# Difference in viewing stars with binocular and a zoom camera?

Started Sep 14, 2013 | Questions thread
Re: Difference in viewing stars with binocular and a zoom camera?

hassannabeel wrote:

How will the magnification of a binocular with 8x or 10x zoom and 50MM aperture compare to lets say Fuji X-S1 with 26x zoom range?

A binocular with a 10 X means it will magnify the image 10 times larger than your eye alone would see it .

A binocular with a 8 X means it will magnify the image 8 times larger than your eye alone would see it .

Some binoculars do zoom but you can not use the zoom ratio to determine the image magnification . for that you will need the actual magnification when the binocular is zoomed to its greatest magnification . Some are 10x . some are 20x this is the magnification presented to your eyes .

The Fuji will zoom out to an equivalent lens focal length of 624mm .

In this equivalent focal length of 624 you need to know what the magnification presented to your eye from the camera viewfinder will be at the 624mm zoom limit .

Using the equivalent lens as their reference the normal focal length is usually about 50mm but this would not actually be exactly zero magnification with most cameras .

It is usually lists as .8x or .7x magnification for cameras , It could be .9 x .

So you need to divide the 624mm by the 50mm to find a magnification of the camera .

Then you need to multiply the 12.48 times the .7 x of the view finder magnification .

This is 12.48 x .7 x which equals 8.736 x for the camera with the lens at the long end of the zoom . ( 624mm )

Don't rely on this to be precise because we just guessed at the viewfinder magnification ,

( the .7 x ) . and it also depends on the lens focal length where the .7 X is specified .

We guessed the equivalent of 50mm that may not be exactly accurate .

But the pictures from the camera can be viewed at a much higher magnification than the viewfinder or the LCD will display them . The limit will be the sharpness of the image being viewed .

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