Page 2.8
Rev C August 2009
2. Installation
Digital Projection
TITAN sx+600/700.
User Manuall
Notes
The Throw ratio for a particular
lens is fixed, and assumes that
the image fills the width of the
DMD.
For images that do not fill the
width of the DMD, the Throw
ratio is effectively increased. To
correct for this, a Throw Ratio
Factor (TRF) is used.
Choosing a lens by calculation
For any screen size not listed above, or if you need to be more precise, then use the
calculations below.
Identify actual width of the image in pixels.
Calculate the Throw Ratio Factor:
TRF = DMD width (1400)
Image width in pixels
Identify the screen width required.
Identify the throw distance required.
Throw distance calculations are based on the distance from the outer end of the
lens, which will vary from lens to lens. Once a lens has been chosen, the figures
can be checked using the lens extension values given on the next page.
Calculate the throw ratio required.
Throw ratio =
Throw distance
Screen width x TRF
Choose a lens with the required throw ratio from the list at the bottom of the
page.
Check from the list that the lens chosen will work at the throw distance required.
example
An image, 1024 x 768 pixels, screen width 6.5m, throw distance 18m from the
outer end of the lens.
Throw Ratio Factor (TRF) =
1400
= 1.37
1024
Throw ratio required = 18
= 2.02
6.5 x 1.37
Choose the 2.0 - 2.77 zoom lens (105-611).
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Part number
Throw distance range
0.73 : 1 fixed lens
105-607
1.1m - 3.2m (3.6 - 10.5ft)
1.2 : 1 (3 - 15m) fixed lens
105-608
3 - 15m (9.8 - 49ft)
1.2 : 1 (1.2 - 2.0m) fixed lens
105-609
1.2 - 2m (3.9 - 6.6ft)
1.26 - 1.61 : 1 zoom lens
109 236
3 - 15m (9.8 - 49.2ft)
1.5 - 2.02 : 1 zoom lens
105-610
4 - 24m (13 - 79ft)
2.02 - 2.77 : 1 zoom lens
105-611
4 - 24m (13 - 79ft)
2.77 - 4.51 : 1 zoom lens
105-612
9.1m - 45m (30 - 148ft)
4.51 - 7.53 : 1 zoom lens
105-613
12 - 80m (39 - 263ft)
7.5 - 11.2 : 1 zoom lens
109-235
12 - 80m (39.4 - 262.5ft)
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