I have a Pentax K-x and I got a stock 18-55mm lens with it.
Now I had an old Pentax camera for which I bought a Sigma 28-200mm lens for it (15 years ago).
Now this Sigma 28-200mm lens I attached to the new Pentax K-x and started taking photos with it using a tripod stand.
Now I am facing a few problems with it.
When I'm taking photos at night (cruising yachts), it comes out shaky. I have tried at every ISO and every mode too. Only at ISO above 3200 it comes normal, but very grainy. And at ISO below 3200 it comes out blurry.
How do I fix this? Cause with the standard Pentax 18-55mm lens, I am not facing this problem.