We discovered that it doesn't make that much difference which thread we use. There is not much turning to get focus with either one, but we used the short one (already ordered ours, should be here next week). Used mirror lock-up.
Originally Posted by Dennis
That's a very nice image Tony - which SCT T-thread adapter did you use - long or short?
Also, does the Canon have a mirror lock up, and did you use it? I seem to get a lot of vibration from the Pentax when the mirror flips up.