【DC】DSLR 伙拍天文望遠鏡[+]
玩 DSLR 的人，通常都意不在普通的拍照，是真正去拍攝！DSLR (Digital Single Len Reflex) 即傳統單鏡反光相機的數碼版本，簡稱數碼單鏡反光相機
Vixen Large Accessory Plate (LAP) transporting Vixen 70S (70mm, f/6) guidescope, Vixen GA-4 guider, [color=Blue]Nikon D70 DSLR with 180mm ED lens[/color], mounted on Losmandy Universal Plate and camera holder, Nikon DR-6 angle finder. Note the Velcro strap anchoring objective end of 180mm, f/2.8 lens.
[img=188,188]http://www.barrie-tao.com/graphics_jpg/d70180mm_gpdx2.jpg[/img]
[img=188,188]http://www.barrie-tao.com/graphics_jpg/questar_d70.jpg[/img]
Any monitor with an RCA phono input plug can be used. A TV is not suitable because the dot pitch is too coarse for accurate focus and display of stars. Don't be confused by terminology like horizontal lines, number of pixels, etc. Only the "Dot Pitch" parameter is of interest, and this number should be under .20 mm for accurate focusing. The black/white security monitors are ideal if one has access to the mains and an enclosure (observatory). My choice for a monitor was the small professional grade Marshall VLCD4-Pro. The key features of this monitor was portablility, 12V operation, .17mm dot pitch, dual video inputs, and multiple image adustments; including the option of a B/W display. This image shows a setup with the monitor attached to the D70 (note: shown are crosshairs of sewing thread taped across the screen for purposes of Video Guiding. See Thomas Dobbins, "Video Astronomy").
[img=188,188]http://www.barrie-tao.com/graphics_jpg/d70_focus_gpdx.jpg[/img]
[[i] Last edited by d228216 on 2005-8-22 at 01:34 AM [/i]]
Canon EOS 300D Images
[img]http://www.bryanbradley.com/Avg_LastQtrW_1o250sec_800_08_08_x6.jpg[/img]Here is the Last Quarter Moon taken 8/8/04 at 1am. This image is a composite of 6 individual stacked frames. Imaged on a 1600mm SCT telescope and a Canon Digital Rebel/300D camera. Image speed ISO800. 6 images at 1/250 each. Images Plus used for stacking and levels adjustment.
[img]http://www.bryanbradley.com/M4%202min%20iso800%20x3.jpg[/img]
Globular Cluster M4.
Taken at 11:00 pm, June 12, 2004. Image is a composite of 3 x 2 minute frames taken at prime focus with a Canon 300D DSLR. No Dark frame used, and somewhat cropped to fit.
[img]http://www.bryanbradley.com/M101_1600x3minx10_stretch_c.jpg[/img]
M101, The Pinwheel Galaxy located in the constellation Ursa Major.
Date: 5/9/05 11:30pm Focal Length: 1600mm, f/stop: 6.3, Exposure Time: 3x10 minutes, ISO 1600 Canon 300D at Prime Focus.
[img]http://www.bryanbradley.com/117_1703.JPG[/img]
Messier 8 the Lagoon Nebula (bottom), and Messier 20 the Trifid Nebula (top).
The streak bottom left is a plane. Single wide field 300mm camera shot taken in August 2004. Image slightly cropped, and levels adjusted with Images Plus. No dark frames used.
[img]http://www.bryanbradley.com/LE_11_09.jpg[/img]
Total Lunar Eclipse on 10/27/04. This picture is at mid totality at 11:09pm EDT from Robert Moses State Park, Fire Island, NY. It was taken with a Canon 300D, ISO 400, 2 seconds, f/4, on a 25.4 cm SCT.
[img]http://www.bryanbradley.com/venus0023.JPG[/img]
Here is a unique and very rare transit of Venus across the face of the Sun on June 8th, 2004. Unfortunately, clouds came in at daybreak when the transit occured and almost totally obscured the view. Here are a few pictures of Venus at the very end of the early morning transit.
[[i] Last edited by sohozhk on 2005-8-6 at 12:22 AM [/i]] [quote]Originally posted by [i]sohozhk[/i] at 2005-8-5 11:21 PM:
玩 DSLR 的人，通常都意不在普通的拍... [/quote]
用部 D70 影天文同影 IR 的人.... 有個教你除 IR blocking filter 嘅 webpage :)
[b]Link: [url=http://www.astrosurf.org/buil/d70/ircut.htm]INCREASE THE RED AND INFRARED RESPONSE OF THE DSLR Nikon D70[/url][/b]
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