Hi, first let me address the LSC part of the question.
Someone asked about this just the other day, and unfortunately I discovered I still haven't written down any formal instructions anywhere for making your own LSC measurements. I did point them at this post where I explained what to do, so your best bet would be to check that out and then come back to us if you need more information.
Can you say why you feel you need to adjust the LSC correction? I only ask because some adjustments - such as more or less brightening round the image edges - can be accomplished trivially in the camera tuning file without measuring anything new. It's only when you need to adjust the colour shading, or make very specific luminance adjustments that you need to follow the steps indicated above.
As regards the focusing problem, it does sound to me like you're just noticing the shallow depth of field that you get when focused very close. If you focus on a distant scene, there'll likely be some softness around the edges, but are there any areas of the lens that look conspicuously bad?
Someone asked about this just the other day, and unfortunately I discovered I still haven't written down any formal instructions anywhere for making your own LSC measurements. I did point them at this post where I explained what to do, so your best bet would be to check that out and then come back to us if you need more information.
Can you say why you feel you need to adjust the LSC correction? I only ask because some adjustments - such as more or less brightening round the image edges - can be accomplished trivially in the camera tuning file without measuring anything new. It's only when you need to adjust the colour shading, or make very specific luminance adjustments that you need to follow the steps indicated above.
As regards the focusing problem, it does sound to me like you're just noticing the shallow depth of field that you get when focused very close. If you focus on a distant scene, there'll likely be some softness around the edges, but are there any areas of the lens that look conspicuously bad?
Statistics: Posted by therealdavidp — Fri Mar 07, 2025 9:41 am