There is no misinterpretation going on here; you underexposed an image and ask why the difference between the two photos you post.@darr
What am I not saying correctly to have everyone misinterpret my post? Incorrect meter reading? There was no meter reading at all. Did you read anything before commenting? Did you see the pictures? Do you understand that BOTH pictures were taken with the exact same settings (other than the filter)?
I purposefully underexposed the photo to test the sensor's latitude. How do you test noise floors with your cameras? Do you bother? When I get new equipment, my first instinct is to test its limits so that I know what it can and cannot handle.
Let me put this in caps so that no one else can misunderstand what is happening here, because the (willful?) misinterpretation of this post has me questioning my sanity.
THIS IS A TEST/EXPERIMENT TO DETERMINE THE BEST SETTINGS FOR THE LOWEST NOISE POSSIBLE ON AN IQ1 80, and get properly acquainted with how much the files can handle in post, and determine why the second photo's noise level was so much higher than the the first. If you don't have experience with this back, or similar ones. I have a good understanding of photography basics, please don't treat me like I'm stupid. Do you personally own this digital back? Have you ever used one?
I appreciate the response, but I don't think you read the previous comments. This isn't a professional shoot, or anything remotely close to that. I'm trying to see how far I can push the files, and also trying to troubleshoot a strange noise issue. BTW, are you still trying to sell all three Merrills at once? I still want to buy the DP3.
You failed to add in the filter factor that made a difference between the two exposures.I'm attaching two pictures to this. They are both shot with the exact same lens, with the exact same settings (A Pentax 90mm @ f2.8 @ ISO50) and were pushed in post about 2 stops. After doing a little bit of searching online, I've heard people say that ISO50 is the sweet spot, so I've been trying to see how far I can push that ISO before I see noise, and for the most part it's been performing pretty well. [
You become very defensive when others try to assist you.
No caps needed, we hear you loud and clear.
The fact you seem to forget or not know that heat causes noise makes some of us think you are unaware of some basic digital shooting knowledge.
To get the optimal results from any digital back, shoot it at base ISO with a proper exposure. It is that simple.
The Sigmas all sold, thank you.