Parts of Camera Image blurry

[J_Lewis87]

I was able to create a camera view looking up through a circular staircase. The vertical surfaces are clear including the stair balustrades.  However, the planes parallel to the floor are blurry.  

Does anyone know what might be going on and how to fix the issue?

[barthbradley]

Try Increase/Decrease Focal Length of Camera.  

[J_Lewis87]

No bueno.

I zoomed in and zoomed out.  I've attached the latter. Oddly the underside of the stairs is the most blurry.

[mauricio_mssf · Accepted solution]

I don't think it's out of focus, it seems that the problem is in the stair material, the texture is very small or of low quality, so it looks blurry.

Try to change the material or the texture image.

If the answer solves your problem, click Accept as Solution this helps other users to quickly find an answer and let a like if you liked it. 

[J_Lewis87]

Thanks, that corrected the issue. I had forgotten to assign the treads a material. So I assigned one and the blurriness abated: