upsizing from a heavy crop

[weepete]

Hi all, I'm looking for a bit of advice.

My dad is into his photography too though he doesn't get a lot of free time to shoot nowadays. Anyway, for ages he wanted to take a good shot of the moon, so earlier this year we managed to get a biIof free time after work and I got him outside and showed him how to do it and we managed a pretty decent shot.

We took the shot with a Canon 1DX and a 70-300 DO lens at 300mm.

He now would like to get it printed in a decent size but I'm not too sure on how to get the best image quality after its been quite heavily cropped so am looking for a bit of advice on what a good print size would be and how to upsize it?

I'be got Lightroom 5 and Photoshop CC to use

 

[jaomul]

Open a blank file your required sizi in photoshop at maybe 300ppi. Open your moon image and copy, close and paste in. Free transform to size required (bicubic ticked). Photoshop 6 on has improved enlarging alogrithms. We enlarged a 6mp photograph in photoshop to 1 metre wide(for a club exhibition) at 360ppi and it looked great

 

[weepete]

Thanks Jaomul, exactly the kind of advice I was looking for!