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Post your Optical Design! (This is a no-discussion thread!)

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#1 Sean Cunneen

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Posted 05 November 2019 - 01:11 PM

This is a place for you to post your optical designs. We think your minds are a fantastic resource and keeping these designs in one spot will make them a resource for generations to come! With that in mind, this thread is for design posting only...  If you would like to discuss the merits of a particular design we ask that you start another thread so this one will be easy to search!

 

When submitting a design, please make sure to include it's name, whether the optic is a primary optic, accessory, eyepiece, etc. Include a description of the design and any supporting data/images you can. 

 

Try to include designs that can be constructed in real-life from available materials. Tony Starks we are not!

 

Finally, please be patient while we figure out best-practices, feel free to hit the MA button if you have any questions or concerns... 

 

Thanks!

 

Your CN ATM Team


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#2 Mike I. Jones

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Posted 05 November 2019 - 08:41 PM

OK, I'll kick it off with some Rosin astrographs in OSLO.  There are going to be so many files it's going to be hard to sift through them all and find something of interest.  Until a better system comes up, I'm going to begin each file name of everything I post with the kind of optical system it is (ROSIN, DK, RC, CLASSCASS, ACHROMAT, APO, MAK-NEWT, MAK-CASS, SCHMIDT, SCHUPMANN, etc.) to make searching easier.

 

Attached File  ROSIN 8f4 1in format.len   997bytes   181 downloads

 

Attached File  ROSIN 10f4 1in format.len   1001bytes   49 downloads

 

Attached File  ROSIN 12_5f4 1_4in format.len   1016bytes   61 downloads

 

Attached File  ROSIN 16_4f4 1_4in format.len   1018bytes   42 downloads

 

Attached File  ROSIN 20_4f4 2_0in format.len   1000bytes   43 downloads

 

Attached File  ROSIN 34in f2_89 Rosin 3LFC.len   1.28KB   57 downloads

 

Attached File  ROSIN 1060mm f3_5 - not bad.len   1.27KB   46 downloads


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#3 Mark Harry

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Posted 06 November 2019 - 10:49 AM

I fiddled around with this a couple years ago. 4 basic elements.
  (edit) All based on the same radius

Attached Thumbnails

  • 5 tetra display jaypeg.jpg
  • 5 tetra spots.jpg

Edited by Mark Harry, 06 November 2019 - 10:50 AM.

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#4 Mark Harry

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Posted 06 November 2019 - 10:54 AM

Those spots are for zero focal plane tilt, and flat field.



#5 Ed Jones

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Posted 06 November 2019 - 12:13 PM

Here's an unobstructed Mak-Chief using commercial correcting lenses. Zero field tilt.

Attached Thumbnails

  • Mak-Chief.jpg

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#6 555aaa

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Posted 07 November 2019 - 01:16 AM

A link to some three mirror anastigmats - note I am not an optical designer by trade.

https://www.cloudyni...escope-designs/

 

from that post (in case it goes away) a 400mm Paul at f/2.8, primary is parabolic, secondary and tertiary are spherical, there is a little singlet flattener.

I actually lost all these design files so I just have the screenshots.

paul400m_f2p8.png

spots

paul400m_f2p8_spots.png


Edited by 555aaa, 07 November 2019 - 01:21 AM.

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#7 555aaa

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Posted 07 November 2019 - 01:24 AM

I think this was someone else's (Vla's I think or I used his excellent reference) design for a Paul-Baker version of the above where the secondary conic constant is about -0.58; there are a family of flat field solutions if you aspherize the secondary.

 

paul_baker_400m_vlad.png

 

spots

paul_baker_400m_vlad_spots.png


Edited by 555aaa, 07 November 2019 - 01:26 AM.

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#8 Ed Jones

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Posted 08 November 2019 - 02:18 PM

The Chief is one unobstructed scope that you can buy the optics and assemble it yourself if you aren't into making optics.  The hardest part is how to hold the lenses.  This is how I do it now and am looking into 3D printing it.  There are many other possible variations on using Chief correcting lenses like th Mak-Chief (above), Honders, Schmidt, RC, and no doubt others.  Check out my web page for more designs.   Here is a 6 inch F/8 design:

 

Attached Thumbnails

  • 6 inch F8.jpg

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#9 Tucker512

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Posted 13 November 2019 - 02:10 PM

Here is 6" tetraschiefspiegler using a stock 6" f/8 parabolic mirror.  Convex secondary and concave tertiary are equal in radius and can be ground and tested against each other; quaternary is a simple concave surface.  Focal plane is flat and is constrained to make the focuser perpendicular to the incoming light path.  Final focal ratio is f/7 and performance is basically the same as the native f/8 primary.

 

Scott

Attached Thumbnails

  • 6 Inch Tetraschief.jpg

Edited by Tucker512, 13 November 2019 - 02:12 PM.

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#10 Mike I. Jones

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Posted 20 November 2019 - 12:30 AM

Attached File  APOCHROMAT 120mm f7_5 N-BK7 S-FPL53 - wild shape.len   1003bytes   86 downloads

 

Attached File  APOCHROMAT 250mm f8_8.len   1.42KB   59 downloads

 

Attached File  APOCHROMAT Jones 200mm f9_6 athermal.len   1.4KB   58 downloads

 

Attached File  CHIEF 10f11.len   1.25KB   41 downloads

 

Attached File  JONES-BUSACK 250mm f3_93.len   1.18KB   52 downloads

 

Attached File  SOLANO MIJ 8f18_8.len   787bytes   38 downloads

 

Attached File  TMA 150mm f5.len   1.48KB   36 downloads

 

Attached File  TRISCHIEF 10f20_MIJ.len   758bytes   34 downloads

 

Attached File  WOLTER-JONES ABB 2.len   990bytes   39 downloads

 

Attached File  YOLO 250mm_f12_8.len   893bytes   51 downloads


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#11 Ed Jones

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Posted 23 November 2019 - 12:07 PM

 8 inch F/9.6 Jones-Medial refractor
   Here is a medial refractor similar to one I built (mine is a 7 inch) that has a singlet objective lens, a mangin lens B, a weak convex mirror and field lens.  As a medial it is in the same family as a Schupmann but much better corrected.  It is diffraction limited across the full visible spectrum.  Compared to a Schupman it has a wider 1 degree field, the field has no tilt, it has no optics near focus sensitive to dust and is only about 65% as long.  This one has a lens separation of only 45 inches.  The image is near mid scope so it works well on a Dob mount or GEM.  I started out tilting the Honders design, added a weak convex mirror to correct field tilt and Chief correctors to correct the tilt.  However Zemax found that only one lens was needed to correct both tilt and lateral color.  Other crown glass can be used for the A & B lens (I used K5) but A & B need to be the same glass preferably same melt. I used a commercial BK7 field lens even with the K5 lenses.  This design has an Opto-Sigma lens.
 

 006s.jpg

Attached Thumbnails

  • 8 inch Jones-Medial F9-6 layout.jpg
  • 8 inch Jones-Medial F9-6.jpg

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#12 Benach

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Posted 24 November 2019 - 07:22 PM

Another Mike Jones design. Am currently persuing to make this telescope. Mirrors have been made, glass of the front corrector is bought via another CN member and will be grinded and polished next year. CAD design of the telescope is finished years ago (although I have said that ages ago as well). Please note the extremely thin secondary mirror. This is real!

Attached Thumbnails

  • Zemax data.jpg
  • Spots.jpg
  • Layout.jpg

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#13 Benach

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Posted 25 November 2019 - 05:40 PM

To show the latest version in a CAD screendump, here's an impression. Questions: feel free to PM.

Attached Thumbnails

  • Kijker.JPG

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#14 lylver

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Posted 24 December 2019 - 08:52 AM

Small achromat CGDM glass

Attached File  TheFlammarion-small-cemented-80-1200.len   596bytes   38 downloads

Planetary

TheFlammarion-strehl-s.jpg

Deep Sky

TheFlammarion-DS.jpg



#15 lylver

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Posted 28 December 2019 - 02:05 AM

From mesured AK70 cemented littrow objective. Need cell to focuser collimation for better planetary sharpness.

This is a flat back littrow : textbook r1=r2=r3, flat r4. Easy to reach high strehl.

AK-70b.jpg IMG_20190211_211331.jpg

Attached Files



#16 Ed Jones

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Posted 03 January 2020 - 01:05 PM

Here is a Jones-Yolo (Jolo) for Mark.  It uses 2 Newport lenses +/-200 mm focal length, 2 inch diameter to correct astigmatism instead of a toroid. 

 

design.jpg

 

6 inch F12_5  Jolo.jpg


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#17 BKSo

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Posted 21 January 2020 - 03:14 AM

80mm F3.75 APO
 
*LENS DATA
ED retrofocus quartet
SRF      RADIUS      THICKNESS   APERTURE RADIUS       GLASS  SPE  NOTE
OBJ       --        6.0000e+20    3.6698e+19             AIR   

  1        --        110.000000     42.000000 K           AIR   

AST   -99.730000     11.000000     40.000000 A         N-BK7 C 
  3   -138.730000      1.000000     41.949893 S           AIR   *

  4   -270.930000     13.500000     42.062252 S         N-SF2 C 
  5   -178.100000     45.700000     43.807681 S           AIR   *

  6        --          9.500000     46.238445 S       N-KZFS4 C 
  7    132.340000      1.000000     46.551008 S           AIR   *

  8     98.190000     24.000000     46.821102 S       S-FPL53 C *
  9   -138.340000    321.408682 V   45.000000 K           AIR   *

IMS  -427.549987        --         18.349466 S                 

*CONIC AND POLYNOMIAL ASPHERIC DATA
SRF        CC          AD          AE          AF          AG
  8    -1.1918e+00      --          --          --          --

 

Plan
Plan.png
Spot
Spot.png
CA plot
CAPlot.png

 


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#18 lylver

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Posted 29 January 2020 - 09:05 PM

Idea for a 102mm / 1000mm Baker type. r2=r3 richfield achromat optimized for Deep Sky and Moon. Nice in H-alpha too.

Looks like what Bresser do on some wide air gap achromat. (2.5mm gap)

Spot on color range : 515nm-610nm, yellow-green centered, high contrast between e ray to D ray.

Baker-Moon-515-610.jpg

Attached Files



#19 Mike I. Jones

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Posted 12 February 2020 - 11:24 PM

20" f/12 3-element all-spherical Corrected Argunov. Field is 2" x 2" to accomodate larger CCD arrays. Spectral correction 0.4-0.9µm.

Too many surfaces for OSLO-EDU or Synopsys, Zemax file attached.

20in f12 3L Arg + 1L FC  layout + scrip.jpg

Attached File  20in f12 3L Argunov + FC 2in square FOV 0_4-0_9um NO MF.zmx   7.66KB   32 downloads

20in f12 3L Arg + 1L FC  spots.jpg


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#20 Mike I. Jones

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Posted 12 February 2020 - 11:25 PM

MTF curve for 20" f/12 all-spherical Corrected Argunov.  Pretty much DL. No tolerances, just showing the baseline design.

Mike

 

20in f12 3L Arg + 1L FC  MTF.jpg


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#21 Mike I. Jones

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Posted 13 February 2020 - 11:01 PM

6" f/11 corrected Klevtsov in OSLO.  Format is full-frame DSLR.  A thick meniscus near the primary vertex does a nice job of cleaning up the imagery.  More of a curiosity, not very practical in larger apertures.

 

Attached File  6in f11 corrected Klevtsov.len   1.4KB   33 downloads

 

6in f11 corrected Klevtsov layout.jpg


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#22 lylver

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Posted 17 February 2020 - 04:03 AM

The 6" Clavé planetary refractor objective original design by Jean Texereau. A 4" has been mesured 0.992 strehl with lambda/9 PtV

Attached Thumbnails

  • Clave-150-f15-planetary-s.jpg

Attached Files



#23 djgilley

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Posted 14 March 2020 - 04:21 PM

A 10 inch semi-apo triplet using a short flint middle element (NBM-51) and an ordinary flint (TIM-28) for the rear element. Wavefront error .311 in blue, .426 in red, and .854 in violet) with R1= -R2, and R2=R3. 

 

10 inch F14

 

Attached Files



#24 Mike I. Jones

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Posted 16 March 2020 - 11:55 PM

There was a recent discussion here about using COTS negative achromats with a 10" f/4 primary.  This design uses an off-the-shelf Edmund 63767 negative achromat with -150mm EFL.  It raises the system f/# to f/10.8, and gives fairly sharp imagery over a 30mm diameter FOV and 0.47-0.665µm wavelength band.  The negative achromat must be oriented as the attached OSLO-EDU file shows to work well.  There is a lot of tangential astigmatism in the imagery, but the blur circles are less than half that of a 10" f/4 paraboloid over the same FOV.  The primary is figured to a conic of -0.888243, a figuring strength of 88.9% that of a paraboloid.

 

Attached File  10f4 with Barlow to give f10_8.len   1.18KB   19 downloads

 

10f4 + Edmund 63767 to give f10_8 scrip.jpg

 

 

10f4 + Edmund 63767 to give f10_8 spots.jpg

 

Attached Thumbnails

  • 10f4 + Edmund 63767 to give f10_8 layout.jpg

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#25 djgilley

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Posted 26 March 2020 - 08:28 PM

The inspiration for this design comes from the Roger Ceragioli article on the old ATM website, it was in chapter 4b. His design used BK-7, FPL-53, F2, and BaF4 and had a wide airspace between the 2 sets of elements. For my design I used a few common glasses, BAL-14 with PHM-52,  and TIM-2 with NBM-51. Because of the F/C color crossing the way it does it doesn't correct for violet quite as well as a true APO, but I doubt it would be noticeable naked eye since the blur is only 1 and a half times as large as the airy disc.

 

6 inch quadruplet

 

 

 

 

Attached Files


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