Re: understanding sensitivity, dynamic range, contrast etc.

2011-04-14 Thread Thibouille
And if you wanna use Bill's idea and really push it (the idea, not Bill), you'd use a 1° spot meter because, really, our Pentax cameras spot meter isn't that spot. It is around 5° or more AFAIR. If you're really too rich, get a Sekonic L758 which you can profile with your DSLR sensor specs (DR

Re: understanding sensitivity, dynamic range, contrast etc.

2011-04-12 Thread Dario Bonazza
Larry Colen wrote: On Apr 11, 2011, at 1:32 PM, Dario Bonazza wrote: The simple answer about extended bracketing with the K-5: Read instruction manual (page 160). It's all there. For me, extended bracketing is nearly useless: When extended bracketing is set, the file format is set to

Re: understanding sensitivity, dynamic range, contrast etc.

2011-04-12 Thread Paul Stenquist
On Apr 12, 2011, at 2:09 AM, Dario Bonazza wrote: Larry Colen wrote: On Apr 11, 2011, at 1:32 PM, Dario Bonazza wrote: The simple answer about extended bracketing with the K-5: Read instruction manual (page 160). It's all there. For me, extended bracketing is nearly useless: When

Re: understanding sensitivity, dynamic range, contrast etc.

2011-04-12 Thread William Robb
On 12/04/2011 12:09 AM, Dario Bonazza wrote: All this thread subset about bracketing other than exposure is pointless then. Shoot RAW, take good care of exposure (bracket in extreme conditions) and you're done. Measure the brightest part of the scene that you want to keep detail in.

Re: understanding sensitivity, dynamic range, contrast etc.

2011-04-11 Thread Larry Colen
On Apr 10, 2011, at 9:46 PM, Christine Aguila wrote: - Original Message - From: Boris Liberman bori...@gmail.com As a matter of side note, I made recently a shot at ISO 6400 in rather dim light. It came out so good that practically I don't think I need bother with ISO any more.

Re: understanding sensitivity, dynamic range, contrast etc.

2011-04-11 Thread Larry Colen
Boris, combining replies It is something that I do hope to experiment with. However, while just trying something to see what happens does have value, I feel that I could do a much better experiment, and get a lot more out of it, if I understood the theory behind what I'm trying. If not,

RE: understanding sensitivity, dynamic range, contrast etc.

2011-04-11 Thread John Sessoms
From: Larry Colen In my typical geeky fashion, I'm trying to wrap my head around all of the ramifications of adjusting sensitivity (ISO) on my camera. Please correct the errors in my understanding. In the simplest form, it is a measure of how many LSBs per photon (or tens, thousands or

Re: understanding sensitivity, dynamic range, contrast etc.

2011-04-11 Thread Larry Colen
On Apr 11, 2011, at 5:05 AM, John Sessoms wrote: From: Larry Colen It seems to me that if we are shooting a low contrast situation, such as clouds on a grey sky, or with a mediocre, low contrast lens, we could compensate by using a higher ISO to spread the fewer stops of dynamic range in

Re: understanding sensitivity, dynamic range, contrast etc.

2011-04-11 Thread Paul Stenquist
On Apr 11, 2011, at 3:59 PM, Larry Colen wrote: On Apr 11, 2011, at 5:05 AM, John Sessoms wrote: From: Larry Colen It seems to me that if we are shooting a low contrast situation, such as clouds on a grey sky, or with a mediocre, low contrast lens, we could compensate by using a

Re: understanding sensitivity, dynamic range, contrast etc.

2011-04-11 Thread Larry Colen
On Apr 11, 2011, at 1:07 PM, Paul Stenquist wrote: On Apr 11, 2011, at 3:59 PM, Larry Colen wrote: On Apr 11, 2011, at 5:05 AM, John Sessoms wrote: From: Larry Colen It seems to me that if we are shooting a low contrast situation, such as clouds on a grey sky, or with a mediocre,

Re: understanding sensitivity, dynamic range, contrast etc.

2011-04-11 Thread Paul Stenquist
On Apr 11, 2011, at 4:16 PM, Larry Colen wrote: On Apr 11, 2011, at 1:07 PM, Paul Stenquist wrote: On Apr 11, 2011, at 3:59 PM, Larry Colen wrote: On Apr 11, 2011, at 5:05 AM, John Sessoms wrote: From: Larry Colen It seems to me that if we are shooting a low contrast

Re: understanding sensitivity, dynamic range, contrast etc.

2011-04-11 Thread Dario Bonazza
The simple answer about extended bracketing with the K-5: Read instruction manual (page 160). It's all there. Dario -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the

Re: understanding sensitivity, dynamic range, contrast etc.

2011-04-11 Thread Larry Colen
On Apr 11, 2011, at 1:32 PM, Dario Bonazza wrote: The simple answer about extended bracketing with the K-5: Read instruction manual (page 160). It's all there. For me, extended bracketing is nearly useless: When extended bracketing is set, the file format is set to [JPEG] and cannot be

Re: understanding sensitivity, dynamic range, contrast etc.

2011-04-11 Thread John Sessoms
From: Larry Colen On Apr 11, 2011, at 5:05 AM, John Sessoms wrote: From: Larry Colen It seems to me that if we are shooting a low contrast situation, such as clouds on a grey sky, or with a mediocre, low contrast lens, we could compensate by using a higher ISO to spread the fewer stops of

understanding sensitivity, dynamic range, contrast etc.

2011-04-10 Thread Larry Colen
In my typical geeky fashion, I'm trying to wrap my head around all of the ramifications of adjusting sensitivity (ISO) on my camera. Please correct the errors in my understanding. In the simplest form, it is a measure of how many LSBs per photon (or tens, thousands or millions of photons). If

Re: understanding sensitivity, dynamic range, contrast etc.

2011-04-10 Thread David Parsons
Larry, Read through this, it may help your understanding (or it may confuse the hell out of you): http://theory.uchicago.edu/~ejm/pix/20d/tests/noise/noise-p3.html#ETTR And the entire document: http://theory.uchicago.edu/~ejm/pix/20d/tests/noise/index.html On Sun, Apr 10, 2011 at 8:27 PM,

Re: understanding sensitivity, dynamic range, contrast etc.

2011-04-10 Thread John Francis
On Sun, Apr 10, 2011 at 05:27:53PM -0700, Larry Colen wrote: In my typical geeky fashion, I'm trying to wrap my head around all of the ramifications of adjusting sensitivity (ISO) on my camera. Please correct the errors in my understanding. In the simplest form, it is a measure of how many

Re: understanding sensitivity, dynamic range, contrast etc.

2011-04-10 Thread Boris Liberman
On Mon, Apr 11, 2011 at 3:27 AM, Larry Colen l...@red4est.com wrote: ... I'm trying to wrap my head around all of the ramifications of ... I most certainly realize that this is a standard figure of speech. Yet, I cannot help but notice that wrapping one's head around things such as these may

Re: understanding sensitivity, dynamic range, contrast etc.

2011-04-10 Thread Christine Aguila
- Original Message - From: Boris Liberman bori...@gmail.com As a matter of side note, I made recently a shot at ISO 6400 in rather dim light. It came out so good that practically I don't think I need bother with ISO any more. Apparently auto ISO setting of 80-6400 was exactly right