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davidfung
Hi. I am looking at using an RTSII (with fully mechanical B and mirror lock-up) to do both prime focus photography with a telescope and with Zeiss lenses. I have some questions that I would like to ask other Contax/Zeiss users:
1. What experiences have you had in the past with astrophotography with Zeiss?
2. Which of the moderate telephotos: 85, 100 and 135, has good performance. I guess it is measured by objects at infinity, with very little coma, chromatic abberation, astigmatism and spherical abberations (The Siedel Ones).
3. Which f-stops have you found with the various lenses that gives optimal perfomance, under the above criteria. Given that a faster f-stop is better for exposure times.
4. Which other lenses and f-stop combinations would you recommend.
5. OT: Which slide film gives good performance for you?
Thanks so much for sharing your experiences and thoughts.
1. What experiences have you had in the past with astrophotography with Zeiss?
2. Which of the moderate telephotos: 85, 100 and 135, has good performance. I guess it is measured by objects at infinity, with very little coma, chromatic abberation, astigmatism and spherical abberations (The Siedel Ones).
3. Which f-stops have you found with the various lenses that gives optimal perfomance, under the above criteria. Given that a faster f-stop is better for exposure times.
4. Which other lenses and f-stop combinations would you recommend.
5. OT: Which slide film gives good performance for you?
Thanks so much for sharing your experiences and thoughts.