pef vs dng

Thibouille pentaxlist at
Wed Oct 7 03:09:30 EDT 2009

K10D and K20D will produce bigger DNG than PEFs.

K-7 (and K-x I suppose) will compress DNG so size is the same (a few
bytes apart).
Of course you can convert your PEFs to DNG on PC as others have
pointed out already.

On Wed, Oct 7, 2009 at 8:21 AM, Fernando <fer.pdml at> wrote:
> I have a K10D and K20D in both cases DNG is larger than a PEF and
> that's relevant to me -might they be double size, 75% more or other %-
> ~in the cameras I own~ DNG is still considerably larger. I have a
> preference on a raw converter, and that raw converter supports PEF
> better than DNG.
> Can we agree that in the cameras I own, DNG files are larger than PEF
> files and that if Capture One is the raw converter of choice DNG is
> not the best option?
> On Wed, Oct 7, 2009 at 1:42 AM, John Francis <johnf at> wrote:
>> On Wed, Oct 07, 2009 at 01:16:58AM -0400, Fernando wrote:
>>> On Wed, Oct 7, 2009 at 12:10 AM, John Francis <johnf at> wrote:
>>> > Heck, it wouldn't be that difficult to write a DNG-to-(PEF/NEF/CRW/Whatever)
>>> > converter, if it were necessary.
>>> There is nothing out there today that can do that. I can convert all
>>> my PEFs to DNG tomorrow if I want to
>> That, in itself, should tell you something.
>> If it were worthwhile, somebody would do it.
>>> >As I've said before, there's nothing in a
>>> > PEF that isn't in a DNG file.
>>> Not every one agrees on that
>> Believe what you like.  The facts are as I stated.
>> I know - I've written software to pull apart PEFs,
>> and to compare the contents with the contents of DNGs.
>> I can't speak for other formats (NEF, CRW, etc.), but I
>> can indeed state that DNGs contain everything from PEFs.
>> In fact the MakerNote tag - the repository for all the
>> Pentax-private data - is copied over bit-for-bit.
>> And I wouldn't exactly call a disinterested
>> party, either - they have their own agenda, and seem to be
>> more interested in badmouthing Adobe than in anything else.
>> Despite Adobe's long history with maintaining the TIFF standard,
>> and in direct contradiction to what Adobe have publicly stated
>> about the DNG standard, they continue to tilt at the windmill
>> of DNG being "a proprietary standard, owned by Adobe".
>>> If you don't care about other raw converters that's fine ~that's what
>>> you have to weight, and that's why is a personal decision~ If you
>>> prefer Lightroom, and you think that's all you need today and in the
>>> future, and you are confident that DNG keeps all data that is in PEF,
>>> and you don't care about halving your card storage, and you don't care
>>> about hard drive space or running processes to compress DNGs, then
>>> fine, go with DNG.
>> You don't make your point any more convincing by exaggerating, either.
>> Even on a K10D, a PEF isn't half the size of a DNG.  With the advent
>> of compressed DNGs on the K-7 the issue becomes moot.
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Thibault Massart aka Thibouille
Photo: K10D,Z1,SuperA,KX,MX, P30t and KR-10x ;) ...
Thinkpad: X23+UB,X60+UB
Programing: D7 user (trying out D2007)

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