Southern Swine Slayer
- Joined Mar 2014
- Posts 159
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EE 100% (4)
TX, USA
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Posted: 7/23/2014 9:38:22 PM EDT
[Last Edit: UNV]
[#2]
Quote History Originally Posted By Snowden: All other factors are definitely NOT the same. The objective lens of the ThOR 640 5x obviously also has twice the focal length of the ThOR 640 2.5X.
When both use the same microbolometer, double the magnification of the 5X results in 1/4 the area in the field of view, which requires four times the light gathering capability of the 2.5X. Doubling the objective lens diameter of the ThOR 640 2.5X provides exactly that.
View Quote View All Quotes View All Quotes Quote History Originally Posted By Snowden:Originally Posted By UNV:Below are images to illustrate the difference in thermal lens size. The ATN ThOR 640 2.5X has a 50mm lens and the ATN ThOR 640 5X has a 100mm lens. All other factors including thermal cores are the same on these 2 units. All other factors are definitely NOT the same. The objective lens of the ThOR 640 5x obviously also has twice the focal length of the ThOR 640 2.5X. When both use the same microbolometer, double the magnification of the 5X results in 1/4 the area in the field of view, which requires four times the light gathering capability of the 2.5X. Doubling the objective lens diameter of the ThOR 640 2.5X provides exactly that. Thanks for your post, but I think you might be misunderstanding. The only difference in these 2 units is the lens. All othe factors/components ARE the same... Obviously lens size changes FOV, focal length, magnification and depth of focus. That's the point of the comparison images. This thread is to show people who have asked how the image is changed by lens size. These 2 images are from scopes that are identical except for the lens.
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