I'm not a soft-focus photographer, but I appreciate the effect. That's really nice asiuilin!
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I'm not a soft-focus photographer, but I appreciate the effect. That's really nice asiuilin!
Bravo !Quote:
Originally Posted by asuilin
How did you make that ring appear? I've never seen flare like this :)Quote:
Originally Posted by neprosti
Of course, I did not grinded the glass. It's too much even for crazy Russian :)Quote:
Originally Posted by AtlantaTerry
Optic for this lens (multicoated plastic) was ordered in ophthalmologist shop. It is just the blank for eyeglasses manufacturing.
There are three important parameters for meniscus:
- diopters - affects focal length
- lens curvature - affects balance between corner sharpness and astigmatism aberration (astigmatism, in turn, affects bokeh smoothness).
- distance between the meniscus and diaphragm - affects amount of coma aberration. The more coma, then more "swirly" the picture. I dont' like swirl, so trying to minimise coma in my designs
The rough design was calculated in WinLens and tuned by trial and error. If you want, I can write detailed post in "DIY" forum.
This is a photos of 167mm meniscus:
Attachment 108749Attachment 108750Attachment 108751
It looks and works like a modern lens. No PVC tubes, no waterhouse stops, no old junk. Diaphragm controlled by shutter, as usual.
Yellow-green filter is a part of lens design, it reduces chromatical aberrations (more sharp picture).
That would be interesting :)Quote:
Originally Posted by asuilin
I imagine the lens is the two close up lenses between the shutter and the skylight filter? So it is a two element lens?
simple, you need to directly in the sun and a small aperture
(in color it looks better)
No, it's classical one element meniscus, lens behind aperture. There is no optical element in front, only YG filter to reduce chromatism and protect shutter.Quote:
Originally Posted by Ramiro Elena
Yes, please do.Quote:
Originally Posted by asuilin
Really great result! That "look" is much prettier and more refined than almost any other meniscus lens that I have seen. If you had a bunch of those made up ready to go with threads for a Copal shutter, I would be first in line to buy one.Quote:
Originally Posted by asuilin
Thank you for kind words, Corran!
The hardest part of lens assembly is a threaded adapter to screw step-up rings into Copal shutter. Adapter should be custom machined and I had difficult times trying to find reliable machinist in Moscow. It was much easier to produce these damn adapters in China than here.
If I have a chance to make more adapters, I'll let you know.