ISO question

dawsonscholz · 05-20-2010, 05:02 PM

On my pentax Me it says I can have an ISO of 12. Where do I find film like this? The lowest I can find is 50. And what would ISO 12 be compared to in mega pixels?

Adam · 05-20-2010, 05:10 PM

You can't convert ISO (sensitivity) to megapixels (resolution). ISO 12 on a DSLR would be...ISO 12!

AFAIK low-ISO films like that aren't really around much anymore, not that they were to begin with. They aren't all too useful, either, as ISO 12 would barely let you hand-hold anything.

stevebrot · 05-20-2010, 05:13 PM

Originally posted by dawsonscholz

On my pentax Me it says I can have an ISO of 12. Where do I find film like this? The lowest I can find is 50. And what would ISO 12 be compared to in mega pixels?

Ummmm...ISO vs. megapixels?

I think I will leave this one to the experts...

In regards to the first part of your inquiry, slow films in that range were available at one time, though the slowest I have ever personally shot was ISO/ASA 25. You can still get Adox CMS 20 at Freestyle, I think.

Steve

**gofour3** · 05-20-2010, 05:25 PM

Yes as far as I know the Adox CMS 20 ISO is the slowest film you can buy.

Phil.

stevebrot · 05-20-2010, 05:37 PM

I almost forgot...the old K-11 process Kodachrome was ASA 12...

Steve

(Before my time of course...)

JeffJS · 05-20-2010, 09:17 PM

Originally posted by dawsonscholz

On my pentax Me it says I can have an ISO of 12. Where do I find film like this?

The short answer is you can't. Not readily available anyway. You Might find something on ebay but it will be so old that it's likely unusable.

What you Can do with it however is put ASA25 film in the camera, and Tell the camera it's ASA12 to change the metering characteristic for exposure compensation. Unless you are processing your own film though, it would be rather pointless to do it.

tuco · 05-20-2010, 09:31 PM

I've shot some efke IR820 film with an R72, IR filter at ISO 3.

titrisol · 05-21-2010, 12:54 AM

Rollei ATP TechPan replacement is EI20-32
Efke/Adox 25
Microfilm

EyeSpy · 05-21-2010, 07:59 AM

Originally posted by tuco

I've shot some efke IR820 film with an R72, IR filter at ISO 3.

How did that turn out? With the shots you've been posting I'm assuming pretty good.

tuco · 05-21-2010, 09:07 AM

Originally posted by EyeSpy

How did that turn out? With the shots you've been posting I'm assuming pretty good.

The film is somewhat curly. Assessing the negatives requires more shooting (I've only shot two rolls so far) but they look okay. And with most IR films, its good to bracket but I didn't do any of that. When I get around to shooting it on a better camera, I'll have a better assessment.

This and the others were shot on a Holga. Most shots were 1 and more seconds on bulb since the camera only has one shutter speed. I was mostly curious and trying out the film. Here is an example:

Holga 120N Toy Camera, efke IR820 @ EI3, R72 filter, Rodinal 1+50 @ 11:00 min

spystyle · 05-25-2010, 11:28 AM

Tuco is a cool mad scientist

05-20-2010, 05:02 PM	#1
dawsonscholz New Member Join Date: May 2010 Location: Idaho Posts: 4	ISO question On my pentax Me it says I can have an ISO of 12. Where do I find film like this? The lowest I can find is 50. And what would ISO 12 be compared to in mega pixels?

05-20-2010, 05:10 PM	#2
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,593	You can't convert ISO (sensitivity) to megapixels (resolution). ISO 12 on a DSLR would be...ISO 12! AFAIK low-ISO films like that aren't really around much anymore, not that they were to begin with. They aren't all too useful, either, as ISO 12 would barely let you hand-hold anything. Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

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05-20-2010, 05:13 PM	#3
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by dawsonscholz On my pentax Me it says I can have an ISO of 12. Where do I find film like this? The lowest I can find is 50. And what would ISO 12 be compared to in mega pixels? Ummmm...ISO vs. megapixels? I think I will leave this one to the experts... In regards to the first part of your inquiry, slow films in that range were available at one time, though the slowest I have ever personally shot was ISO/ASA 25. You can still get Adox CMS 20 at Freestyle, I think. Steve

05-20-2010, 05:25 PM	#4
gofour3 Site Supporter Join Date: Oct 2008 Location: Vancouver, Canada Posts: 8,088	Yes as far as I know the Adox CMS 20 ISO is the slowest film you can buy. Phil.

05-20-2010, 05:37 PM	#5
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	I almost forgot...the old K-11 process Kodachrome was ASA 12... Steve (Before my time of course...)

05-20-2010, 09:17 PM	#6
JeffJS Inactive Account Join Date: Aug 2008 Location: Michigan, USA Photos: Gallery \| Albums Posts: 7,484	Originally posted by dawsonscholz On my pentax Me it says I can have an ISO of 12. Where do I find film like this? The short answer is you can't. Not readily available anyway. You Might find something on ebay but it will be so old that it's likely unusable. What you Can do with it however is put ASA25 film in the camera, and Tell the camera it's ASA12 to change the metering characteristic for exposure compensation. Unless you are processing your own film though, it would be rather pointless to do it.

05-20-2010, 09:31 PM	#7
tuco Pentaxian Join Date: Jul 2009 Location: Pugetopolis Posts: 11,019	I've shot some efke IR820 film with an R72, IR filter at ISO 3.

05-21-2010, 12:54 AM	#8
titrisol Pentaxian Join Date: Dec 2007 Location: In the most populated state... state of denial Photos: Gallery \| Albums Posts: 1,851	Rollei ATP TechPan replacement is EI20-32 Efke/Adox 25 Microfilm

05-21-2010, 07:59 AM	#9
EyeSpy Veteran Member Join Date: Feb 2010 Location: Arizona Photos: Albums Posts: 663	Originally posted by tuco I've shot some efke IR820 film with an R72, IR filter at ISO 3. How did that turn out? With the shots you've been posting I'm assuming pretty good.

05-21-2010, 09:07 AM	#10
tuco Pentaxian Join Date: Jul 2009 Location: Pugetopolis Posts: 11,019	Originally posted by EyeSpy How did that turn out? With the shots you've been posting I'm assuming pretty good. The film is somewhat curly. Assessing the negatives requires more shooting (I've only shot two rolls so far) but they look okay. And with most IR films, its good to bracket but I didn't do any of that. When I get around to shooting it on a better camera, I'll have a better assessment. This and the others were shot on a Holga. Most shots were 1 and more seconds on bulb since the camera only has one shutter speed. I was mostly curious and trying out the film. Here is an example: Holga 120N Toy Camera, efke IR820 @ EI3, R72 filter, Rodinal 1+50 @ 11:00 min

05-25-2010, 11:28 AM	#11
spystyle Veteran Member Join Date: Mar 2009 Location: Maine, USA Posts: 424	Tuco is a cool mad scientist

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