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Focal length when capturing through eyepiece

Chipela

By Chipela
in Getting Started With Imaging

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Chipela

Chipela

Posted
Posted

A quick question:

How can I calculate the effective focal length of the optical assembly when capturing a photo through eyepiece? By effective I mean the required focal length of an OTA (x barrow multiplier) needed to achieve the same FoV if attaching the camera directly to the OTA.

I guess that it might be (OTA focal length * (camera focal length / eyepiece focal length), e.g. 750mm * (24mm / 4.5mm) = 4000mm but is that correct at all?

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