126 replies to this topic

[sd_1337]

Since it is 0.4 stop darker than the standard ND5 filter assumed by SEM, you can just lie to it and tell it your focal ratio is 8 or 9 instead of 7.1.  Then it will give you 0.3 or 0.6 stops more exposure, to make your image brighter.

 

The above only works if you use an F7.1 scope or a camera lens that has an aperture ring (set to F7.1).  If you use a camera lens whose aperture is only controlled by the camera, you need to change the F number in the script back to F7.1 but not changing the ISO and exposure times.

Thanks so much all, this really helped. I was able to proceed and test. I used your script as a reference whwang. Curious why you haven't done any bracketing or don't have diamond ring part of your script? Or was the one you posted a partial script on your end?

 

Also, I am on a Z62, I am unable to get Continuous H extended that will allow me 14 fps, the max it goes is till the Continuous H which is 5.5fps. Appreciate any help at the last min!

[whwang]

Hi,

 

Unfortunately I can't help on the CH part.  

 

I did not have the diamond ring component because I believe the diamond ring is just way over-exposed Baily's Beads (plus the inner corona).  I tried it in 2017, and the sky was clear.  My simply over-exposed Baily's Beads does not look like a diamond ring at all, and it looks ugly.  Over the past many years, all "pretty" photos of diamond ring I saw have clear optical aberration or have clouds.  So this time I decide to remove it.  It's not my taste.

 

For the corona, I do bracket.  I have at least three different exposure times.  They should encompass a good dynamical range.  And for each exposure time, I will have several tens of them.  Stacking them should further add at least 2 (likely 3) stops of dynamical range.  In 2017, I arranged many different exposure times and I could get only a handful exposures for each.  This time, thanks to the new high-speed cameras, I took the opposite approach: very few exposure times, but many exposures for each.  Judging from other nice examples showing up in recent 4 years, I believe this is the right approach.

 

Cheers,

Wei-Hao