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I'm sure this has been asked before but if any one knows the hard data
can you please answer this question, I'm just curious to know the
answer. Approximately how many mp's would a DC need to match the
resolution of a 4x5 neg film camera?

Codex wrote:
>
> I'm sure this has been asked before

right.

codex, meet google.com
google.com, meet codex

<http://www.google.com/search?hl=en&q=4x5+film+megapixels&btnG=Google+Sea rch>

> but if any one knows the hard data
> can you please answer this question, I'm just curious to know the
> answer. Approximately how many mp's would a DC need to match the
> resolution of a 4x5 neg film camera?

On Thu, 28 Apr 2005 23:15:20 -0700, Crownfield <>
wrote:


>right.
>
>codex, meet google.com
>google.com, meet codex

Yes, I've met google.com before but it's more fun asking on usenet.
Just making conversation, you know?

><http://www.google.com/search?hl=en&q=4x5+film+megapixels&btnG=Google+Sea rch>

Now you've spoiled my fun. The answer is more than 200mp's. This
thread is done. Thanks.

"Codex" <> wrote in message
news:...
> On Thu, 28 Apr 2005 23:15:20 -0700, Crownfield <>
> wrote:
>
>
>>right.
>>
>>codex, meet google.com
>>google.com, meet codex
>
> Yes, I've met google.com before but it's more fun asking on usenet.
> Just making conversation, you know?
>
>><http://www.google.com/search?hl=en&q=4x5+film+megapixels&btnG=Google+Sea rch>
>
> Now you've spoiled my fun. The answer is more than 200mp's. This
> thread is done. Thanks.

Ya. -According to SOMEONE...
The answer is entirely debatable.

Codex wrote:
> I'm sure this has been asked before but if any one knows the hard
data
> can you please answer this question, I'm just curious to know the
> answer. Approximately how many mp's would a DC need to match the
> resolution of a 4x5 neg film camera?

In french, this kind of question is called a "troll" (a scandinavian
name for, somehow, nagging spirits), is there a similar word in
english?

But I'll answer you on the basis of Norman Koren data (see
http://www.normankoren.com/Tutorials/MTF7.html ), who states that it
takes around 100pixel by mm (ie 3600*2400px for 24*36) to have the same
resolution as a scanned Provia100, that I find realistic (even
pessimistic, because it does only consider resolution, not noise).

Applied to 4*5" = 100*125mm, that rule of thumb would make
10.000*12.500 = 125Mpix. Yes, it's quite a lot.
Given the low loise in a big imaging chip (I assume you don't want a
pocket camera???), you could decrease pixel count a bit, but the answer
would still be "no way under 60Mpix". Still a lot.

Did the troll have enough exercise?
Greetings from France
Nicolas

wrote:

> Codex wrote:
>
>>I'm sure this has been asked before but if any one knows the hard
>
> data
>
>>can you please answer this question, I'm just curious to know the
>>answer. Approximately how many mp's would a DC need to match the
>>resolution of a 4x5 neg film camera?
>
>
> In french, this kind of question is called a "troll" (a scandinavian
> name for, somehow, nagging spirits), is there a similar word in
> english?
>
> But I'll answer you on the basis of Norman Koren data (see
> http://www.normankoren.com/Tutorials/MTF7.html ), who states that it
> takes around 100pixel by mm (ie 3600*2400px for 24*36) to have the same
> resolution as a scanned Provia100, that I find realistic (even
> pessimistic, because it does only consider resolution, not noise).
>
> Applied to 4*5" = 100*125mm, that rule of thumb would make
> 10.000*12.500 = 125Mpix. Yes, it's quite a lot.
> Given the low loise in a big imaging chip (I assume you don't want a
> pocket camera???), you could decrease pixel count a bit, but the answer
> would still be "no way under 60Mpix". Still a lot.

The signal-to-noise issue is a good one. In noise testing as well
as perception, the signal-to-noise of a DSLR allows improvement
of spatial resolution by on the order of 2x, e.g. by
Richardson-Lucy deconvolution, see:

http://clarkvision.com/imagedetail/image-restoration1

Film megapixel versus digital is film dependent. Fujichrome
Velvia 4x5 is around 200 megapixels, see:

http://www.clarkvision.com/imagedetail/scandetail.html

Here are charts of film versus digital for many films
and formats:

http://www.clarkvision.com/imagedeta...digital.1.html

There are other articles about signal-to-noise, dynamic range,
etc on the site. The effects of signal-to-noise on megapixel
equivalent are discussed in the summary page:

http://www.clarkvision.com/imagedeta....summary1.html

Roger

In article <>,
Codex <> wrote:
>
>
>I'm sure this has been asked before but if any one knows the hard data
>can you please answer this question, I'm just curious to know the
>answer. Approximately how many mp's would a DC need to match the
>resolution of a 4x5 neg film camera?

Don't put the Crown Graphic or the Linhof in the yard sale just yet.

On 29 Apr 2005 03:40:32 -0700, wrote:


>Did the troll have enough exercise?
>Greetings from France
>Nicolas

It wasn't a troll. A real troll said on a forum that 9mp matches 4x5
neg and I called him a bullshitter and thus I turned up here to get
the low down. Is that a troll? No.

On Fri, 29 Apr 2005 17:47:32 GMT, (james)
wrote:


>Don't put the Crown Graphic or the Linhof in the yard sale just yet.
>
>

I don't own one but would like to. Processing costs are expensive
though. I own a Nikon 35mm and an Olympus DC. I don't even have my
darkroom equipment anymore. I used to have a Beseler enlarger with
Nikkor lense that could do 35mm or medium format negs. My kitchen was
my darkroom.

Ask those that make them!
www.betterlight.com
www.phaseone.com

---

Honestly, the way to do it is to ask what resolution do you expect to
image on a 4x5 neg? If it's 50lp/mm (a very decent value for MF), then
you'll get:
4x5" = 102.8mm x 128.5mm by 50lp/mm = 5140 x 6425 pixels digital
equivalent (approximate; ignores nyquest, analog vs. digital, etc.) = 33
Megapixels

Of course, the above two companies do sell high-end MF cameras that top
100 megapixels, so you'll easily find something that'll match your
current analog camera for resolution.