Erik Kaffehr

I would recall that the 'Delta' coding uses just seven bits over 16 pixels. So if the luminance range within those 16 pixels exceeds 2^7, that is 1:128, artifacts will result. Best regards Erik

Basically, the Sony compression algorithm is good enough, but there are cases when it can break down. Here is some good analysis from Jim Kasson: https://blog.kasson.com/the-last-word/does-sony-raw ...

That is all about usability, not about image quality. I have acquired an A7rIV a year ago. It is a huge gain in usability over the A7rII, but very little gain in image quality. I have some 'tilt ...

It is a bit about physics. Normally, any capture would be dominated by shot noise. In the 'basement of exposure' sensor read noise comes into play. DR is essentially saturation signal divided by ...

Depending on needs, we can do with far less stuff. Resolving grain needs a lot of accuracy, though. Another approach may be to use a small sensor camera on a motorized XY-bench and stitch say 64 ...

It all depends. My experiments indicate that it takes around 20 MP to surpass Velvia 67 on 6x7 cm film. But it may depend on the intent, here are some examples: (1) I want to make a 30"x40" print from ...

Just to say, that image tells a story. It is nice to see an image of the man behind all those great postings. Say congratulations to the photographer! Great way to show that a picture can tell more ...

Where I live. Two images stitched. Swedish national flag on the left copied from another exposure. Dolomites, waiting for the sunset. Best regards Erik

I wouldn't see the video feature of still cameras as a replacement for a video camera, but as an option to complete still with motion. I often use my images for slide shows, and adding some video ...

Hi, I may agree somewhat. I did comparison between 24 MP on 24x36 and 39 MP on medium format back in 2014 and I was not able to see a difference in 16"x23" prints. Printing 30"x40", I think that 24 ...

Thanks for sharing! Best regards Erik

Best regards Erik

If you don't need the megapixels, I think it would be a good move. I have somewhat reluctantly bought the A7rIV after having my A7rII for five years. The A7rIV is a great usability upgrade. I would ...

The feature I want most on Sony A7 series is focus bracketing, but I guess there is some reason Sony doesn't implement that. 4K at 120 FPS is also on the list. More resolution is always welcome. Be ...

But, there may be features that I feel I need or want. Usability also matters. I recently updated to Sony A7rIV from Sony A7rII after much hesitation. It has a lot of usability improvements. But, ...

That may be a false presumption, there is only a minimal difference in DR between modern cameras and DR does not protect highlights . Underexposure protects highlights . But, underexposure ...

Hi, My take is that many still photographers also do video from time to time, especially those doing paid work. Still and video has a huge common feature set. It is not the way that we can remove a ...

Hi, It could be helpful if you shared some of those files, preferably as 'raw'. Best regards Erik

Hi, With regard to some discussions here, I would point to a small experiment I made like two years ago: https://www.dpreview.com/forums/post/63281139 This was based on the DPreview Studio Test ...

https://www.dpreview.com/forums/post/65520799 Two suggestions: (1) Findings may be viewer dependent (2) Sharpening plays a huge role Best ...