pdmphoto wrote: keepcoding wrote:
I am still experimenting a bit with extension tubes and close-up lenses.
With a Marumi +5 the max. magnification increases to ~0.45x and sharpness remains quite high.
Subpixel layout of my computer monitor, at F2.8:
And here is another comparison, at F5.6
Please ignore the different colors between the samples, forgot to lock the white balance.
I find that off center is where close-up lenses do poorly. How are the edges of the frame for sharpness/contrast?
That is true, but the question is how important is edge sharpness for macro...
Fred Miranda wrote: pdmphoto wrote: keepcoding wrote:
I am still experimenting a bit with extension tubes and close-up lenses.
With a Marumi +5 the max. magnification increases to ~0.45x and sharpness remains quite high.
Subpixel layout of my computer monitor, at F2.8:
And here is another comparison, at F5.6
Please ignore the different colors between the samples, forgot to lock the white balance.
I find that off center is where close-up lenses do poorly. How are the edges of the frame for sharpness/contrast?
Same here. I find that I need to step down the 50/2 APO to f/4 for great off-axis performance. (Still not as good as CV 65/2 APO wide open)
I prefer using an extension tube with the CV 50/2 APO.
The extension tube image is slightly softer, but shows less CA towards the edges.
The achromat also introduces some field curvature, making it almost impossible to get a flat surface entirely into focus.
