Home made lens, why it glows?

[nick_cool]

I wonder why I can not get a relativelysharp image with no glows with this home made tilt shift lens.


I am using a Samyang 28mm f2.8 lensplus a plastic divergent lens in the back.


I used successfully this plasticdivergent lens with a Fujinon 28mm f3.5 lens, getting sharp imageswith no « glows »


Do you have any idea about what can begenerating the glow and the lack of sharpness?


Cool shots!


PS bokeh is quite big and extraneouswith this lens

[BKSPicture]

I have no idea but that could be a nice effect for some images

[looneyhans]

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[Petrochemist]

I've had similar effects from removing the rear group from a spare lens. In my case I believe it was down to spherical aberration, the correction from the rear group no longer being present.
Stopping down quickly reduced the effect, so that within a couple of stops it was no longer noticeable.