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NGC
6633 - IC 4756 (500mm)
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Near the bright regions of the summer Milky
Way, NGC 6633 and IC 4756 are two beautiful open cluster, wonderful if
observed with a binucular from a really dark sky.
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Technical Data
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| Optics |
Pentax 75 apochromatic
refractor |
| Focal Lenght |
500 mm |
| Focal Ratio |
f/6,7 |
| Exposure Time |
35 min exposure |
| Film |
Kodak E200 |
| Developement sensibility |
320 ISO |
| Location |
Capanne di Cosola (AL,
on the Appennines, Italy) at 1500m |
| Date and time of exposure
start |
31 may 2003, 23.07 UT |
| Mount |
Gemini G41 |
| Tracking |
ST4 |
| Temperature and humidity |
T=+11°C, RH=66% |
| Notes |
- |
