Film-Tech Forum ARCHIVE: 4K DLP throw ratio

This is topic 4K DLP throw ratio in forum Digital Cinema Forum at Film-Tech Forum ARCHIVE.

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Posted by Pietro Clarici (Member # 4937) on 03-22-2011, 09:20 AM:

The new 4K DMDs are 1.38" (advertised by OEMs as 1.4"), whereas the "big" 2K chips were 1.25". However, the same lenses are used.

Am I correct in assuming that this increase of approximately 12% in chip diagonal causes the same amount of variation in throw ratio? For example, that a 1.8-3.0 zoom lens effectively becomes a 1.6-2.6?

Posted by Steve Guttag (Member # 268) on 03-22-2011, 11:31 AM:

Yes...more or less.

Note, there are supposed to be 4K lenses coming out (higher MTF to better resolve the 4K pixels).