ASA and ND filter factor at DVinfo.net

Andy Krakz · July 18th, 2003, 10:04 PM

Has anyone rated the ASA for the PD-150? Also, do you know how many stops to compensate for the built-in ND filters (are they the same as a .3 or .6 ND?)

Tom Hardwick · July 22nd, 2003, 02:56 PM

it's so easy to check Andy. You can put the PD alongside any 35mm SLR to give you the ASA rating. And the ND filter factor? Use the exposure button to give you an aperture reading. Switch to ND1 and push exposure again. New reading will show you how much light has been absorbed. Ditto for ND2.

tom.

Andy Krakz · July 23rd, 2003, 01:41 AM

Tom,
Okay, I understand the ND problem, but could you clarify about the ASA reading, I"m not sure what a 35mm SLR is. I'm leaving to shoot a documentary in Africa in a couple of days, so a speedy reply would be appreciated. Thanks

Tom Hardwick · July 23rd, 2003, 02:37 AM

It could be that you're not a native English speaker Andy but for someone who's leaving to shoot a documentary in Africa in a couple of days you should brush up on what a 35mm SLR is. 35mm film is something you're aware of? And the single lens reflex type of camera, where you can interchange the lens?

Set both cameras up looking at the same scene - the same grey card if possible. Now go to your 150. Set the default 1/60th shutter speed and note the aperture that gives the correct exposure. Let's say it's f5.6.

Now set the SLR's shutter speed to 1/60th sec and alter the ISO (ASA) film sped setting so that the aperture readout gives correct exposure at f5.6 for the card. Voila - you've determined the ISO factor of the 150. It's probably in the region of 320 ISO.

tom.

July 18th, 2003, 10:04 PM	#1
Andy Krakz Tourist Join Date: Jul 2003 Location: Austin, TX Posts: 2	ASA and ND filter factor Has anyone rated the ASA for the PD-150? Also, do you know how many stops to compensate for the built-in ND filters (are they the same as a .3 or .6 ND?)

July 23rd, 2003, 01:41 AM	#3
Andy Krakz Tourist Join Date: Jul 2003 Location: Austin, TX Posts: 2	35mm SLR? Tom, Okay, I understand the ND problem, but could you clarify about the ASA reading, I"m not sure what a 35mm SLR is. I'm leaving to shoot a documentary in Africa in a couple of days, so a speedy reply would be appreciated. Thanks

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July 22nd, 2003, 02:56 PM	#2
Tom Hardwick Inner Circle Join Date: Mar 2003 Location: Billericay, England UK Posts: 4,711	it's so easy to check Andy. You can put the PD alongside any 35mm SLR to give you the ASA rating. And the ND filter factor? Use the exposure button to give you an aperture reading. Switch to ND1 and push exposure again. New reading will show you how much light has been absorbed. Ditto for ND2. tom.

July 23rd, 2003, 02:37 AM	#4
Tom Hardwick Inner Circle Join Date: Mar 2003 Location: Billericay, England UK Posts: 4,711	It could be that you're not a native English speaker Andy but for someone who's leaving to shoot a documentary in Africa in a couple of days you should brush up on what a 35mm SLR is. 35mm film is something you're aware of? And the single lens reflex type of camera, where you can interchange the lens? Set both cameras up looking at the same scene - the same grey card if possible. Now go to your 150. Set the default 1/60th shutter speed and note the aperture that gives the correct exposure. Let's say it's f5.6. Now set the SLR's shutter speed to 1/60th sec and alter the ISO (ASA) film sped setting so that the aperture readout gives correct exposure at f5.6 for the card. Voila - you've determined the ISO factor of the 150. It's probably in the region of 320 ISO. tom.