What is the consensus opinion on which lenses to buy? I want to build a kit and I don't know which direction to go. I don't own any flash and mostly just shoot life stuff as a hobby. However, I may want a strobe for portraits later on, but that's a maybe.
I'd shop to see the difference in price between a used S and CS lens of the same focal length. If you are buying new, the used prices will tell you the % of retain value for buying a CS lens.
From a creative perspective, a CS lens provides an advantage mostly when using lighting outdoors because higher shutter speed sync allows control of background exposures to tame backlit, bright/sunny/blown-out type backgrounds.
In a darkened studio environment that advantage is lessened since flash duration is usually as fast or faster than the S camera's shutter speed (typically 1/800 to 1/1500 sec duration). I still use CS mode in studio because my working space isn't light tight ... so 5 of my S lenses are CS versions and 1 is not: S-100/2
As mentioned, the CS exceptions are the zoom and S-100/2. I shoot a lot of portraits with the 100mm (roughly a 70 or 75mm in 35mm terms). If I need HSS flash for a portrait, it is either the CS70/2.5 (full length) or CS120/2.5 (head shot to waist-up). The 120 is a macro and is not exactly a fast focusing lens.
Interestingly, a really good option for portrait work with the S camera is an adapted Hasselblad 100/2.2, use it as a leaf-shutter to 1/800th sync, or as a focal plane lens to 1/4000.
Hope this helps a little,
- Marc