Armory Sponsor
Posted: 3/31/2011 6:55:00 AM EDT
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does anyone know how to work out the magnification of the thermal lenses there are many but - for eg. - FLIR Recon M18 640x480 Thermal Monocular - this is listed as having a 18degree fov . but is that 1x mag? , it just does not say in any of the info. then it is listed as having 13.8 x 10.4 degree lens -what does that mean in terms of magnification ? i cant make head nor tail of it -
nor do they say if they are a fixed focus lens or if it can be turned to focus it |
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the 320 version says this -
IMAGING PERFORMANCE FPA resolution 320 x 240 E-Zoom 2x, digital Field of view 13.8° x 10.4° Versatility Extender lens option the 640 version says this - IMAGING PERFORMANCE FPA resolution 640 x 480, 320 x 240 (option) E-Zoom 2x, 4x digital Field of view 18.7° x 14° (standard), 13.8° x 10.4° (optional) Versatility Extender lens option now this - to my mind - implies that it is native 1x magnification , but it just does not confirm this anywhere - it also offers two different lenses which dosent help at all- i would guess the optional narrower field lend could be the 2x - but why cant they just say for sure? |
Armory Sponsor