File:Double arm, Type 4 barn-door drive for astrophotography.jpg
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Summary[edit]
| Description |
English: Type 4, double arm barn-door drives allow for better tracking than single arm drives (even in manual mode) reducing star trailing and allowing for very long exposures, even with long lenses. Trailing error is in the order of 4 arc seconds or better for 50 minute exposures, depending on adequate polar alignment (PA) |
| Date | |
| Source | Own work |
| Author | Gerard Prins |
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I, the copyright holder of this work, hereby publish it under the following license:
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 05:09, 31 January 2018 | | 1,600 × 895 (206 KB) | Gerard Prins (talk | contribs) | User created page with UploadWizard |
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