Night Focusing

[Ludovico Guarini]

I wonder if anybody has any experience with the concept I explain below. With astrophotography it is important and difficult to achieve focus. The Fuji have a very nice distance scale in manual (and other)focusing modes. I have used that a couple of times to set the focus to infinity. The results seem to have been generally good, but I have no idea if the scale is accurate and would love input from others who may have tried to do the same. Focus peeking in the dark does not work at all in my hands.

Looking forward to comments.

LG

[rzgp33]

On 4/27/2019 at 2:16 AM, Ludovico Guarini said:

I wonder if anybody has any experience with the concept I explain below. With astrophotography it is important and difficult to achieve focus. The Fuji have a very nice distance scale in manual (and other)focusing modes. I have used that a couple of times to set the focus to infinity. The results seem to have been generally good, but I have no idea if the scale is accurate and would love input from others who may have tried to do the same. Focus peeking in the dark does not work at all in my hands.

Looking forward to comments.

LG

The only way to tell it to use a Bahtinov mask

http://www.deepskywatch.com/Articles/make-bahtinov-mask.html

And hope the focus-by-wire wont change on you mid stack. Even when when set to manual focus I have had some issues.

If only they make the  90mm with a real manual aperture ring and real focusing.... sigh

 

 

[sz4]

On 10/5/2019 at 12:19 AM, rzgp33 said:

The only way to tell it to use a Bahtinov mask

http://www.deepskywatch.com/Articles/make-bahtinov-mask.html

And hope the focus-by-wire wont change on you mid stack. Even when when set to manual focus I have had some issues.

If only they make the  90mm with a real manual aperture ring and real focusing.... sigh

 

 

The Rokinon 85mm F/1.8 is an excellent lens and all manual.  I have used it for astrophotogrphy.

[James MacAllister]

I've found that I need to pull back from infinity on the scale just a tad to actually focus at infinity. Try focusing on a distant object in daylight, I think you'll see what I mean.