Back focusastrophotography

2011102 — According to this reasoning, longer focal length leads to increased depth of field. But in reality, longer focal length leads to decreased depth of field!

ASI183MCback focus

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55mmback focus

A star diagonal for eyepieces or an extension tube for cameras can resolve the issue in a refractor but resolving insufficient inward travel in a reflector is sometimes impossible without making big alterations to the telescope.

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SCTback focus

P Lassègues · 2023 · 9 — The authors study the loss of light coherence when scattered by a macroscopic atomic cloud of cold neutral atoms through intensity-intensity ...

Focal reducerback focus

Back focuschart

Backfocus refers to the distance of the focal plane from the end of the eyepiece drawtube and it is critical that the telescope’s focuser has sufficient travel both inwards and outwards to achieve focus with either an eyepiece or a camera.

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Newtonian reflectors often suffer from insufficient inward focuser travel to allow a camera to reach focus, while refractors manufactured for portability with short optical tubes result in insufficient outward focuser travel.

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Telescopeback focuscalculator

The shorter your focal length, the wider your angle of view will be – so an 18mm lens will give you a wider image than the same lens zoomed to 55mm. As a basic ...

This light microscope is equipped for bright field (transmitted and reflected), phase contrast, transmitted and reflected polarization, Nomarski differential ...

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