SX-70 ND Filter strength

<p>does anyone know what the strength of the little ND filter is that you can get to stick over a Polaroid SX-70 lens? Want to know if it's suitable for another project.<br>

Thanks, Laurence</p>

<p>I know some Polaroids came with a filter for shooting 3000 speed film in daylight. I think they converted 3000 to 100, so that would be 5 stops. I'm not sure of the filter you are talking about, but if it's virtually black, that's probably the one.</p>

<p>Thanks Patrick but I think that might be too strong. The one I'm talking about allows you to use 600 film in the SX-70.<br /> Here's one: http://www.polapremium.com/shop/accessories/ac_ndfilter<br>

... although it does say "600 film is about 5 times as light-sensitive (=fast) as original SX-70 film" in the specs.</p>

<p>The "70" in SX-70 stands for the film speed... so to get the number of stops you need to count the stops from 70 to 600. 70, 140, 280, 560. That's 3 stops. "5 times as light-sensitive" is a rather non-sensical statement along the lines of "5X zoom lens" that sounds like marketing more than tech. ;)</p>

<p>Excellent, thanks Patrick.</p>