| Telescope | 300mm f/6 Newtonian |
| Date | May 1998 |
| Instrument | SBIG ST-4 |
| Filter | none |
| Exposure Time |
180s each |
Problem:In extreme cases, the condensation on the dewar window can be frozen, causing features like the ones above to appear (filamentary structure in the field of view -- somewhat similar to fringing -- or dark "fingers" on the side of the field). |
Fix:Fix depends on the observatory but may include dewar window heating. |
See example of frost on inside of dewar window (large ellipsoidal ring in image)
Return to Condensation on Dewar Window