Lyman-Alpha II Experimental f1.1/90mm mirror lens

[John Geerts]

Yes, love it.

Is such a lens easy to 'reproduce' ?

[Dr Klaus Schmitt]

Yes, love it.

Is such a lens easy to 'reproduce' ?

If you are willing to grind mirrors and have them coated, sure ;-)

[Dr Klaus Schmitt]

Btw. here is a video I took a while ago using this lens: https://youtu.be/9H2xTk7z7rI

[John Geerts]

    Thanks for the link. Really looks 3 dimensional.

[Termite]

Thanks for the video! I'd like to see you walk down a street with this lens, to see what it would do to houses and people.

[Dr Klaus Schmitt]

Thanks for the video! I'd like to see you walk down a street with this lens, to see what it would do to houses and people.

Difficult, as DOF is razor thin, and I don't have a follow focus...

[Termite]

Difficult, as DOF is razor thin, and I don't have a follow focus...

Ah, I  meant what houses and people would look like if you shot them similar to the pictures above.  I wasn't expecting perfect follow focus   

[Dr Klaus Schmitt]

Ah, I  meant what houses and people would look like if you shot them similar to the pictures above.  I wasn't expecting perfect follow focus   

Have a look, here is some in there: https://www.flickr.com/photos/kds315/albums/72157702692038345

[Dr Klaus Schmitt]

Amber tree (aka American Sweetgum) in late autumn

[Robert Camfield]

Klaus,

Very, very interesting...I don't have a sense of the optics, and why the out-of-focus areas are rendered circular, rather swirl-like.

Thanks much...Robert

[Dr Klaus Schmitt]

Klaus,

Very, very interesting...I don't have a sense of the optics, and why the out-of-focus areas are rendered circular, rather swirl-like.

Thanks much...Robert

It is this special mirror lens construction which causes a bent field, as there are no field flatteners, as in other mirror lenses.

[Dr Klaus Schmitt]

Its does UV, too. A rather "unfriendly" comparision of its f1.1 to the UV Nikkor 105mm at f4.5 (left) [UV-Nikkor 105mm with Baader-U front filter, Lyman Alpha II with rear UG11+S8612 filter stack]

[Robert Camfield]

Klaus,

Thanks for clarifying the point regarding the bent field...The comparison with the Nikkor - an orchid perhaps - provides further evidence of the capabilities of the UV 105.

Tks, Robert   

[Dr Klaus Schmitt]

Klaus,

Thanks for clarifying the point regarding the bent field...The comparison with the Nikkor - an orchid perhaps - provides further evidence of the capabilities of the UV 105.

Tks, Robert

Indeed it does, yet those mirror lenses also have their merits, as there is no focus shift over a very wide field, deep-UV to far-IR for instance and there are quite longer focal lengths available, too. And not to forget their high speed (low f-stop) like this f1.1 lens (effective about f1.4 due to the central obstruction)

[Frank Fremerey]

Its does UV, too. A rather "unfriendly" comparision of its f1.1 to the UV Nikkor 105mm at f4.5 (left) [UV-Nikkor 105mm with Baader-U front filter, Lyman Alpha II with rear UG11+S8612 filter stack]

I do understand right: there is no aperture mechanism to create a comparable DOF? can it be built into a shutter with aperture mech like a Copal?