ISO and Shutter Speeds - DPChallenge Forums

01/26/2006 05:31:34 PM · #1

I shoot digital on my D-70 at the lowest ISO, 200. I shoot film at 100 ISO. I usually use the digital to expiriment with the settings, it's cheaper than wasting film. Is there some type of chart that will convert the ISO 200 settings for the ISO 100 film?

DjFenzl

01/26/2006 05:34:31 PM · #2

ISO 200 is 1 stop more sensitive than ISO 100.

kyebosh

Canon EOS-20D

Canon EF 80-200mm f/2.8L

01/26/2006 05:37:39 PM · #3

half the shutter speed (about)

01/26/2006 05:38:34 PM · #4

Originally posted by Megatherian:

ISO 200 is 1 stop more sensitive than ISO 100.

Wow...thats it. That kind of makes it pretty easy to adjust the settings.

01/26/2006 05:41:54 PM · #5

Originally posted by Megatherian:

ISO 200 is 1 stop more sensitive than ISO 100.

With the way digital cameras handle so many odd f/stops I wonder if many folks here actually know what "1 stop more" means anymore. LOL!!

01/26/2006 05:44:41 PM · #6

Okay, for my city shots, I usually do ISO 200, f11 at 13 seconds....what would that translate in to ISO 100 film at f11?

kyebosh

Canon EOS-20D

Canon EF 80-200mm f/2.8L

01/26/2006 05:45:59 PM · #7

25 i think is the closest setting?

01/26/2006 05:47:45 PM · #8

Originally posted by kyebosh:

25 i think is the closest setting?

So I would have to double the exposure time?

DjFenzl

01/26/2006 05:49:36 PM · #9

Originally posted by BADDBOYY21:

Originally posted by kyebosh:
25 i think is the closest setting?

So I would have to double the exposure time?

yep :)

01/26/2006 05:54:29 PM · #10

Originally posted by stdavidson:

Originally posted by Megatherian:
ISO 200 is 1 stop more sensitive than ISO 100.

With the way digital cameras handle so many odd f/stops I wonder if many folks here actually know what "1 stop more" means anymore. LOL!!

Most just work in half or third stops - that isn't really very fine grained. Consider that most light meters work to a tenth of a stop...

01/26/2006 06:03:33 PM · #11

Originally posted by Gordon:

Originally posted by stdavidson:

Originally posted by Megatherian:
ISO 200 is 1 stop more sensitive than ISO 100.

With the way digital cameras handle so many odd f/stops I wonder if many folks here actually know what "1 stop more" means anymore. LOL!!

Most just work in half or third stops - that isn't really very fine grained. Consider that most light meters work to a tenth of a stop...

You are right, of course, but how many people here at DPC actually know that f/8 is one FULL stop different from f/5.6? :)

01/26/2006 06:05:55 PM · #12

Originally posted by stdavidson:

You are right, of course, but how many people here at DPC actually know that f/8 is one FULL stop different from f/5.6? :)

Probably anyone who understands what reciprocity is and how to use it, or has ever tried to do night photography :)

Base exposure is 30 seconds at ISO3200 at f2.8, now what's that at f16, ISO 100 - I seem to be working out that sort of thing any time I'm out at night.

Message edited by author 2006-01-26 18:07:42.

01/26/2006 06:07:35 PM · #13

Originally posted by Gordon:

Probably anyone who understands what reciprocity is and how to use it.

There you go... I rest my case. LOL!!!!

Sigma 18-125mm f/3.5-5.6 DC for Canon

01/26/2006 06:13:08 PM · #14

Originally posted by stdavidson:

Originally posted by Gordon:
Probably anyone who understands what reciprocity is and how to use it.

There you go... I rest my case. LOL!!!!

Okay, maybe anyone who can master their 2-times table. That must cover a few people around here that don't have their brains rolling out of their ears while LOLing all the time.

Kavey

Canon EOS-400D Rebel XTi

01/26/2006 06:54:01 PM · #15

Originally posted by Gordon:

Or learned photography decades ago on a film SLR... :D

01/26/2006 06:59:05 PM · #16

Originally posted by Kavey:

Originally posted by Gordon:

Originally posted by stdavidson:

You are right, of course, but how many people here at DPC actually know that f/8 is one FULL stop different from f/5.6? :)

Probably anyone who understands what reciprocity is and how to use it, or has ever tried to do night photography :)

Or learned photography decades ago on a film SLR... :D

Guilty as charged. Go ahead, Kavita, rub it in... make me feel OLD.

TooCool

Canon EOS-300D Rebel

Canon EF 50mm f/1.8 II

01/26/2006 07:00:43 PM · #17

Originally posted by Gordon:

Originally posted by stdavidson:

You are right, of course, but how many people here at DPC actually know that f/8 is one FULL stop different from f/5.6? :)

Probably anyone who understands what reciprocity is and how to use it, or has ever tried to do night photography :)

Base exposure is 30 seconds at ISO3200 at f2.8, now what's that at f16, ISO 100 - I seem to be working out that sort of thing any time I'm out at night.

12 1/2 minutes?

Edit: More precisely 750 seconds...

Message edited by author 2006-01-26 19:02:00.

Fujifilm XF 18-55mm f/2.8-4 OIS

01/26/2006 07:04:16 PM · #18

Originally posted by TooCool:

Originally posted by Gordon:

Originally posted by stdavidson:

You are right, of course, but how many people here at DPC actually know that f/8 is one FULL stop different from f/5.6? :)

Probably anyone who understands what reciprocity is and how to use it, or has ever tried to do night photography :)

Base exposure is 30 seconds at ISO3200 at f2.8, now what's that at f16, ISO 100 - I seem to be working out that sort of thing any time I'm out at night.

12 1/2 minutes?

Edit: More precisely 750 seconds...

Urm, it's more like 8 and a half hours, but ...

TooCool

Canon EOS-300D Rebel

Canon EF 50mm f/1.8 II

01/26/2006 07:07:42 PM · #19

Originally posted by Gordon:

Originally posted by TooCool:

Originally posted by Gordon:

Originally posted by stdavidson:

You are right, of course, but how many people here at DPC actually know that f/8 is one FULL stop different from f/5.6? :)

Probably anyone who understands what reciprocity is and how to use it, or has ever tried to do night photography :)

Base exposure is 30 seconds at ISO3200 at f2.8, now what's that at f16, ISO 100 - I seem to be working out that sort of thing any time I'm out at night.

12 1/2 minutes?

Edit: More precisely 750 seconds...

Urm, it's more like 8 and a half hours, but ...

I figured it out now. I was multiplin' for each stop instead of doublin'...

docpjv

Fujifilm X-E1

01/26/2006 07:08:29 PM · #20

Just maybe someone will me kind enough to write a small 'THEORETICAL PRINCIPLES of Photography' for the Tutorial section..., pretty please?

Or suggest a theory book I can buy;-)

01/26/2006 07:12:48 PM · #21

Originally posted by TooCool:

Originally posted by Gordon:

Urm, it's more like 8 and a half hours, but ...

I figured it out now. I was multiplin' for each stop instead of doublin'...

It takes a bit of getting used to, but is really handy for night shooting - just take a picture at the highest ISO, wide open, then work out what you actually want to shoot at for the final shot and multiply/ divide by 2 until you get there.

Means you can actually still use the meter in the camera, even in really low light - and when it's going to be exposing for an hour+ it's nice to know you are in the right ballpark :)

Message edited by author 2006-01-26 19:13:41.

01/26/2006 07:14:48 PM · #22

Originally posted by gibun:

Just maybe someone will me kind enough to write a small 'THEORETICAL PRINCIPLES of Photography' for the Tutorial section..., pretty please?

Or suggest a theory book I can buy;-)

Understanding Exposure: by Bryan Peterson, or John Shaw's Nature Photography Field Guide.

Basic Photographic Materials and Processes, Second Edition
by Leslie Stroebel, if you want something significantly more academic and detailed.

Message edited by author 2006-01-26 19:16:16.

wavelength