A.Ghamarinezhad`s AstroPhotography Gallery - Nightsky

amand_trace
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albireo-cyg
albireo-cyg
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cloudy-moon
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gamma-north
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ghamarinezhad-solar-eclipse
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jamal
jamal
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lunar-eclipse11
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madan-trail_w
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moon-amp-tree
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  • DPReview TV: 70-200mm F4 lens shootout

    70-200mm F4 zoom lenses may not get as much attention as their faster F2.8 siblings, but for many photographers these lenses hit the perfect sweet spot of price, performance, and weight.

    This week, Chris and Jordan go to the Calgary Stampede with pro photographer Kyle Marquardt to shoot the Canon 70-200mm F4, Nikon 70-200mm F4, and Tamron 70-210mm F4. Watch the episode to find out what they think.

    Also, make sure to read our recent review of the Tamron 70-210mm F4.

    Read the Tamron 70-210mm F4 review

    Make sure to subscribe to our YouTube channel to get new episodes of DPReview TV every week.

    Subscribe to our YouTube channel

  • Blackmagic external GPU for MacBook Pro now available from Apple

    Australian digital cinema company Blackmagic recently worked with Apple to develop Blackmagic eGPU, an external GPU that brings "desktop-class graphics performance" to the new MacBook Pro laptops with Thunderbolt 3 ports.

    The Blackmagic eGPU features an AMD Radeon Pro 580 graphics processor with 8GB of GDDR5 memory, one HDMI 2.0 port, four USB 3 ports, two Thunderbolt 3 ports, and an 85W power supply. Thunderbolt 3 provides a 40Gb/s connection over a single cable, enabling rapid data transfers between the external graphics processor and MacBook Pro.

    Graphics performance speed improvements depend on the laptop model; The Verge reports that the 13-inch MacBook Pro experiences an 8x boost, while the 15-inch model experiences a 2.8x increase.

    As a first for external GPUs, the eGPU's second Thunderbolt 3 port provides optional connectivity with the LG UltraFine 5K Display, the model Apple offers directly, and other Thunderbolt 3 displays. A second monitor can be connected via the HDMI port; peripherals, such as a mouse and keyboard, can be plugged into the eGPU's USB hub.

    Users must be running macOS 10.13.6 High Sierra or later to use the Blackmagic eGPU. Apple is exclusively offering the device through some of its retail stores and online for $699 USD.

    Via: The Verge