slider and featured image

I’m having a hard time finding the right specs for my featured image and slider image. When I resize the image so it looks okay on the slider, it’s extremely zoomed in via the featured image. And when it looks great in the featured image, it’s sized too small for the slider. I attached two images as an example. Both are using the same image.

Can you advise on how to get around this?

If there isn’t a way… is there a way to utilize different images for both? I don’t really prefer this method as I have to upload two images.

Here is my page for reference: www.lisasit.com

I use the following format: 2560x600px
Try to work from the center with the images.