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OSLO简单使用介绍

OSLO ANALYSIS

I am going to discuss the different types of optical analysis which OSLO has available. I will try to explain how to use OSLO. I recommend the book Telescope Optics by Rutten and van Venrooij as a good place to learn about optical design and aberrations. This book is published by Willman-Bell.

I cannot take the time to explain all about each aberration or type of analysis. But, I will comment briefly about several of these as they apply to an amateur telescope

designer. The spot diagram is probably the best overview of optical performance, but there are other important things to look at also. Ideally all aberrations should be minimized, but often there are trade offs to be made. I will try to comment on some of these. How good is good enough? This question is not so easy to answer. A lot depends on your priorities and what trade-offs you are willing to make. The best way for an amateur to start answering this question may be to compare your design with another good design. The atm_free Yahoo group has some good files in the OSLO sample files. These are listed in the Files section.

In general, a long focal ratio telescope will have smaller aberrations than a shorter focal ratio design. There are exceptions to this, but it is true most of the time. For example, a short focal ratio refractor will have more color errors than a longer focal ratio design, if they are made from the same glass types. One way to minimize chromatic aberration is to use more expensive glass types. This is a trade-off that some people will make, but not everyone. Part of the reason the more exotic glasses are expensive is that producing excellent quality glass is much more difficult. And a refracting telescope objective lens needs to have very good quality glass in order to get good images.

Let's start by making a refractor design. This will be a 100mm f/5 doublet lens. The glass types are available and relatively inexpensive. This design would make a nice finder scope on your big telescope. This is a fast focal ratio design, so there will be a lot of chromatic aberration. A lens like this should work fine for low power observing, as would be the case for a finder telescope. This design would not work as well for high power viewing as a 4" f/12 design.

I have shown how to create designs in a previous OSLO How To page where I talked about data entry. Please refer to these if you don't know how to set up a new design.

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