Astronomy - David Mathre Photography

Sunday (31-July-2011) — New Jersey

Backyard Summertime Night Sky Over New Jersey.

Going from sunspots to startrails. The view is from my back deck over the roof. A tree in my front yard just blocks the north star. The image is a composite of 326 30-second exposures combined using the Startrails program. There are at least four jet trails, and a couple of meteor trails. The meteor trails are too faint in the composite, so I included a crop from a single image showing a meteor trail. I’ve also added a version of the startrails in B&W, converted using Nik Silver Efex Pro 2.

North View Star Trails. Summer Night in New Jersey. Image taken with a Nikon D3s and 24 mm f/1.4G lens (ISO 400, 24 mm, f/4, 30 sec). Composite of 326 images combined using the Startrails program. (David J Mathre) — North View Star Trails. Summer Night in New Jersey. Image taken with a Nikon D3s and 24 mm f/1.4G lens (ISO 400, 24 mm, f/4, 30 sec). Composite of 326 images combined using the Startrails program.

Meteor Trail. Summer Night in New Jersey. Image taken with a Nikon D3s and 24 mm f/1.4G lens (ISO 400, 24 mm, f/4, 30 sec). Raw image processed with Capture One Pro, Nik Define, and Photoshop CS5 (David J Mathre) — Meteor Trail. Summer Night in New Jersey. Image taken with a Nikon D3s and 24 mm f/1.4 lens (ISO 400, 24 mm, f/4, 30 sec). Raw image processed with Capture One Pro, Nik Define, and Photoshop CS5

Saturday (30-July-2011) — New Jersey

Backyard Summertime Sky Over New Jersey. Solar Disk and Sunspots.

One of the websites that I follow for sunspot and auroral (northern light) activity is SpaceWeather.com. I noticed yesterday and today that there are three new sets of active sunspots (1260, 1261, and 1263). My telescopes have solar filters to allow safe viewing of the solar disk. The following images were taken with a 3.5″ and 7″ Questar telescope and clearly show the sunspots. The third image has some clouds passing in front of the solar disk. The solar filter for the 3.5″ telescope is darker (lets through less light) than the filter for the 7″ telescope. This required increasing the ISO and decreasing the shutter speed for the smaller telescope. Another issue with the smaller telescope is that it is much more sensitive to mirror slap and shutter motion. In order to get a sharp image, I used the mirror-up feature and waited 30 seconds to let the entire system stabilize. With the larger telescope this is still a problem, but attenuated due to the overall extra weight of the telescope relative to the Nikon D3s camera. The higher magnification of the larger telescope however, increases the effect of vibration. Focusing was done viewing the image through the camera using LiveView — and using a HoodMan to be able to view the LCD screen. After shooting images (and videos) for about 30 minutes, I did get a sensor over heating warning (which then turned LiveView off).

Sun with Sunspots. Image taken with a Nikon D3s and Questar 3.5 inch telescope with solar filter (ISO 640, ~1500 mm, f/16, 1/250 sec). Raw image processed with Capture One Pro 6, Nik Define 2, and Photoshop CS5. (David J Mathre) — Sun with Sunspots. Image taken with a Nikon D3s and Questar 3.5 inch telescope with solar filter (ISO 640, ~1500 mm, f/16, 1/250 sec). Raw image processed with Capture One Pro 6, Nik Define 2, and Photoshop CS5.

Sun with Sunspots. Image taken with a Nikon D3s and Questar 7 inch telescope with solar filter (ISO 200, ~2500 mm, f/16, 1/2000 sec). Raw image processed with Capture One Pro 6, Nik Define 2, and Photoshop CS5. (David J Mathre) — Sun with Sunspots. Image taken with a Nikon D3s and Questar 7 inch telescope with solar filter (ISO 200, ~2500 mm, f/16, 1/2000 sec). Raw image processed with Capture One Pro 6, Nik Define 2, and Photoshop CS5.

Sun with Sunspots and Clouds Passing in Front. Image taken with a Nikon D3s and Questar 7 inch telescope with solar filter (ISO 200, ~2500 mm, f/16, 1/2000 sec). Raw image processed with Capture One Pro 6, Nik Define 2, and Photoshop CS5. (David J Mathre) — Sun with Sunspots and Clouds Passing in Front. Image taken with a Nikon D3s and Questar 7 inch telescope with solar filter (ISO 200, ~2500 mm, f/16, 1/2000 sec). Raw image processed with Capture One Pro 6, Nik Define 2, and Photoshop CS5.

Saturday (16-July-2011) — New Jersey

Backyard Summertime Night Sky Over New Jersey.

Multi-Exposure Waxing Gibbous Moon — Going Up, Going Down. A ten exposure image of the waxing gibbous moon going up or down using the in camera multi-exposure function. The exposure times were varied in 1/3 EV increments (1/1000, 1/800, 1/640, 1/500, 1/400, 1/320, 1/250, 1/200, 1/160, 1/125, second). The exposures were taken every 30 seconds and used mirror up to minimize camera/lens vibration.

In Camera Multi-Exposure of Waxing Gibbous Moon over New Jersey. Image taken with a Nikon D3x and 600 mm f/4 VR telephoto lens + TE-E III 20 teleconverter (ISO 400, 1200 mm, f/4 1/1000 to 1/125 in 1/3 EV). Raw image processed with Capture One Pro 6, and Photoshop CS5.. (David J Mathre) — In Camera Multi-Exposure of Waxing Gibbous Moon over New Jersey. Image taken with a Nikon D3x and 600 mm f/4 VR telephoto lens + TE-E III 20 teleconverter (ISO 400, 1200 mm, f/4 1/1000 to 1/125 in 1/3 EV). Raw image processed with Capture One Pro 6, and Photoshop CS5..

Thursday (14-July-2011) — New Jersey

Backyard Summer Nighttime Sky over New Jersey.

Waxing gibbous moon with 100% illumination (data from the US Naval Observatory site). The full moon is on the 15th. This month the full moon is known as the “Thunder Moon”. Image taken just after midnight with a Nikon D3s camera and Questar 3.5″ telescope (ISO 1600, ~1500 mm, f/16, 1/1000 sec). Raw image processed with Capture One Pro and Photoshop CS5.

Thursday (14-July-2011) — New Jersey

Backyard Summertime Night Sky Over New Jersey.

A DSLR video and still image of the July “Thunder Full Moon. These were taken with a Nikon D3s camera and Questar 7” telescope. The moon disk just fits within the D3s sensor, and is clipped in the video. The official full moon is on the 15th, but these images and the video were taken within 4 hours of the full moon on the 14th. I used Adobe CS5 Premiere Pro to edit the video. The digital art version of the full moon was created using Nik Color Efex Pro — Weird Lines Filter.

Thunder Full Moon Digital Art. Summer Night in New Jersey. Image taken with a Nikon D3s and Questar 7 inch telescope (ISO 1600, ~2500 mm, f/16, 1/400 sec). Raw image processed with Capture One Pro 6, Nik Color Efex Pro (Weird Lines) and Photoshop CS5 (David J Mathre) — Thunder Full Moon Digital Art. Summer Night in New Jersey. Image taken with a Nikon D3s and Questar 7 inch telescope (ISO 1600, ~2500 mm, f/16, 1/400 sec). Raw image processed with Capture One Pro 6, Nik Color Efex Pro (Weird Lines) and Photoshop CS5

Thunder Full Moon over New Jersey. Image taken with a Nikon D3s and Questar 7 inch telescope (ISO 1600, ~2500 mm, f/16, 1/400 sec). Raw image processed with Capture One Pro 6, Nik Define 2, and Photoshop CS5 (David J Mathre) — Thunder Full Moon over New Jersey. Image taken with a Nikon D3s and Questar 7 inch telescope (ISO 1600, ~2500 mm, f/16, 1/400 sec). Raw image processed with Capture One Pro 6, Nik Define 2, and Photoshop CS5