A Reducing Camera designed by Meinel has been constructed and tested on the 61 cm NCU Cassegrain telescope. The basic principle of RC is to reduce the reflector'sf/13.5 to the equivalentf/2.7 such that the Cassegrain focus image can be reduced on a 35 mm film with almost no loss in sky coverage and in resolution but the exposure time is reduced by a factor of 25. The camera is able to obtain stellar spectra. With a grism and a standard lens the dispersion is 450 Å mm−1, which is comparable to that required for the MK classification. RC constructure and testing results are reported. The method of a wide field spectrograph and that of narrow band differential photography of RC are also discussed.
This is a preview of subscription content, log in to check access.
Buy single article
Instant access to the full article PDF.
Price includes VAT for USA
Carpenter, E. F.: 1957,Publ. Astron. Soc. Pacific 69.
Meinel, A. B.: 1956,Astrophys. J. 124, 652.
Meinel, A. B.: 1980,Construction Notes on NCU Reducing Camera, Arizona Scientific Research, 10121 Catalina Highway, Tucson, Az. 85715.
Morgan, W. W., Meinel, A. B., and Johnson, H. M.: 1953,Astrophys. J. 120, 506.
Kodak Publication No. P-315: 1973,Kodak Plates and Films for Scientific Photography.
About this article
Cite this article
Hsin Heng Wu Photographic and spectrographic observations with a reducing camera on the 61 cm NCU telescope. Astrophys Space Sci 118, 415–418 (1986). https://doi.org/10.1007/BF00651160
- Exposure Time
- Basic Principle
- Narrow Band
- Wide Field