Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
04-23-2010, 11:34 PM   #1
New Member




Join Date: Apr 2010
Location: Delhi
Photos: Albums
Posts: 22
Why can't DSLR's have DOF Calculators?

Hi When all the information required for calculating DOF is there on a DSLR screen, why can;t the equipment calculate and show it on the screen itself?

I am sure is just a small calculation software that needs to be added...hope manufacturers will update their firmwares for it!!

04-24-2010, 01:12 AM   #2
Veteran Member




Join Date: Sep 2006
Photos: Gallery
Posts: 5,713
Since this is the film forum my guess is that you posted in the wrong section.

However, once you start using the preview button you'll never go back to some calculations.
You can pretty much see the effects happening before your eyes.
04-24-2010, 01:48 AM   #3
Site Supporter
Sluggo's Avatar

Join Date: Sep 2006
Location: Ames, Iowa
Photos: Gallery | Albums
Posts: 540
What laker^ said. The whole DSLR paradigm revolves around chimping, though DOF calculations could be displayed if enough people thought it was a useful feature to convince manufacturers.

But a requirement for that is for the camera to be aware of the focal length. On a Pentax DSLR, that depends on the lens - many of the lenses that I use, at least, don't identify themselves to the camera. In fact because I mostly shoot M-series lenses and Pentax DSLRs have the "crippled" lens mounts, my camera doesn't even know what aperture it is shooting. So such a feature could not be made to work for me.
04-24-2010, 07:15 AM   #4
Senior Member
summonbaka's Avatar

Join Date: Dec 2009
Location: Kagoshima, Japan
Photos: Gallery | Albums
Posts: 237
You're also forgetting that there would be a need for that space in the viewfinder. DSLR viewfinders are small enough as it is, we don't need them being even smaller.
BUT, in live preview it would be possible to implement. Not that it would be too useful since you already see your depth of field and OOF areas in the screen.

It could apear in the exif tags, though. That might be nice.

04-24-2010, 12:37 PM   #5
Site Supporter
GeneV's Avatar

Join Date: Oct 2008
Location: Albuquerque NM
Photos: Albums
Posts: 9,761
QuoteOriginally posted by Sluggo Quote
What laker^ said. The whole DSLR paradigm revolves around chimping, though DOF calculations could be displayed if enough people thought it was a useful feature to convince manufacturers.

But a requirement for that is for the camera to be aware of the focal length. On a Pentax DSLR, that depends on the lens - many of the lenses that I use, at least, don't identify themselves to the camera. In fact because I mostly shoot M-series lenses and Pentax DSLRs have the "crippled" lens mounts, my camera doesn't even know what aperture it is shooting. So such a feature could not be made to work for me.
Generally, the camera does not seem to have a problem with the focal length, but it does not know the lens make or model. It needs to know the focal length for the shake reduction.
04-24-2010, 06:27 PM   #6
Veteran Member
Mike Cash's Avatar

Join Date: Jan 2007
Location: Japan
Photos: Gallery
Posts: 6,952
Of course, they could go back to this:



except that it probably confuses and intimidates people who don't know what the hell it is.

Maybe we could just go straight to mounting robotic legs on the cameras so they can just go out and do every goddamned thing about the process and we can sit home.

Last edited by Mike Cash; 04-24-2010 at 07:55 PM.
04-24-2010, 07:35 PM   #7
Site Supporter
Sluggo's Avatar

Join Date: Sep 2006
Location: Ames, Iowa
Photos: Gallery | Albums
Posts: 540
QuoteOriginally posted by GeneV Quote
Generally, the camera does not seem to have a problem with the focal length, but it does not know the lens make or model. It needs to know the focal length for the shake reduction.
Right, I didn't think of that. The focal length input is even available with K- and M- lenses.

QuoteOriginally posted by Mike Cash Quote
Maybe we could just go straight to mounting robotic legs on the cameras so they can't just go out and do every goddamned thing about the process and we can sit home.
shakes Mike's hand
04-24-2010, 08:59 PM   #8
Veteran Member




Join Date: Nov 2007
Location: In the present
Photos: Gallery
Posts: 1,870
QuoteOriginally posted by Mike Cash Quote
Of course, they could go back to this:
My thought exactly.

Nah. Too much work. Your second idea was better I suppose.

woof!

04-25-2010, 10:22 AM   #9
Pentaxian
titrisol's Avatar

Join Date: Dec 2007
Location: In the most populated state... state of denial
Photos: Gallery | Albums
Posts: 1,094
THere are not f/rings anymore.... this would be a de-luxe feature
QuoteOriginally posted by woof Quote
My thought exactly.

Nah. Too much work. Your second idea was better I suppose.

woof!
04-25-2010, 10:36 AM   #10
Site Supporter
GeneV's Avatar

Join Date: Oct 2008
Location: Albuquerque NM
Photos: Albums
Posts: 9,761
QuoteOriginally posted by woof Quote
My thought exactly.

Nah. Too much work. Your second idea was better I suppose.

woof!
I'd settle just for the aperture ring.
04-26-2010, 06:44 PM   #11
Pentaxian




Join Date: Jul 2009
Location: Seattle
Posts: 6,929
QuoteOriginally posted by Mike Cash Quote
except that it probably confuses and intimidates people who don't know what the hell it is.

Maybe we could just go straight to mounting robotic legs on the cameras so they can just go out and do every goddamned thing about the process and we can sit home.
Well, those fancy digital cameras STILL have not implemented a composition error light in the HUD. When they finally add that, people will wonder how anyone ever go by without it.
04-27-2010, 10:11 AM   #12
Senior Member
summonbaka's Avatar

Join Date: Dec 2009
Location: Kagoshima, Japan
Photos: Gallery | Albums
Posts: 237
I imagine now:
QuoteQuote:
"Your image is not nicely composed, please move 10 meters to the left and 4 to the back. Acording to the map, there's a rock ridge there so you'll need a sturdier tripod and a shorter lens."
In a sharp robotic voice.
04-27-2010, 05:26 PM   #13
Veteran Member




Join Date: Nov 2007
Location: In the present
Photos: Gallery
Posts: 1,870
QuoteOriginally posted by titrisol Quote
THere are not f/rings anymore.... this would be a de-luxe feature
QuoteOriginally posted by GeneV Quote
I'd settle just for the aperture ring.
There are aperture rings and scales on MANUAL lenses.

That's just what I meant about too much work... too much work manually focusing, too much work looking at the scales, too much work learning how to use the scales, too much work buying manual lenses.

Pwew! This photography! Too much work!

Hell, apparently for the OP it is too much work flicking the DOF preview and LOOKING at the DOF... heh... No we'd rather take some calculator's word for it. Do you know that many folks these days do not know their multiplication tables? Know why? Too much WORK!

That's why Mike's damn robots are so appealing.

QuoteOriginally posted by tuco Quote
Well, those fancy digital cameras STILL have not implemented a composition error light in the HUD. When they finally add that, people will wonder how anyone ever go by without it.
LOL...

QuoteOriginally posted by summonbaka Quote
I imagine now:
"Your image is not nicely composed, please move 10 meters to the left and 4 to the back. Acording to the map, there's a rock ridge there so you'll need a sturdier tripod and a shorter lens."
In a sharp robotic voice.
ROTFLMAO...

And let's add GPS, so that the "please move 10 meters" scenario is actually practicable. Then we can take this all to the ultimate expression. All we have to do is see what lovely photos others have taken, upload the photos to our cameras so they can get the coordinates; at that point, our cameras will help us navigate to the exact spot. We won't have to be concerned with any composition because we'll KNOW it is nice. After all, we will have already seen the result!

Yes?

We won't even have to guess what lens to use, and we certainly don't have to be concerned with aperture or other settings. Heck even the time of day will be there.

An open book! It's all there in the exif and our cameras will read it, take us there, set themselves, and viola! A perfect clone of something someone else did. But very little work! No creativity wasted here. Don't have any. Even better!

Why even LEARN about cameras or photography? Taking picture should be... like... using a phone.

Yes... TOO MUCH WORK!

It used to be "f/8 and be there"... now it will be "triangulate and take it."

QuoteQuote:
I am sure is just a small calculation software that needs to be added...hope manufacturers will update their firmwares for it!!
Be careful for what you wish. I am sure it IS a simple calculation! Maybe Pentax will outsource this! That would suck! Too much work...

woof!

Last edited by woof; 04-27-2010 at 05:33 PM.
04-27-2010, 06:09 PM   #14
Site Supporter
GeneV's Avatar

Join Date: Oct 2008
Location: Albuquerque NM
Photos: Albums
Posts: 9,761
QuoteOriginally posted by woof Quote
There are aperture rings and scales on MANUAL lenses.

That's just what I meant about too much work... too much work manually focusing, too much work looking at the scales, too much work learning how to use the scales, too much work buying manual lenses.
On a lot of AF lenses, too, until the DA series. Backward compatibility is a nice thing, IMHO.
04-29-2010, 06:43 PM   #15
Forum Member




Join Date: Sep 2007
Location: Bronson, Missouri
Posts: 72
Back to the OP's question, I suspect that the reason is because lenses don't have encoders to tell the camera what absolute distance they are focused at. So the camera can't calculate the near and far limits (assuming they gave you a way to choose your circle of confusion in the config settings).

Theoretically they could put in an app that would let you manually enter your estimated distance and then calculate a d.o.f. range based on your current focal length and aperture and display it on the rear LCD. Maybe it's just too old school for them to put any effort into it.
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
dof, screen
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
New to DSLR's MitchellScott Troubleshooting and Beginner Help 16 04-30-2010 12:05 PM
New to DSLR's Maishy Welcomes and Introductions 4 02-22-2010 03:04 AM
New to dslr's teatma Welcomes and Introductions 3 02-19-2010 05:05 AM
New to DSLR's and photography...K-X on the way! asdfTT123 Troubleshooting and Beginner Help 5 02-16-2010 01:38 PM
DSLR's just keep getting better and better whitedogone Pentax DSLR Discussion 13 06-24-2008 09:05 AM



All times are GMT -7. The time now is 03:40 AM. | See also: NikonForums.com, part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top