Hello, I'm a new guy here and want to ask about my DSLR problem.
I already use Nikon D5100 for 1 year and 5 months and still love this DSLR. I seldom to use my DSLR because I only use it when on holiday.
On August 2013, I went to a place where the sun so bright, yet still use it to take some photos cause I want to save every holiday moment. The problem begin here, this black stain come up on my picture. I dont know what happened but in my case, its maybe because of the blazing sun.
To make this problem clear, I post some images as an example of the black stain
1. I took the picture below in landscape position.

2. This happens when I take pictures on portrait position (I didn't rotate it, but it show you as it was take on portrait position, right?).

I haven't service my nikon because I want to know what happened to my beloved camera.
Hope the pictures help you to understand what I try to ask. Sorry for my bad English.
Please tell me what is the problem and how to slove it.
Thank you
I already use Nikon D5100 for 1 year and 5 months and still love this DSLR. I seldom to use my DSLR because I only use it when on holiday.
On August 2013, I went to a place where the sun so bright, yet still use it to take some photos cause I want to save every holiday moment. The problem begin here, this black stain come up on my picture. I dont know what happened but in my case, its maybe because of the blazing sun.
To make this problem clear, I post some images as an example of the black stain
1. I took the picture below in landscape position.

2. This happens when I take pictures on portrait position (I didn't rotate it, but it show you as it was take on portrait position, right?).

I haven't service my nikon because I want to know what happened to my beloved camera.
Hope the pictures help you to understand what I try to ask. Sorry for my bad English.
Please tell me what is the problem and how to slove it.
Thank you