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UK Elliot Scientific Limited Unit 11 Sandridge Park, Porters Wood, St Albans, AL3 6PH TEL. +44 (0)1582 766 300 sales@elliotscientific.com United Kingdom

Focal Length 25mm F2.0 Middle Wave Infrared Germanium Lens For 640x512-15um Detector offered by China manufacturer Nanjing Rising Opto-Electronic (s) Co., ...

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F ratio is usually indicated with a designation and number such as f/3.9.  Simply put, this is an indication of the light gathering ability and the speed of the telescope.  The smaller the F-ratio, the more light gathering ability the telescope has or the faster the optic is and the brighter the target image will be for a specific exposure time.  The larger the F-ratio, the less light gathering ability it has or the slower the optic is and the dimmer the target image will be for the same specific exposure time.

IVS TV. Basler is a leading global manufacturer of digital cameras for industrial applications, medical devices, traffic systems, and the video surveillance ...

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In Crosshairs, the second novel by Toronto writer and playwright Catherine Hernandez, the distinction between dystopia and reality becomes increasingly ...

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BS Van Gosen · 2014 · 111 — Until recently, the rare-earth elements (REEs) were familiar to a relatively small number of people, such as chemists, geologists, specialized materials.

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M109 (https://app.telescope.live/click-grab/all?target=m109 ); Telescope Live 1-Click Observation Data, Processed using PixInsight by Reggie Jones

To illustrate this, I have 2 telescopes I regularly image with using the same camera; one telescope is an Orion 8 inch (203 mm) newtonian astro graph that has a focal ratio of f/3.9.  The other telescope is an Astro Tech AT125 EDL (125 mm aperture) that has a focal ratio of f/6.95.  The Orion 8 inch newtonian astro graph is 3.2 times faster than the refractor.  So, the data I can get using 60 second exposures on the Orion telescope will require 192 seconds on the Astro Tech refractor to collect the same data.  In this case, I can get 3 exposures on the Orion (60 per hour of imaging) for every single exposure on the Astro Tech refractor (~19 per hour of imaging).

Magnification Formula. The magnification formula is crucial for quantifying how much larger a lens makes an object appear. It is expressed as m = 1 + D f , ...

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Parabolic Reflector ... This 30 cm parabolic reflector is precision polished and made from 0.04" thick aluminum. It has a 0.75" center hole and mounting rim.

So, what does this mean for us astro photographers?  Faster F-ratio telescopes will allow you to collect more light in less time.  The consequences of this is that you will be able to get a lot of data by taking shorter sub exposures with a faster F-ratio.  Since you don’t need to take longer sub exposures, the imaging run will be less demanding on your mount and your auto guiding system.

Manual linear translation stages are designed to provide precise, high-resolution travel over any combination of the three linear degrees of freedom. More importantly, however, they constrain any form of movement in the other angular or linear degrees of freedom: pitch, yaw, roll, as well as x-, y-, or z-axis translation.  They are frequently used in applications such as microscopy, metrology, optical fiber alignment, optical delay lines, interferometry, or wherever exact linear position is required.  Industries that utilize linear stages include research, bio-medical, life sciences, astronomy, metrology, semiconductor, and more.  OptoSigma offers the largest selection of linear translation stages to meet virtually any application.  For example,  we have the most bearing options of any manufacturer, including  EXC™ precision bearing, ball bearing, crossed-roller bearing, linear bearing, and dovetail bearing.  Additionally, they are available in materials ranging from brass, aluminum, tool steel and stainless steel. If one of our many catalog stages does not meet your requirements, send us a request for a custom stage.  OptoSigma is, after all, the industry leader in translation stages.

The last item I’ll mention is that you are able to change the focal length of your telescope through the use of focal extenders or focal reducers to adjust / improve the characteristics of your telescope which in turn will affect the F-ratio.

One of the major characteristics we look for when buying a telescope to use for imaging is what the F-ratio of the telescope is.  The best and most comprehensive treatment of this topic is from the Sky Watcher Webcast, “Understanding F Ratio” (that I encourage anyone struggling with this topic to watch.  What follows is a brief summary of that talk.