In looking on-line, I'm seeing some retailers posting that the Photon S is discontinued by Sightmark and offer a Photon-XT at the same $499 price point.
Photon S
Photon XT
Sightmark Photon XT 4.6x42S Digital Night Vision Riflescope - Digital Night Vision 1 - Rifle Scopes - SM18008 - nightvisionguys.com
The XT version appears to be identical in every way except is a few oz lighter, has higher magnification and a longer range.
Photon S
Specifications:
- Model #: SM18006
- Type of CCD Array: EIA CMOS, 1/3"
- Camera Resolution PixelsEIA)768x576
- Display Resolution Pixels: 300x225
- Video Out: Yes/RCA
- Magnification: 3.5x
- Objective Lens Diameter: 42mm
- Field of View 100m: 7m
- Minimum Focusing Distance: 1m
- Eye Relief: 82mm
- Emitter: LED
- IR Wavelength: 805nm
- Equivalent IR Power: 150mW
- Range of Detection: 100m
- Battery Types: 2xAA (Night Vision) / CR2032 (Reticle)
- Battery Life(w/o IR):4 hours
- Battery Life(with I/R): 3 hours
- Windage and Elevation, 1 Click (H/V), mm@100mL 7/7 (1/4 MOA)
- Windage and Elevation MOA Range: 40 MOA
- Reticle Color: Black Subtensions / Red Dot
- Type of Mount For Attachments: Weaver
- Operating Temperatures Range: -14°F to 122°F
- Tube Diameter: 30mm
- Dimensions: 350x77x80mm
- Weight: 31.7oz
Photon XT
Sightmark Photon XT 4.6x42S Digital Night Vision Riflescope - Digital Night Vision 1 - Rifle Scopes - SM18008 - nightvisionguys.com
Technical Specifications
Product Specifications
Electronic Components Type of CCD Array, EIA CMOS, 1/3" Camera Resolution, pixels (EIA) 768x576 Display Type Kopin KCD-QD05-AA Display Resolution, pixels 640x480 Video IN/OUT Availability No/Yes Pin Type of Video Output RCA Product Specifications Optical Characteristics Magnification, x 4.6 Objective Lens Diameter, mm 42 Lens Focus, mm 50 Relative Aperture, D/f' 01:01.2 Field of View, degrees (horizontal) 6.5 Field of View, m@100m 7 Minimum Focusing Distance, m 1 Eye Relief, mm 82 Diopter Adjustment, dptr. -2 ... +2.5 Focusing Type of Distance Objective Resolution, lines per mm 36 Product Specifications Built-In IR Illuminator Emitter LED IR Wavelength, nm 805 Equivalent IR Power, mW 150 Product Specifications Range of Detection Range of Detection, m 135 Product Specifications Power Supply Power Supply 3 Battery Type 2xAA (Night Vision) / CR2032 (Reticle) Battery Life (w/o IR), hours 4 Battery Life (with I/R), hours 3 External Power Supply DC 8.4 ÷ 15 Product Specifications Reticle Windage and Elevation, 1 Click (H/V), mm@100m 7/7 (1/4 MOA) Windage and Elevation MOA Range, MOA 40 Reticle 6: 2 Duples, 2 Crossbow, 2 MilDot Reticle Color Black Subtensions / Red Dot Product Specifications Physical and Operational Characteristics Lens Material Glass Body Material Glass-Nylon Composite/Metal Type of Mount For Attachment Weaver Operating Temperature, °F -14 ... +122 Level of Protection IPX4 Nitrogen Purged No Remote Control No Shock Resistance, G's 1000 Tube Diameter, mm 30 Dimensions, mm 350x77x80 Weight, oz 22
The XT version appears to be identical in every way except is a few oz lighter, has higher magnification and a longer range.