44
votes
Accepted
What are the reasons for not taking super long exposures (hours) in astrophotography?
@Michael Clark and @Itai have provided good answers. A few more thoughts from the perspective of the enthusiastic amateur:
Tracking technology isn't perfect and sometimes its better to work within ...
- 536
34
votes
Accepted
Why in a photo light lines of street lamps? How to remove them?
It looks like there are parallel light trails below each streelamp -- going down, then right, then down some more (ASCII art):
/
|
|
|
\_
\
|
And ...
- 3,912
32
votes
Accepted
Why is it that when the green channel clips, it turns into blue?
The light you describe as "green" also contains components of "red" and "blue" light. They are much weaker than the green component, but they are there.
Once the exposure is bright enough for the ...
- 176k
19
votes
What are the reasons for not taking super long exposures (hours) in astrophotography?
It is firstly because we can now.
Bulb photography can indeed shoot exposures of minutes to several hours, depending on the camera. Using a film camera, astrophotography is done with very long ...
- 103k
19
votes
What are the reasons for not taking super long exposures (hours) in astrophotography?
The main advantage of stacking is to average out the randomized Poisson distribution "shot noise" that can be a problem in low light images such as astrophotography. Another advantage for stacking ...
- 176k
18
votes
How can I take good photos of stars out of a cockpit window using the Samsung 21 ultra?
You just need to block the reflections from the lens' FOV...
Probably the best answer for use in a cockpit is a rubber lens hood.
- 18.8k
16
votes
What settings for Dirt track night time pictures
I see two main problems:
Too slow shutter speed.
Overexposure.
The first goes directly to the issue you ask about. You are stuck with whatever lighting there is, so you can only trade off ISO, ...
- 17.4k
12
votes
Accepted
What are the features needed in a DSLR for astrophotography?
I already have a Nikon D5200 and I I tried so much to get a clear view of the sky and it didn't work so much.
The camera you have is a fine one to start with. You should spend some time working on ...
- 31.7k
11
votes
Are there add-on lens accessories which collect additional light, as a parabolic microphone can be used to gather more sound?
There's already something that has been invented to collect light for photographs. We call them lenses. In order to collect more light, the front element of the lens must be larger for the same focal ...
- 176k
10
votes
What are these disks in my photo taken with the Tamron 10-24 lens?
They're internal reflections of a bright light source inside the lens; from their position and the lighting on the trees, I'm going to guess there was some street lighting somewhere just out of the ...
- 22.1k
9
votes
Why in a photo light lines of street lamps? How to remove them?
How annoying :-) - I finished marking up a photo and now see that Chris H has done much the same but better. So I'll post this 'for completeness' but with less comment than I otherwise would have.
I ...
- 19.7k
9
votes
Accepted
switched to RAW and seeing ugly light bands in Lightroom
The first thing you must realize is that what you are seeing on your monitor is not "the" raw file. What you are seeing is an 8-bit demosaiced preview conversion of the raw file created by ...
- 176k
9
votes
What are the reasons for not taking super long exposures (hours) in astrophotography?
Digital sensors heat up over long exposures; I've had exposures as short as 6 minutes exhibiting very visible colour distortion in the corners of the frame. Run the chip continually for hours without ...
- 622
7
votes
Why in a photo light lines of street lamps? How to remove them?
Although the poster hasn't specified it, this answer assumes this picture was shot on a tripod (it looks too sharp to be hand-held, even holding the camera steady against the window).
Many claimed ...
- 180
7
votes
Accepted
How do the stars in this photo appear without star trails even at a long shutter speed?
A little late to the party here, but as the photographer in question I thought I'd weigh in. It's a single exposure. I used an external speedlite flash to "paint" the tree - with several ...
- 86
7
votes
Accepted
Does shooting at high ISO have a practical impact on battery life compared to exposure time?
SImple answer: not to a measurable extent.
Difficult answer: A high ISO-equivalent setting cranks the analog gain up. More gain requires more power per electron (or milliVolt if you prefer), but ...
- 1,887
7
votes
Accepted
How would one get a moon shot like this?
The "shadow" area of the Moon is lit by Earthshine - light reflected towards the moon from the sunlit part of the Earth. From the Moon's point of view, the more of the earth that's sunlit, the ...
- 3,033
7
votes
Why is it that when the green channel clips, it turns into blue?
Why is it that when the green channel clips, it turns into blue?
Actually, it turns towards magenta. Look more closely at your picture.
When green clips and the other two channels (red, blue) don't,...
- 17.4k
7
votes
Accepted
Are there add-on lens accessories which collect additional light, as a parabolic microphone can be used to gather more sound?
As you edited your question it gives me more room. The same as a parabolic mic, any mirror lens do the exact same thing. It takes parallel rays coming from a distance, and focus them on a smaller spot....
- 25.2k
7
votes
Accepted
Looking for advice for choosing a DSLR for landscape/night photography
Would it be better for me to jump ship to Nikon and start from there or should I continue with Canon and use the few lenses I already own?
You're putting the cart a bit before the horse.
It would be ...
- 176k
6
votes
Why in a photo light lines of street lamps? How to remove them?
If you consider the light trails of the headlights of a vehicle, in the foreground, that appear to pass through some parked cars - it seems likely that the camera was tilted vertically during the 32 ...
- 1,252
6
votes
Circular Pattern in Night Sky Image
That very much looks like a reflection of the lens on the protective glass to me... along with another reflection from something outside. It does not look like banding due to editing.
This is the kind ...
- 18.8k
6
votes
How can I use a Ricoh 35 FM film rangefinder to take photographs at night?
You are shooting with a film camera. The ISO dial only tells the camera the speed of the film you have loaded so the camera meter can set the aperture. You will need to use a fast ISO 400 film but ...
- 6,774
5
votes
Does shooting at high ISO have a practical impact on battery life compared to exposure time?
If you have noise reduction completely turned off then the effect of using a high ISO setting on battery life should be minimal.
Most of the increased power demand of using high ISO settings is due ...
- 176k
5
votes
What are the features needed in a DSLR for astrophotography?
In addition to what Caleb suggested, you can improve your images in a number of ways. You didn't specify what type of astrophotography you're doing. There's landscape astrophotography, where you're ...
- 2,893
5
votes
I want to take photo of moon with my mobile camera?
Unless you have a multi-camera phone with a very strong telephoto option, the moon is much too small in the frame to give usable results even with modern, high resolution sensors.
A single camera ...
- 7,232
5
votes
Astrophotography - Image quality reduced after multiple long exposures
Without sample images and specific exposure information it's difficult to do anything but guess at what may be causing your issue.
Long exposures aren't normally a problem. Astrophotography images ...
- 3,967
5
votes
How to create a fake long exposure from a bunch of frames
You can also use the frame averaging technique. This takes a set of images and calculates the average (or median) value for each pixel. This technique can be used to reduce noise, remove moving people ...
- 8,723
4
votes
Can I fire an off camera flash remotely that ISN'T linked to the camera?
Of course it's possible. You have at least 3 solutions:
An infrared transmitter: the camera and flash must be in sight, no obstacle between the two. Operation is bad in daylight.
A radio transmitter. ...
- 151
4
votes
Accepted
What matters for low light performance?
If you are genuinely serious about doing night photography you would be much better off with a full frame camera. A used 5D Mark II (or maybe even a well used 6D if you're willing to wait on a good ...
- 176k
Only top scored, non community-wiki answers of a minimum length are eligible