Author Archives: momdude

On Wednesday night, two nights ago, there was a pretty nice ISS pass scheduled. On the one hand, it was the last good one for a while. On the other hand, it was partially cloudy with a storm moving in and WINDY AS HELL!!! By which I mean that when setting up I twice had to grab the tripod to keep it from going over, and it was set firmly on level ground, not on a slope or with any other issue. And it’s not a cheap, flimsy tripod either.

I wasn’t at all sure that I would even see the ISS at all and I wasn’t having fun out in the wind. But I just (finally!) got some really great results in capturing the ISS, so I wanted to see if I could duplicate them. So, what the heck? Try it! What have I got to lose, right? Disc space and memory are dirt cheap, it’s not like I was shooting on film. So, holding down the tripod with one hand, triggering the remote with the other, hoping that the wind and my holding down the camera wasn’t jiggling everything too much, I set out to see if I got lucky.

Blow that sucker up to full sized to see it in all its glory. ISS is coming from the lower left (you can see it just starting to clear the horizon, actually in the bare branches of the tree across the street) toward the upper right through the cross of Cygnus. If you look at it full-sized you can also tell which way is north by comparing the start trails (almost five minutes long) on the left and on the right. North is to the right – the star trails there are much shorter since they’re near the pole.

Swinging around to the north, we see the ISS fading toward the horizon and fading to black in the very last frame. And speaking of star trails (there’s only about a minute’s worth in this picture) that bright star right near the start of the ISS trail is Polaris, the north star. It’s not trailing at all, because as the Earth spins it appears to stand still in the sky. But all of the stars around it will trail, some that way, some this, all in a circle around Polaris.

Another thing I noticed:

In this individual frame the ISS is crystal clear, as is the roof on the house across the street, and the telephone pole on the left. The image is in focus. But those tall palm trees in the lower center? Nope, they were whipping all over the place during this five-second exposure and they’re blurry as hell.

Ditto for this single frame looking north. Telephone pole and our roof in good, sharp focus. The cedar trees were having and E-ticket night with those winds.

I guess that I’m glad I gave it shot!

This came out SOOOOOO GREAT!!

Okay, following the near heart attack from today’s Chiefs playoff game (if you don’t know or care, our MVP All-Star got injured, we won anyway but it was close) and “everything else,” I noticed that there was a nice ISS pass tonight. And it was clear and a million. Time to play with the wide-angle lens.

(Image from Heavens-Above.com)

Rise in the southwest, well after sunset, nice and high and bright, right past the shoulder of Orion, fade to yellow-orange-red-dark as the ISS goes into night right next to Castor and Pollux in Gemini.

So, first of all, the wide-angle lens. Unlike the telephoto lens (70-300 mm) and the replacement normal lens (I got it a couple years ago when the 15+ year old original lens started to break down – 18-55mm zoom just like the ones that normally ship with the Canon DSLRs) this one has a great reputation for astrophotography since it has a very well calibrated hard stop to focus at infinity. If you need the back story, look back through the astrophotos here for the past year where I’ve whined and bitched about how the focus for astrophotography on the other two lenses can be a crap shoot. It’s been very frustrating.

I used the telephoto for all of the Great Conjunction photos and I’m at least at a truce with it where I can make it work. But that “normal” lens? What a pain. It was time to try out this wide-angle lens.

Oh. My. God. I might just be in love.

Here’s one 5-second exposure from the sequence. The ISS is that streak departing the frame at the upper left after having entered right by the telephone pole in the lower right. The bright white light in the middle right is the moon. Just below the center right of the picture is the idiot streetlight, along with all of the lens flares coming up from it. And just above the light is a streak from a jet coming out of LAX.

But blow it up – click on the image to see it full sized. See how all of those stars are perfectly in focus pinpoints??!!! Just off the left edge, partially in the tree is Orion. You can even see that the middle star in the “sword” is a nebula, not a star. Just above and to the right of the ISS streak is the “V” of Taurus, and above and to the right of that is the Pleiades cluster. (I can also see the next thing I need to work on to improve the image even more, but I’ll leave the details for later. Let’s just say that I’ve never had a series of images so good that that particular flaw was visible, but now that I do I’m pretty sure I know how to get rid of it…)

I am very pleased!

Then I put 39 consecutive 5-second images together using StarStax…

BLOW IT UP AND SEE IT IN ALL OF ITS GLORY!!

There’s the ISS coming from the lower right to the upper left, and that outbound LAX jet coming from bottom to top. The moon and stars are all trailing since they got picked up on every single image over the course of three minutes and fifteen seconds and the planet was rotating. But LOOK AT HOW SHARP THOSE STAR TRAILS ARE!!

So, this is something I like a lot. At the same time, it points toward the next steps.

First, fix that little issue with the nature of digital cameras, fairly easy, and I’m pretty sure I can do it in Photoshop. I’ve seen the tutorial, I just have to find it again.

Secondly, mount the camera on the telescope now that I have it working again also. Not to use the telescope as a honkin’ huge telephoto lens, not at all what’s needed for this application. I need that wide-angle view! But mount the camera on the telescope and then have the equatorial mount compensate for the Earth’s motion while I’m taking the 3+ minutes of images, so all of those star images line up. The last time I did that and had it working I was using my Olympus OM-1 camera and shooting on slide film.

This might be the end of some of the frustration and the start of some fun!