Alan, that makes complete sense. Don't know why I didn't think of it. In fact, I've never really view the image file sizes. Went for a walk today and returned with some 200 images. Reading your reply, I searched for them in the finder (Mac) via LR4 and saw, they range in size from 9.9 to 15.9 MB.
Yes, the CF capacity topic makes sense to me now. Thanks for your explanation!!