This telescope calculator takes the objective diameter, f ratio, focal length, eyepiece apparent field, and eyepiece focal length as required to calculate the estimated objective performance, telescope magnification, magnification per inch, true field, and exit pupil size. It is a great way to compare the characteristics of different eyepieces. The calculator requires a JavaScript compatible browser.

Using your actual component, our industry experts and application engineers will support you during application development and optimization in the Laser Applications Center – with our extensive portfolio of versatile laser processing systems. We would love to welcome you to our TRUMPF Laser Applications Center in Ditzingen - spanning an area of over 4,000 m², it is one of the largest laser application centers in the world.

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In 1996-1997 as an experiment in using Javascript, I wrote this calculator with a suite of additional pages focusing on eyepieces. At that time, these pages won an award from Griffith Observatory. The eyepiece data has not been updated since circa 2000. You can find my contemporary website at: https://klhess.com

Benefit from our optics for remote welding: using mirrors, the laser beam can be quickly positioned in any specified position within the processing field, or be guided along any path to create different seam geometries.

I have used data published by the eyepiece manufacturer. I have not verified any of these values. You should expect some variation from the published values.

Unless already entered, type a value for the apparent field and focal length, then press Compute. If you change the objective parameters above, you must press Compute once again to update the eyepiece information.

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The BrightLine Weld option for TruDisk lasers offers the option of virtually spatter-free welding, great welding depth with a high feed rate as well as outstanding beam quality.

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We see ourselves as your application consultant and enabler for new production opportunities. You benefit from our consolidated industrial expertise and our decades of experience as a laser manufacturer.

You are flexible as you can easily process different applications with the same tool – and you can also weld remotely with our programmable focusing optics of the PFO range. TRUMPF also has a unique selling point in the market with the green laser for copper welding.

With the TruDisk green continuous wave laser, you can produce copper weld seams of the highest quality, in a process that is practically spatter-free and has a high reproducibility rate. Find out more about the tried and tested TruDisk disk laser technology with green laser light, its advantages and possible applications.

Enter two of the three values for the objective diameter, f ratio, and focal length, then press Compute to calculate the remaining value and the estimated objective performance.

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TRUMPF lasers facilitate the very compact design of modern electronic power and control units. Using the laser precision tool, the internal contacts can be safely welded in a robust plastic housing with one-sided access in a final joining step. Alternative methods such as soldering, spot welding or connectors require a great deal more space for seam points. The laser also makes the most varied types of contactings possible - virtually spatter-free and with no adverse effect on adjacent sensitive components in very confined spaces.

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I have already entered the apparent field for many popular eyepieces from Brandon, Celestron, Meade, Pentax, Tele Vue, and Vixen. You can enter values for any other eyepiece.

Based on the objective diameter, one can infer the following performance for the telescope's limiting magnitude and resolution (all very approximate). Atmospheric seeing limits resolution to approximately 1/2 second, regardless of the objective size. Note that no compensation is made for light loss in the optics or for the quality of the optics. Aperture gain and faintest star calculations are based on a 7mm pupil size and 6th magnitude visibility limit for the naked eye.

Whether a green laser with green wavelength, BrightLine Weld or special sensor systems – TRUMPF offers countless innovative manufacturing solutions for power electronics in electric cars.

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Note: JavaScript does not currently allow the printing of field values. If you want a printed record of your calculations, you must use the Print Screen key which will copy to the clipboard the visible portion of the current window.

As well as the laser source, you will also receive the corresponding consultation services for innovative welding solutions from TRUMPF, for example when welding copper hairpins.

Note: The calculations to estimate the performance of your telescope objective work in units of either inches or millimeters. Unfortunately, the eyepiece calculations require units of millimeters. If you want to do the eyepiece calculations below, then you must use millimeters.

In comparison to screw connections, laser welding external connecting contacts facilitates a much more compact installation of IGBT boards into their surroundings, for example in electric cars. However, it must be ensured when welding these contacting connections that the generated heat input which is sometimes fed into the component's interior, is kept to a minimum. This means that the sensitive electronics are not damaged. This is made possible by the high welding speeds (reduction of distance energy) in combination with the TRUMPF BrightLine Weld technology, which effectively avoids spatter, protecting the component from contamination.

DCB (Direct Copper Bondings) substrates are components for electronic circuits and systems which must be connected with each other in function via contact surfaces. Their specific design (ceramics coated with copper) makes the contact very sensitive as the coating may not delaminate due to thermal load nor may the ceramic itself be damaged. Using the green laser wavelength and the corresponding higher absorption rate in copper, long-lasting electric contacts can be created on the sensitive substrate. The DCB substrate remains completely intact.

TRUMPF image processing detects characteristics on components and ensures that welding is always implemented at the correct location. The operator no longer has to reprogram each weld seam individually with this solution.

As a result of their modular system, TRUMPF processing optics can be adjusted to suit different applications and spatial conditions.

TRUMPF facilitates a multitude of applications within the production of control and regulation assemblies and power converters. For hardly any other tool is better than the laser for processing these intricate and sensitive components for electric cars. Our laser sources are under constant further development, contributing to the improvement of specific joining results, for example in pinpoint contacting in complex and thermally sensitive electronic components. Furthermore, industrially mature high-power lasers with visible wavelengths help ensure that copper contacts in electric cars can be processed more productively and with almost no spatter, also due to their high absorption characteristics.

Our newly developed beam source with visible green wavelength – whether pulsed or continuous wave – welds copper connections with minimum heat input, high reproducibility and with almost no spatter.

You can weld contacts and copper connections with no contact and pin-point precision. You benefit from the defined energy input and can rely on reproducible process results. TRUMPF provides the laser source, sensor system and optics from a single source – offering a customized, turnkey complete package for every welding application in the area of power electronics.

Note: The eyepiece calculator works only in millimeters. Information you entered about your telescope objective (above) must be in millimeters in order to do eyepiece calculations.

Take advantage of a consultation by our experts and our worldwide service network. Whether you need service or application development – we are where you are.

High-strength connections which are also entirely reproducible and have high conductivity can be achieved with non-contact tools.