shutter durability figure for this body. Samsung’s launch material quotes none, and Imaging Resource’s K20D review states plainly that no shutter-life information was available for the Pentax twin either, inferring its number from the earlier K10D. The ~100,000 attached to these cameras across the web is therefore an estimate — part class norm for a 2008 enthusiast DSLR, part borrowed sideways from the K10D, which does carry a published rating. Read the table below as a yardstick against that estimate, not a countdown against a warranty.
| Actuation count | Share of the ~100,000 estimate | Assessment |
|---|---|---|
| Under 5,000 | under 5 % | Barely used — but check it is not a reset or replaced unit |
| 5,000 – 25,000 | 5 – 25 % | Light use; the shutter is not the thing to worry about on this body |
| 25,000 – 60,000 | 25 – 60 % | Genuinely used, and unremarkable for a camera of this age |
| Over 60,000 | over 60 % | Heavy — price it as a body whose shutter unit is not economically replaceable |
Keep the last row in proportion. Samsung left the camera business in 2016 and there is no authorised service for a GX-20 anywhere; a shutter unit for one would have to come from a donor body or from the Pentax parts bin by way of an independent repairer, and either way it costs more than the camera is worth. A high count here is a reason to pay less or walk away, not a repair plan.
On a seventeen-year-old body, several things are more likely to end its life than the shutter:
And one that is specific to a rebadge: whatever paperwork once came with a GX-20 belongs to a distributor that no longer sells cameras. The file is the only service record you are going to get, which is exactly why it is worth the exiftool command before you pay.
Every camera below stores its actuation total the same way — Pentax MakerNote tag 0x005D, the same XOR of Date and Time. What differs is the brand string in the file, and that is the whole of the difference this site is currently sensitive to.
| Body | Year | Twin | Read by this site |
|---|---|---|---|
| Pentax K10D | 2006 | Samsung GX-10 | ✓ Yes |
| Samsung GX-10 | 2006 | Pentax K10D | ✗ No — ExifTool |
| Pentax K20D | 2008 | Samsung GX-20 | ✓ Yes |
| Samsung GX-20 | 2008 | Pentax K20D | ✗ No — ExifTool |
| Pentax *ist DL2 | 2006 | Samsung GX-1L | ✓ Yes |
| Pentax *ist DS2 | 2005 | Samsung GX-1S | ✓ Yes |
Other Pentax and Ricoh bodies that answer in the browser, no caveats attached:
If you are shopping this generation rather than committed to the Samsung badge, the K20D is the same camera with a format more tooling understands, a firmware that reached 1.04, and a count this site reads in the browser.
No. The number is in the file and this browser tool still returns nothing — a gap in the parser, not in the camera. Drop a GX-20 DNG on the home page and you get the model and the capture data with no count. Use exiftool -ShutterCount -Make -Model yourfile.DNG instead. The identical Pentax K20D does read here, which is exactly why this needs saying rather than leaving a blank result to be interpreted.
Two independent reasons, both measured on 10 October 2026 rather than assumed. The parser routes files to its Pentax decoder by the EXIF Make string and accepts only PENTAX and RICOH; a GX-20 says Samsung. And where ExifTool accepts a PENTAX \0 or a SAMSUNG\0 header on the DNG block that holds the maker note, this parser accepts only the first. Two files differing in nothing but their make strings, with 23,456 planted in 0x005D, returned 23456 and no count respectively.
Pentax MakerNote tag 0x005D, a big-endian four-byte value XOR-scrambled with the maker note’s own Date (0x0006) and Time (0x0007) tags. In a camera DNG the maker note sits inside DNGPrivateData (tag 0xC634); in a camera JPEG it sits in the ordinary MakerNote tag 0x927C behind an AOC\0 header. ExifTool names GX10 and GX20 explicitly in the condition that handles the DNG case.
Nothing published. Samsung quoted no durability figure, and Pentax quoted none for the K20D either — Imaging Resource’s review says the information was simply not available and infers a number from the K10D. The ~100,000 in circulation is an estimate, which is why it is flagged as one here and kept out of this page’s description. Any page handing you an exact rated figure for a GX-20 is presenting a guess as a specification.
Nearly. Pentax developed the body, Samsung made the sensor, and the two were announced together on 23 January 2008. They differ in button shape and lettering, grip shape, firmware and JPEG processing, and the K20D’s battery grip does not fit. The difference that matters to metadata is that the GX-20 writes DNG only, with no PEF, and identifies itself as a Samsung in every file.
No. The counter lives in the camera body and formatting a card cannot touch it. What resets is DCF file numbering, so a filename like SAM_0042.DNG tells you nothing about wear. ExifTool’s notes add two real caveats: the value may be reset by servicing, and it excludes live-view actuations — and this body does have live view, so heavy live-view use means fewer mechanical cycles than total frames.
The announcement of 23 January 2008 alongside the Pentax K20D, the Pentax–Samsung Techwin partnership under which Pentax developed the body and Samsung manufactured the shared 14.6 MP CMOS sensor, the list of real differences between the two cameras (button lettering and shape, grip shape, separate firmware and JPEG processing, a battery grip that is not interchangeable), the fact that the GX-20 does not support Pentax’s PEF format and writes Adobe DNG instead, and the firmware history — Samsung stopping at 1.03 with a 16 GB SDHC ceiling while the K20D went on to 1.04 with 32 GB, and K20D firmware being uninstallable on the GX-20 — are recorded in the Samsung GX-20 and Pentax K20D entries. The launch specifications — 14.6 MP effective / 15.1 MP total 23.4 × 15.6 mm CMOS, PRIME processor with 22-bit A/D, ISO 100–3200 with 6400 as a user setting, electronically controlled vertical-run focal-plane shutter with 1/180 s flash X-sync, 11-point TTL phase-matching AF, 3 fps for 9 raw frames, 2.7-inch ~230,000-pixel TFT with live view, high-impact plastic over a metal sub-structure sealed at 72 points with dual dust removal, SD/MMC/SDHC storage, the SLB-1674 pack and 142 × 101 × 71.5 mm — come from the DPReview GX-20 press release of 24 January 2008, with the 30 s – 1/4000 s shutter range, the pentaprism finder at 95 % coverage and 0.95×, ~800 g with batteries and the 3 fps figure from the DPReview GX-20 specification sheet. Neither that press release nor any Samsung or Pentax material quotes a shutter durability or cycle-life rating for this body; Imaging Resource’s Pentax K20D review states that no shutter-life information was available for the twin and infers a figure from the K10D — which is why the ~100,000 on this page is labelled an estimate and kept out of the page description. That the earlier Samsung GX-10 was announced on 21 September 2006 as the rebadge of the Pentax K10D, and that it too offers only a DNG raw mode where the Pentax offers DNG and PEF, is recorded in that entry. That the GX-20 was the last K-mount DSLR Samsung sold, that the rumoured GX-30 was never released, and that Samsung restarted with the NX system and the NX10 in 2010 is recorded by Camera-wiki. The GX-20’s EXIF identity — Make = SAMSUNG TECHWIN Co., Model = SAMSUNG GX20 — is the Exif make and model recorded on Wikidata. The metadata facts — that tag 0x005D is “used by all Pentax DSLR’s except *istD and *istDS until firmware 2.0”, the CryptShutterCount formula, the reset-by-servicing and live-view warnings, the 81 / 181 / 246 / 209 factory-test starting values observed on new bodies of this generation, and the PentaxModelID values separating the K10D (0x12c1e), Samsung GX10 (0x12c20), K20D (0x12cd2) and Samsung GX20 (0x12cd4) — are documented in ExifTool’s Pentax.pm, with the DNGPrivateData condition naming “Pentax/Samsung models that write AOC maker notes in JPG images … K10D, K20D … GX10, GX20” and accepting a /^(PENTAX |SAMSUNG)\0/ header in Exif.pm (tag 0xc634), the brand-independent AOC\0 maker-note dispatch with its note that the format is “also used by some Samsung models” in MakerNotes.pm, and the published Pentax tag names. Which formats this site’s parser decodes and the “not yet validated on a full release corpus” caveat it still carries for Pentax: the support matrix and validation report on the ShutterCount home page. The brand-gate and container-header results on this page were produced on 10 October 2026 by running this site’s own parser against synthetic DNG- and JPEG-shaped structures with 23,456 planted in 0x005D, each pair differing only in the one field named. No Samsung GX-20 or GX-10 file has been tested — none is bundled with the project — so the position on the camera itself is documentary, taken from ExifTool’s tables, and only the behaviour of this parser is measured.