NikonGear'23

Gear Talk => Lens Talk => Topic started by: Dr Klaus Schmitt on October 23, 2018, 20:53:48

Title: Lyman-Alpha I Experimental f2.8/200mm mirror lens
Post by: Dr Klaus Schmitt on October 23, 2018, 20:53:48: Now this is the older sister of the Lyman-Apha II f1.1/90mm lens I have shown here before.

Today about the Lyman-Alpha I Experimental f2.8/200mm mirror lens, which is much more "tamed"
than its funky sister, but still it allows for some "impressionistic" work:

(https://c2.staticflickr.com/2/1912/45445448882_9164b36830_o.jpg)

(https://c2.staticflickr.com/2/1966/30556518917_400584cd95_o.jpg)

(https://c2.staticflickr.com/2/1905/43679777340_c39b7c29fb_o.jpg)

(https://c2.staticflickr.com/2/1971/43679775070_6be6ef6ed5_o.jpg)

(https://c2.staticflickr.com/2/1946/43679773960_959ace6307_o.jpg)

(https://c2.staticflickr.com/2/1963/45496422931_ee587d0a99_o.jpg)
Title: Re: Lyman-Alpha I Experimental f2.8/200mm mirror lens
Post by: atpaula on October 23, 2018, 22:12:03: Different but interesting and beautiful results.
Title: Re: Lyman-Alpha I Experimental f2.8/200mm mirror lens
Post by: Birna Rørslett on October 23, 2018, 22:13:20: I assume the 200 illuminates a large image circle too.
Title: Re: Lyman-Alpha I Experimental f2.8/200mm mirror lens
Post by: Jakov Minić on October 23, 2018, 23:19:55: Impressive, Dr Klaus, very impressive!
Title: Re: Lyman-Alpha I Experimental f2.8/200mm mirror lens
Post by: Akira on October 23, 2018, 23:25:38: I enjoy the rare combination of sharp main motives and the backgrounds of strong character!
Title: Re: Lyman-Alpha I Experimental f2.8/200mm mirror lens
Post by: Dr Klaus Schmitt on October 24, 2018, 07:38:38: Thank you guys!

Quote from: Birna Rørslett on October 23, 2018, 22:13:20
I assume the 200 illuminates a large image circle too.

I assume the f1.1/90mm was designed for an image amplification system, hence its f1.1
speed. Usually they had (at that time) up to 25mm diameter; I measured about 32mm.
The 2.8/200mm was made for up to 43mm image diameter, i.e. FF so your assumption
is very correct Birna!!

This can be seen here, by the rather even rendering of the BG that f2.8/200mm shows:

(https://c2.staticflickr.com/2/1965/43679776270_3cf9a4f942_o.jpg)
Title: Re: Lyman-Alpha I Experimental f2.8/200mm mirror lens
Post by: Erik Lund on October 24, 2018, 09:56:20: Looks like it is capable of producing instant water color painting looking images ;D Wow quite impressive!
Title: Re: Lyman-Alpha I Experimental f2.8/200mm mirror lens
Post by: Frank Fremerey on October 24, 2018, 11:45:00: much better. more photographic. less nervous in the center of interest. very capable lens in my eyes.

great find!
Title: Re: Lyman-Alpha I Experimental f2.8/200mm mirror lens
Post by: Frank Fremerey on October 24, 2018, 11:46:34: PS: As the lenses are mirror only optics they should be perfect for UV work. did you try UV?
Title: Re: Lyman-Alpha I Experimental f2.8/200mm mirror lens
Post by: Dr Klaus Schmitt on October 24, 2018, 12:53:54: Thank you guys!

Quote from: Frank Fremerey on October 24, 2018, 11:46:34
PS: As the lenses are mirror only optics they should be perfect for UV work. did you try UV?

That's why I originally bought them Frank. Just did a few UV shots today, will post some later here...

[Lyman Alpha is the 121nm deep UV Hydrogen emission line, those lenses were made to record that deep...]
Title: Re: Lyman-Alpha I Experimental f2.8/200mm mirror lens
Post by: Dr Klaus Schmitt on October 24, 2018, 13:45:46: Here a few UV shots, using Baader-U filter (rear mounted)... no sun, rain

Neighbour houses, ca 10-20m away:

(https://a4.pbase.com/o10/08/747708/1/168308589.OZUxgBzu.Nye_200mm_UV_P1740616a_c.jpg)

(https://a4.pbase.com/o10/08/747708/1/168308588.Z3FfaYvL.Nye_200mm_UV_P1740606a_c.jpg)

Lack of CA is quite evident...
Title: Re: Lyman-Alpha I Experimental f2.8/200mm mirror lens
Post by: Frank Fremerey on October 24, 2018, 17:52:07: very nice. High transmission? I guess you get much shorter exposure times than you would with a glass lens?
Title: Re: Lyman-Alpha I Experimental f2.8/200mm mirror lens
Post by: Dr Klaus Schmitt on October 24, 2018, 21:10:04: Quote from: Frank Fremerey on October 24, 2018, 17:52:07
very nice. High transmission? I guess you get much shorter exposure times than you would with a glass lens?

Data states 85-88% transmission for the 190-400nm UV region, not bad at all. But not to forget, there is the
central obstruction which costs quite a bit of light....
Title: Re: Lyman-Alpha I Experimental f2.8/200mm mirror lens
Post by: Dr Klaus Schmitt on December 05, 2018, 15:51:49: Got another such rare mirror only f2.8/200mm lens, this time with built in rear focuser (front rotates)

(http://forum.mflenses.com/userpix/201812/455_Nye_200mm_image1_c_1.jpg) (http://forum.mflenses.com/userpix/201812/big_455_Nye_200mm_image1_c_1.jpg)

(http://forum.mflenses.com/userpix/201812/455_Nye_200mm_image2_c_1.jpg) (http://forum.mflenses.com/userpix/201812/big_455_Nye_200mm_image2_c_1.jpg)
Title: Re: Lyman-Alpha I Experimental f2.8/200mm mirror lens
Post by: Erik Lund on December 06, 2018, 08:06:12: Congratulations Klaus, looks very industrial!
Looking forward to images, there should be possibility to capture that cross mirror bracing in some highlights ;D
Title: Re: Lyman-Alpha I Experimental f2.8/200mm mirror lens
Post by: Dr Klaus Schmitt on December 06, 2018, 14:39:29: Quote from: Erik Lund on December 06, 2018, 08:06:12
Congratulations Klaus, looks very industrial!
Looking forward to images, there should be possibility to capture that cross mirror bracing in some highlights ;D

Thanks Erik, you mean that...?

(https://c2.staticflickr.com/2/1907/43679772750_ec6fc763ac_o.jpg)
Title: Re: Lyman-Alpha I Experimental f2.8/200mm mirror lens
Post by: Erik Lund on December 06, 2018, 15:03:08: That was quick ;)
Title: Re: Lyman-Alpha I Experimental f2.8/200mm mirror lens
Post by: Dr Klaus Schmitt on December 06, 2018, 17:22:06: Quote from: Erik Lund on December 06, 2018, 15:03:08
That was quick ;)

Always...what else ;-)