I don't see any long exposure threads and I just recently started dabbling in it. Constructive criticism would be appreciated.
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>>2819892
from the summer
>>2819898
How are star trails made? Is it a series of photos merged together? I've always wondered.
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>>2819907
bulb mode long exposure. Basically take an hour long photo. the earth rotates, so all the stars smear the same way lights and people do when you shoot too low a shutter speed.
>>2819945
I figured, but wasn't sure. So like ISO 100 and and an f-stop of like 32 or higher? Otherwise too much like and overexposure right?
>>2819945
Your camera won't overheat after an hour?
>>2819892
i have a question about long exposure: How is the lighting always good when you expose the picture for like 6 hours. How does it adjust for the light change?
Any tips or criticism?
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>>2819983
Looks like film from that photo. For digital, I guess you'd shoot ISO 50 and f/32 with ND and layer photos together,
>>2819980
check the exif on this one, 430 seconds at 100 ISO, with a mostly full moon behind me. F/4.
my babby's first aattempt with startrails. Woulda gone longer but I was also paranoid of overexposing.
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>>2819992
That's why I asked about star trails. Haha. Never tried it. But I assume ISO 100 and super high fstop.
>>2819995
I guess usually when I shoot, there is either the moon or another light source, but without that, I guess I would have a harder time over exposing. I just need to get a remote. Like I said, I just started with long exposure so I haven't done anything more than 30 seconds.
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Here's something I shot on the way home from work a couple of days ago.
>>2819995
StarStax is the way to go. No super long exposures.
>>2820019
Oh, no exif for some reason. Canon 6D, 17-40 f/4L USM, ISO100, f/16, 25sec. Aperture priority, edited in Lightroom.
>>2820019
Nice shot man. [:
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Also, some trails with the saturation bumped way up in the sky prior to stacking. Foreground is iffy, should have blended in a sharper Foreground from a single exposure but haven't bothered yet.
6D, Samyang14mm, 2.5hrs of 30 second exposures at f/2.8, ISO3200.
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>>2820029
Cheers. CC always appreciated if anyone has any.
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ive always felt that long exposure photography is very "high school photographer" teir
>>2820147
Thanks for letting us know that you're an idiot.
>>2819892
Shits a fking good ass pics,
Did you do post-processing? If you did what did you do on it?
>>2819892
Here's one of mine on a cellphone
My favorite!
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what do you think?
>>2820234
Could bump up the shadows and exposure a bit, the walkway and little hut thing are the most interesting parts of the frame but they're not really visible. Nice shot otherwise though.
>>2820225
Sorry, I've been at work. Haha. An dthat really means a lot man, thanks! And I did a little pp in Lightroom. I'm still pretty new to Lightroom and post processing as well.
>>2820216
Thanks for that. I didn't notice until you mentioned it. It's been dealt with it.
>>2820234
Way too many stuck pixels. Or at least that is kind of how I have had it explained to me. All the little red, green, blue dots. They tend to appear in too underexposed areas and they will be in the exact same spot every time. I've had to work pretty hard to fix it enough for me to consider usable or had to just not use the picture. If I am wrong about this, will someone please educate me on the subject as I hate having this problem. And is there something I can do on the camera side to fix this or make it a little easier to deal with?
I also tried a little long exposure for some unusual effects. What do you guys think of this? I wanted to go for a higher aperture/lower ISO/longer exposure but since I was shooting off hand this was the best I got.
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>>2820393
I like this. Where does the light come from?
>>2820403
Used a flashlight, had no other means at hand.
>>2820038
I just ordered the 14mm, should be here in the next couple days. Anyway cool shot anon, would have loved it if there was a more interesting foreground though.
Also whereabouts in Aus are you?
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>>2820394
how do?
>>2820531
that's cool beans. my efforts to do this are always mediocre
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>>2819983
You can take shorter exposures and stack them later too.
>>2820537
Well it looks like you have the trails figured out nicely, all that's left now is to find some interesting foregrounds.
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>>2820542
i also live in kind of a light pollution area so it's tricksy. did you composite that foreground or is that the whole honest shot??
>>2820534
Research camera obscura and go experiment
>>2820544
This photo was taken less than 5 minutes from the centre of town, so light pollution isn't an excuse m8.
>did you composite that foreground
Yeah the foreground is a separate 25sec exposure, the whole house and grass is illuminated by some factory lights around 600m behind me. The lights coming from the windows is from we waving a torch around inside.
>>2820545
so you poked a little hole in a windowshade or something? that's petty neato
>>2820616
That's about it. Used some plastic and tin foil to play with the hole size to get a sharper image.
>>2820657
whelp umma have to be doing this. thanks anon!
One of my first
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>>2820692
I already posted my favourite of this series in another thread
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I really like how this one came out.
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>>2820719
Not really LONG exposure.
The motiv is neat, but it has a lot of noise and the stars aren't even swirling.
>>2820721
...motif or motive. There is no "motiv"
>>2820721
It's a 30 second exposure. I would say that is decently long. Also, I don't have a remote yet so anything longer and I have to manually hold the shutter open the whole time. But I wasn't going for star trails, so I didn't need to the be swirling. The foreground is mainly the subject here, not the stars behind it.
I've been trying to design a rig to do this in my Kenworth.
If I did it the same way I did this one and rolled through a weigh station DOT would probably murder me in fines.
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>>2820733
I guess. The thing your photographed, the theme, Motif more likely.
Wrongly translated, sorry.
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>>2820890
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>>2820892
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>>2820894
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>>2820897
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>>2820899
Last one. who can tell me what this is?
Do you guys use dark frame subtraction ("long exposure NR")? can this be done in post to the RAW file?
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>>2820902
it can be done in poast but you need to look up exactly how to do it in your editing program of choice. from what i've read GIMP and Photoshop both have options. So what you do is take one dark frame and then you'll be able to shoot a bunch more without having to take all the time to do the dark frame for each shot, plus it's always nice to do your post in post and not in-camera.
>>2820721
>Not really LONG exposure
>30 second exposure
You're an idiot.
>and the stars aren't even swirling
>implying every astro shot HAS to have star trails
Again, you're a fucking idiot.
It's clear you're extremely new to photography, so here's some advice. Do yourself and everyone else here a favour by keeping your moronic "critique" to yourself, until you actually know what the hell you're talking about.
I'm very new to long exposure. Harsh critique welcomed
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>>2821083
Where was this at? I like it though.
>>2821115
downtown Orlando on top of some parking garage
>>2819993
In case you're wondering about what the constellations are.
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>>2820010
The issue with exposures longer than about 30 seconds is, you inevitably end up with star streaks. You really need to counter-rotate the Earth for longer exposures. Then of course if you have earthly objects in the frame, they get blurry from the camera moving. Either way, I'd recommend a cable release (E-bay, like $5-7). No worries about batteries in either the transmitter or receiver (which plugs into the D5200), and the switch slides when depressed to lock it for longer exposures. You will however, start to notice red light bleeding into the frames after some exposures of length. This is an artifact of the sensor heating up. When this happens, take a dark frame (leave the lens cap on and take a shot of the same length), and subtract that image from the sky images. It gets complicated.
>>2821129
Six hundred divided by effective focal length gives you maximum shutter speed before trails
>>2821145
600 / 200mm = 3 per mm. This is meaningless.
I suppose this is 3 seconds. Won't get many stars in 3 seconds, so what's the point?
3 minutes? You'll get trails way the heck earlier than that.
Experience: At full resolution you'll (easily) see stars are not dots at 20 sec. At typical screen resolution, you can get away with maybe 40. Obviously this means it's a question of degree.
So whoever came up with that formula needs to do a little more work on it.
>>2821333
the "600 rule" is an old rule of thumb from the film days for wide field astro. given an "average" film resolution, if your focal length is 20mm you could do a 30 second exposure without the stars making noticeable trails. if you use a longer focal length e.g. 40mm, the movement is more noticeable so you have to shorten the exposure (15 seconds).
with these newfangled high megapickle sensors the movement is more noticeable at a pixel level, so you'd have to reduce the 600 number (like 500 or 400).
for deep space astro this doesn't really apply cos you'd be stacking exposures or using some tracking mount shit.
>>2821333
Wow, it's been a minute since I've seen someone so clearly wrong while being massively sanctimonious.
Yes, with a 200mm, you're looking at around 3 seconds before you get trailing. On a crop body, it's around 2 seconds. If you're using a 20mm, then you get around 30 seconds on full frame and around 20 seconds on crop.
This is why there are things called equatorial mounts which allow you to take much longer exposures.
Your "experience" is entirely irrelevant here.
Oh, and the anon here >>2821740 is correct as well. Generally you'll want to use 500 instead of 600 (600 is usually ok at normal web display sizes, but once you get above that, you really want shorter).
Lose the attitude guy. You might actually learn something.
>>2820019
I like this
>>2821768
> Lose the attitude guy.
Umm.. Yeah...
>>2821740
Thanks!
>>2819980
>>2819995
The exposure is determined by the aperture and ISO, not the time.
This is because the stars will move across the frame and don't stay in the same spot to expose those pixels over the duration.
If you did another one at ISO 100 and f4 for double the amount of time you would have a similar exposure but trails twice as long.
Bonus: The longer you expose, the more noise you will get from the sensor, instead of make a 2 hour exposure you could make 12 lots of 10 minute exposures, stack them, and that will average out lots of noise.
Wannabe astophotofag here.
>>2821740
>>2821768
these guys have the right idea
>>2821333
has no idea
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>>2821969
oh and uh, ignore that EXIF, it's not accurate, sorry.
>>2821969
You took that? it's a beautiful shot alright. What is the real exposure info?
>>2821982
Wish I could actually say, sorry. This was from a couple years ago and I didn't keep a very good record of the process. It might actually be just one frame done at 10s with 3200ISO and I just cleaned it up with a darkframe subtract and a curve adjustment. I remember that I tried to do an image stack but it didn't quite work out for me.
Also it was through a 140mm f/5.5 Mak-Newt telescope on a tracking EQ mount.
The orion nebula is actually one of the largest and brightest objects in the northern-hemisphere sky, so it's been one of my go-to targets as I've been trying to learn, practice, and improve. It's even visible to the unaided eye if you know where to look.
Here's another one (two) of my favorite objects, M81 and M82, two galaxies that are visually right next to each other. Not a great shot though.
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Camera-Specific Properties: Equipment Make NIKON CORPORATION Camera Model NIKON D800 Camera Software Adobe Photoshop CS6 (Macintosh) Photographer Glen Cheriton Maximum Lens Aperture f/1.0 Sensing Method One-Chip Color Area Color Filter Array Pattern 986 Focal Length (35mm Equiv) 50 mm Image-Specific Properties: Image Width 4912 Image Height 7360 Number of Bits Per Component 16, 16, 16 Compression Scheme Uncompressed Pixel Composition RGB Image Orientation Top, Left-Hand Horizontal Resolution 72 dpi Vertical Resolution 72 dpi Image Data Arrangement Chunky Format Image Created 2016:04:21 22:01:47 Exposure Time 5 sec F-Number f/1.2 Exposure Program Manual ISO Speed Rating 1600 Lens Aperture f/1.2 Exposure Bias 0 EV Metering Mode Spot Light Source Unknown Flash No Flash, Compulsory Focal Length 50.00 mm Color Space Information sRGB Image Width 2000 Image Height 1500 Rendering Normal Exposure Mode Manual White Balance Auto Scene Capture Type Standard Gain Control High Gain Up Contrast Normal Saturation Normal Sharpness Normal Subject Distance Range Unknown
>>2820719
I like the tree detail and the color scheme and subject matter has a good holloween vibe to it.
It seems you needed 30 secs just to get a decently exposed shot with that lens though. Is that a kit lens?
I know this is a bizarre question but,
Does anyone here actually get nervous about going to the pitch darkness to do astro?
I'm not talking about /x/ shit, I'm talking about getting lost in some state park, getting hit by a car, getting eaten by a bear, getting shot by a vagrant, breaking my leg carrying my tripod, whatever.
I've never done astro before even though I want to. This is mostly because of the above fears, but also because I would have no idea where to start other than finding dark areas with little light pollution based on those online maps. Where do you even go when you find a dark part of your state, just drive around until you find a vantage point where you can see the sky?
Live in Pittsburgh, so there are some decent areas around here but I am assuming they'll be heavily wooded.
>>2822751
I'm more worried about idiots starting shit at night, even in secluded areas, which is why I carry my XD40 with HST rounds. Best part is I don't need a CCW because even though it is pitch black, it isn't concealed.
>>2822751
I've spent most of my adult life working at night so not really.
Parts of it were bartending, parts were bouncing, parts were as a soldier, and now working in heavy industry...it's the same as any other time of day, just pay attention to your surroundings and you'll be ok.
Amusingly, I've actually gotten a lot of business meeting random people while out doing things like long exposures downtown.
>>2821967
thats blowing my mind. So the overall brightness of the image stays the same with double the time? although it would "appear" brighter because the smearing of the stars whiteness would cover the sky pixels,
but I was also nervous about the moon, which was essentially full, and opposite to me. I didn't know how to calculate that because I didn't know if any haze would amplify or whatnot.
