Simulation of Airylab f/27 telecentric in near-UV

[christian viladrich]

Hi,

I don't have any images to share there, but only the results of optical simulations.

I was wondering how the Airylab f/27 telecentric performs when used in Ca K or H, instead of the designed Ha wavelength.

Because I am limited to 10 surfaces in OSLO, I've done the simulations for a Mewlon 250 :

[url]file:///C:/Users/user/Documents/astro/0-site/astro/instrument/sensitivity/Mewlon/Mewlon250-telecentric-f27.jpg[/url]

The results are quite interesting, the telecentric is doing good in Ca H et K, and even slightly increases the diameter of the diffracted-limited flat field.

At 400 nm, without telecentric, the radius of diffraction-limited field is 0.31°, while it is 0.37° with the telecentric.

At 653 nm, without telecentric, the radius of diffraction-limited field is 0.51°, while it is 0.58° with the telecentric.

This is valid only for very narrowband filters.

Last year, I did an actual test with the TOA150, and optical quality with the Airlylab telecentric was excellent in Ca K.

[marktownley]

I've found the Airylab telecentric to be excellent in CAK

[Bob Yoesle]

Hi Christian,

Since AiryLab is no longer making anything, I would be interested in the Baader TZ3 simulation results, as it is specifically designed for both Ha and CaK use.

Best wishes,

Bob

[christian viladrich]

Hi Bob,
Unfortunately, I don't have the design of the TZ3, so I can't make any simulation.

BTW, the correct link to the Airylab telecentric simulation with the Mewlon 250 is this one (see bottom of the page) :

http://astrosurf.com/viladrich/astro/in ... sis-DK.htm

[mdwmark]

Hi ,
OK, Bob talk about the TZ3. I know that the telecentric used in the SunDancer2 is corrected from Ha to K-line. You can get this telecentric by its self.
Its has an 11/4" front and the back has an male T thread. It is in there add.
Mark

[antonello]

Christian,
if you want to test a good self made telecentric, try this project of mine. I made it and it works great (3.3X). By changing the position of the three lenses it is possible to have all magnifications from 2X (if I remember correctly) to 5X. In the image, at the top, the spots relating to the 400 nm wavelength and, at the bottom, at 656.2 nm.
The optical simulation is relative to a 100 mm f:10 "perfect lens". I also did simulations with a 100 mm real achromatic objective (Edmund) and the result was not very different, with star points always inside diffraction disks.

telecentrico_3.3x.jpg (277.25 KiB) Viewed 1431 times

[Dennis]

On the Baader website i read that the TZs are optimized for h-alpha, but they can be used in CaK too, but there they are only diffraction limited (Strehl 0.8) . So i wouldnt use it for CaK.

Is a telecentric design actually needed or of advantage for this purpose? For now im pretty fine with barlos. But i would love to get some that are optimized for 393nm.


https://www.baader-planetarium.com/de/r ... eite).html

[Bob Yoesle]

The Baader Research Grade TZ3 (German language text above) is also pretty good with a 0.8 Strehl at 393 nm, which IS diffraction limited, and likely better than the preceding optical components - and generally better than what the atmosphere allows for ;-)

Bob