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William Shaheen | profile | all galleries >> Astronomy >> Antares 0.5x Focal Reducer Testing tree view | thumbnails | slideshow

Antares 0.5x Focal Reducer Testing

Testing the Antares 0.5x Focal Reducer on the 9.25 inch Celestron EdgeHD. The camera is an SBIG ST-8300M (monochrome) CCD. All images are binned 1x1 (i.e., no binning) which yields an image scale of 0.47 arc-seconds per pixel. My standard practice is to image binned 2x for a scale of 0.95 arc-seconds per pixel. In this series of tests, the camera was moved closer to the telescope (OTA) and later the FR to CCD distance was reduced.

Baseline images taken at f/10 are presented for comparison.

Phase II - testing resumed 12-Dec-2010, using a shorter Feathertouch SCT adapter.

Antares 2 0.5x Focal Reducer
Antares 2" 0.5x Focal Reducer
Baseline
Baseline
20101128_FR-Test2_6.0inches_001-ddp.jpg
20101128_FR-Test2_6.0inches_001-ddp.jpg
20101128_FR-Test1_4.25inches_001-ddp.jpg
20101128_FR-Test1_4.25inches_001-ddp.jpg
20101129_FR_Test-nosepiece_001-ddp.jpg
20101129_FR_Test-nosepiece_001-ddp.jpg
Final reduction
Final reduction
Baseline  - Horsehead unreduced.
Baseline - Horsehead unreduced.
Phase II - 5.75 in.
Phase II - 5.75 in.
Phase II - 5.50 in.
Phase II - 5.50 in.
Phase II - 5.25 in.
Phase II - 5.25 in.
Phase II - 3.75 in. Unbinned - 60s
Phase II - 3.75 in. Unbinned - 60s
Phase II - 3.75 in. Binned 2x - 120s
Phase II - 3.75 in. Binned 2x - 120s
Phase II - 3.75 in. Binned 2x - 240s
Phase II - 3.75 in. Binned 2x - 240s
Side-by-side comparison
Side-by-side comparison