Sensor Analysis for a DSLR - What F stop?

[jd999uk]

Sharpcap Newbie here. I'm currently doing a Sensor Analysis on my Canon DSLR and lens and I'm wondering whether it's important to set the F stop to wide open or not? Obviously this will not affect DSLR users who have attached a telescope to their camera, but most (all?) Lenses have a sweet spot that is quite often a stop or two down from wide open. As this analysis is required for the smart histogram, I assume it's important for any variable settings to be consistent.
Or am I overthinking this?

Regards,

John

[admin]

Hi John,

When you run the sensor analysis you are testing the characteristics of the imaging sensor - how the light gets to the sensor doesn't really matter (you could run it without a lens, except you would then get dust all over your sensor most likely). That means you can run it at whatever f-stop you like, it will not affect the results.

Two things to consider though...

1) Use the f-stop adjustment in the first stage when you are trying to get the right brightness level for the analysis to proceed - it's much easier doing this with the aperture than trying to change the lighting level

2) Don't touch the f-stop after that point as a number of the steps rely on constant illumination levels for proper operation.

cheers,

Robin

[jd999uk]

Hello Robin.

Thank you for the swift response. I'll forge on with the analysis. I didn't want to waste a lot of time to find out I had a setting wrong as this is a lengthy process!

Cheers

John