Viewfinder image too small

I just bought a Sea&Sea MDX-D810 housing and find that the image through the stock viewfinder is very small. I had a Sea&Sea MDX-D700 before and the view seemed fine. Are there adjustments I can make, or replacement viewfinders that will make the image larger?

Thank for any advise on this.

Randall

I had mdx300 and now have the mdx800. I've used a 45 degree viewfinder, and find it excellent; http://www.seaandsea.jp/products/digital_slr/accessory/011.html