MC-21 Sigma SA to L mount

George1958 wrote:

Hi, I am considering buying a Sigma FP but I am torn between this and a Sigma Quattro H. I have an SD15 and the 18-35 F1.8 Art and the 50-100 F1.8 Art.

These I understand would be fine on the Quattro. However I go down the FP road and use the MC-21, will I get vignetting or experience cropping of the FP sensor given my lenses are APSC?

I can't really justify the expense of buying new L Mount lenses at this time.

My thanks in anticipation

George

George, what are you hoping to accomplish? Do you want a smaller camera? Do you want to get more resolution in your images? Are you wanting a tilting viewfinder? (I'm guessing that's not high on your priorities list, since you're considering the SD Quattro H.) Do you want to be able to shoot at higher ISO settings, with better results? Do you just want an EVF? Are you looking to increase the speed at which you can shoot?

If you like the Foveon look, you are probably going to be happier with the SD Quattro H, though I don't think you'll be able to get one new now. If you want to be able to get good results shooting at ISO 6400, then I suggest the fp as your solution. I believe the SD Quattro H will give you very similar results to your SD15, though with more resolution. Even at ISO 3200 though, the image quality is pretty horrendous, unless you're shooting in monochrome or converting your images to monochrome. I think of all the Sigma cameras with Foveon sensors to be limited to practical ISO settings from 100-1600, and I almost never go above ISO 200, because I just don't like the noise in my images. I feel the same way about using high ISO settings with other cameras too, but not to the same degree. I have actually shot my Nikon at ISO 6400.

As far as vignetting is concerned, your APS-C lenses will indeed work pretty well on the SD Quattro H, but not so well on an fp. If you get the fp-L though, you'll have enough megapixels that you can crop a lot, and still have a 30 or 40 MP image. Also there is the possibility of using some of the different shooting formats. If you use 21:9 or square format, for example, you may find you'll get very little vignetting at most focal lengths with your lenses.