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Lense for Astro photography


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On 9/3/2018 at 8:31 PM, Defyyy said:

Hey guys,

i want a lens for my a7r2 to make some sick astro shots any recommendations?

i thought about the Sigma AF 1,4/20 DG HSM A Sony FE-Mount



Just a suggestion ... you may want to look into using an old SLR lens with an adapter. When looking at the sky focus is not an issue (everything is at infinity) and fiddling-with-exposure is half-the-fun (and most of the older SLR lenses are relatively inexpensive).

Here, attached, is a picture I took a few days ago from my driveway about 10:30 at night.

Camera        - Sony A7iii 'mirrorless' digital
Lens          - Canon 55mm f/1.2
Exposure Time - 1/60th sec
Aperture      - f/1.2
'ISO'         - 12,800

I used 'IrfanView' and tweaked the gamma to suppress big-city sky brightness and pull-up the stars. (In the future I hope to be able to do some 'dark frame' noise subtraction but haven't learned what software to use yet.)

Best Regards;

- Paul


DSC00068 -p -r.jpg

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On 9/3/2018 at 8:31 PM, Defyyy said:

Hey guys,

i want a lens for my a7r2 to make some sick astro shots any recommendations?

i thought about the Sigma AF 1,4/20 DG HSM A Sony FE-Mount



Here's a picture of the Moon that I took about an hour ago from my driveway (the Moon is so bright that streetlights don't cause any significant problem). It was taken with my Sony A7iii Camera and the Canon FD-series 500mm/f8 catadioptric mirror lens using a purely mechanical lens adapter.

- Paul


DSC00087 -e3.jpg

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7 hours ago, Chrissie said:

That's quite a remarkable result, considering the rather low price of this lens. 

Thanks but it wasn't difficult. The Sony A7iii Camera has an internal 'zoom' feature (somehow not the same as a 'digital zoom') and it allows for a X2 multiplier (I suppose that gave the equivelent of a 1,000mm focal length lens). What's frustrating is that there's a X10 focusing aid multiplier ... with that on lunar features are really visible .... but there's no way (that I know of) to take a photo with that active.

- Paul

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