Astrophotography with a digital SLR camera
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1 Kostas Christodoulopoulos 1
2 Main equipment Vixen 4" achromatic refractor Focal length: 1000mm Focal ratio: f/9.8 Vixen GP equatorial mount Vixen Skysensor 2000 PC Laptop PC Main software DSLR Focus, MaxDSLR, Photoshop 2
3 Camera Canon EOS 300D digital SLR (body) CMOS sensor size: 22.7x15.1 mm Pixel size: 7.4x7.4 microns 6.3 megapixel resolution (3072x2048) 12 bit per color channel R,G,B (RAW format) Weight body plus battery and CF card: 649 gr Canon EF 24-85mm f/ USM lens Weight: 380 gr 3
4 Pros for the 300D Big CMOS sensor 23x15mm, with low noise High resolution: 3072x2048 active pixels Shutter speeds: 1/ sec plus BULB mode ISO speeds: Lightweight Widely useable with all Canon compatible lenses Can be used for regular photography 4
5 Cons for the 300D Low response to H-alpha due to IR-cut filter of CMOS sensor 12 bit per color channel R,G,B (RAW format) instead of 16 bit for most astronomical CCDs No mirror lock up No cooling possible: better operation during cold ambient No multiple exposure mode Optical viewfinder provides low magnification LCD monitor no live preview 5
6 Hot pixels comparison luminance luminance hot pixels hot pixels 1 frame: 30 sec ISO frame: 15 min ISO 800 Program used: Dead/hot Pixel Test (c) Michael Salzlechner Threshold for hot pixels=60, Threshold for dead pixels=250 6
7 Russian Firmware Hack Custom Functions Mirror lock up ISO speed 3200 Canon EOS 300D Canon EOS 10D 7
8 Canon EOS 300D modification Removal of CMOS sensor IR-cut filter Increased H-alpha sensitivity Uncalibration (White balance, Auto focus, Manual focus) Plans for Peltier cooling 8
9 Useful accessories AC adapter kit ACK-E2 RS-60 E3 remote control Battery pack BG-E1 Angle finder C 9
10 Astrophotography tips Balanced, cooled system Steady mount (no vibrations) Skysensor adjustments (PEC,backlash) Polar alignment (star drift method) Good seeing Preferably dark sky Object in high altitude for better results Less optical elements - more image quality Filters to reduce chromatic aberration (achromatic refractors)
11 Astrophotography methods Tripod Piggy-back Prime focus Eyepiece projection Typical camera settings Auto Rotate: off Image quality RAW, ISO range Mode: Manual Manual Focus to infinity (piggy-back) Mirror lockup enabled (planets) & self timer enabled 11
12 Calculations Image scale Field of view Chip size Ideal Image scale: 2"/pixel (DSO) 0.5"/pixel (planets)
13 Tripod astrophotography Star trails Solar scenes (sunset, sunrise, eclipses) Lunar scenes (moonset, moonrise, eclipses) Wide field (Milky Way, Constellations) 13
14 Piggy-back astrophotography Bright deep sky objects Wide field (Milky Way, Constellations) 14
15 Recommended Canon lenses for piggy-back astrophotography Wide angle EF 15mm f/2.8 Fisheye Normal EF 50mm f/1.4 USM Tele photo EF 100mm f/2 USM EF 200mm f/2.8 L II USM EF 300mm f/4.0 L USM (remember digital factor=1.6) 15
16 Prime focus astrophotography Deep sky objects Multiple stars Sun (disc, sunspots, eclipses) Moon (disc, eclipses) & planets 16
17 Eyepiece projection astrophotography (w/wo Barlow lens) Planets Sun Moon 17
18 Piggy-back astrophotography example Orion sword Location: Tripotama Achaias Date: 06/11/
19 Equipment preparation Scope in horizontal position, cooled & balanced Skysensor setup (location, time, mount mode) Polar alignment (star drift method) 3-star alignment with Skysensor Perform GOTO star Alnitak Center star Alnitak in the scope field of view (illuminated reticle eyepiece) 19
20 Camera preparation Camera battery fully charged Camera mounted piggy-back Manual Focus set to infinity Camera connected to the laptop (USB port) DSLR Focus started camera connected Bulb mode selected Image RAW format selected Serial cable for long exposures enabled (USB port) Test shots to adjust focus and camera exposure settings (ISO, Tv, Av) 20
21 Image capture 3 frames x10 min ISO dark frame x10 min ISO 800 Problems encountered Dew in camera lens and scope lens Some light pollution 21
22 Image processing MaxDSLR Set Calibration (Dark frame)
23 MaxDSLR Camera Raw Images calibrated and converted to TIFF 16-bit format
24 MaxDSLR Combine TIFF images (align mode selected)
25 Photoshop Find white/black points (threshold adjustment) in the result image
26 Photoshop Select black/white points (Color sample tool)
27 Photoshop Correct image black/white points with Levels (R,G,B channels) Adjust brightness with midtones
28 Photoshop Enhance image brightness & contrast with Curves (R,G,B channels)
29 Photoshop Enhance image details with Unsharp Mask filter
30 Photoshop Resize/crop image and save it for the web (jpg format)
31 Image Comparison Before After
32 Useful links Astrophotography guide for EOS digital Canon EOS 300D modification Russian FW hack for the 300D Photoshop for astrophotographers DSLR Focus MaxDSLR 32
33 Thank you very much!!! Clear skies!!! 33
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