Camera Definition and 306 Threads

Homework Statement Consider the following circuit in a camera flash where a light bulb is in series with a charged capacitor: a) Derive, but do not solve, the governing differential equation for the circuit. (Hint: treat the resistor and the light bulb as a single resistance.) b) Assume...

Homework Statement How we can determine The diameter of the lens of the camera approximitly that this picture took with that? ( we know that lens of the camera made by some parts but we count them as a thin one in Practical calculations ) Homework Equations m = q / p 1/f = 1/q + 1/p f =...

Hello guys, I was wondering if you could guess or even calculate the diameter of a camera lens with a picture of a ruler.

I've been trying to find a CCTV night-time camera for use to image deep-space astro objects as well as meteors. The only one I could find is the Water 902 H2 Ultimate. Is there another one that I could use that would be better ? My price range is $200 ~$400, although I could go up to $1000 if...

Well today my mother got a pretty nice camera, she's been wanting one for a while and what better way to test it then getting some shots of the moon! This is the best photo she could get, the rest were very shaky and we're probably going to invest in a tripod. I also went out with my cheapy...

I have two lenses for my microscope. The object lens which magnifies 63 X. Then there is my eyepiece lens with f=100 mm which focuses the incoming light at an camera. How can I calculate the total magnification? All calculations so far for the eyepiece involve the 25 cm of the human eye, but now...

Hi everyone, I was wondering if anyone knew what causes the popping sound when an external camera flash is fired? Kind regards Cody

Hi! a very basic question that probably has a simple answer: would it be possible to trace a laser moving over a generic surface such as a wooden floor with an IR camera? The idea would be to calculate relative movement based on that... If I'm not clear enough feel free to follow up with a...

Hello, I am working on a project where I am trying to take a photo of paper that I insert into a slot of an iPhone cover that I created with a 3D printer. My goal in this stage of design is to be able to take a photo that will disperse the light evenly across so that the lighting is uniform...

I'd like to share this tip, regarding focusing. Two of my three lenses are manual focus, so I've had to learn how to focus properly and quickly. When I first got my camera about 4 years ago, my lack of skill in focusing was obvious- at the time, I didn't appreciate how difficult it is to...

Hello. So, I am building a camera and have ran into a problem that I feel could be solved with a semi-simple function. There is a reel-to-reel system for winding the film from a spool to a dowel of 3/4 inch diameter. I need to know how many turns of this dowel would result in advancing the...

Homework Statement A camera lens has focal length 55mm and an object is 500mm away. Calculate the position of the image and the magnification (or reduction) Homework Equations 1/u + 1/v = 1/f u = Object Distance v = Image Distance f = focal length m = magnification The...

Hi, my problem is this; I am designing a cable camera system to film downhill pursuits. I need to calculate how much tension is required to hang a cable over a 100m span with no more that 0.5m sag in the middle, when is it fixed at two point, both at the same hight. From the research I have done...

I wish to synchronize a thermal camera FLIR A300/600 with a test section on a rotating shaft such that whenever the section becomes orthogonal to the line of sight of the camera, an image is clicked by it automatically. The camera uses a TTL pulse input. Being a mechanical engineer, I have...

http://m.ebay.com/itm/271230081889?cmd=VIDESC&gxo=true How can I set this module up to have just a single video output so it can work with rca?

im a student working trying to start a project creating a motion sensor and camera outside my door way, was wondering if anyone had any ideas of how i should get started. i don't want to buy the sensor because i want to learn how to produce the product from scratch, any help would be great

Hello, I'm new to this forum, and I hope you can help me. I'm working on a project to build my own motorized camera slider. Before I buy all the components, I want to be sure about my calculations. Mechanical engineering was never my forte, that's why I'm looking for help on this forum...

Hello all, I've been trying to come up with an optical design to basically form images onto a sheet positioned near the ground, in an old camera-obscura fashion. Hopefully this image helps to visualize. http://www.pinholeblender.com/COimages/mirror.gif I know that I will require a 45...

If a spacecraft moving near the speed of light has a camera set up inside observing the people in the spacecraft , and the camera is connected to a computer on Earth so that observers on Earth could watch the video that the camera sends, what would the people on Earth see? Would they see...

Hello, I have a little wireless camera that I want to power on a battery. The camera requires 12V ~1 amp DC to run. I am a DIY kind of person and have a few lead acid batteries from work, all of them are 12V DC, but they range from 4.5 amp to 12 amp. I've worked with AC power in the past...

I have a Sony Cybershot Dsc-w1, and it's been acting funny lately. I charged the batteries all the way up and turned it on and it kept shutting back off immediately. There's a dial on top of the camera that changes what you want to do. There's a settings option, film option, still picture...

I just recorded a girl giving a monologue and every time she moves her arms or her body, she becomes wavy until she stops moving. This is a Canon Vixia HF100, so it's a decent camera. Maybe the room was too dark? Maybe the background was causing a problem? Anyone know what could be causing this...

Modern cell phones seems to come with IR filters on their cameras. I want to do an experiment to figure out what wavelengths these filters allow to pass and which they block. How would I go about doing this? Also, what sort of equipment would I need? I am a university student so I have access...

Hey guys, I am making a full face helmet which uses a small hd camera to display a live feed on a 5" hd screen inside. My question is simply, how would i connect the camera to the screen? It only has to display a live feed while the battery is on and not record/store on a HDD. Thanks...

Hello, I am confused for a laue camera how the angle of reflection off of the sample is 180 -2θ, where θ is the scattering angle. How is the reflection off the sample not just θ?

I take high speed videos of tennis strokes for analysis. One of the best and most informative camera vantage points for observing the tennis serve is from above the server. Here is an example of one of the rare high speed videos available taken with the camera above the server...

I'm confused about this. I'm looking at two point and shoot cameras. One is 10MP and has a sensor of 1/1.7. The other is 12MP and has a sensor of 1/2.3. According to this wiki article: http://en.wikipedia.org/wiki/Image_sensor_format, the 1/1.7 sensor is physically larger than the...

I have an android tablet running ice cream sand witch 4.0 I need a basic camera app that when I take a photo it will let me save it in my pictures folder on the tablet. I am on the play store and need a free app.

Dear PF, I am hoping you can help. I am trying to test the the speed that a beetle heats up under standardized conditions. I have buried a small container in crushed ice and place a beetle and thermometer inside. I wait until the thermometer and has reached 0°C, the idea then is to increase...

So I have come across a specification of a narrow field of view camera. The specification states IFOV=30 microrad FOV=2x2 resolution=<.1m at 1 km If I assume a 1K sensor at 9micron pitch and an aperture = 3.7cm I have resolution at .013 m Chip size = 9.2mm Focal length is...

So in my lab, I am working with fluorescent bacteria, specifically GFPa1 (green fluorescent protein a1) which are excited with around 500nm light and emit around 516 nm. Forgive me if these aren't correct, it isn't essential for this write-up and my notes aren't in front of me. Is there any way...

So I have four pinhole type cameras in my experimental setup. All of them have the same magnification and are placed at the same distance away at different locations except one which has a different magnification and zoom. This camera is 72.5% further and has 52.5% less magnification as the rest...

Hello everyone, I'm a photographer and am developing a project in which I'm needing some help. I went to some engineers friends first but they told me Physicians would be the ones who would have the answers I need. I'd like to know how can I interfere in the way my camera's sensor...

Basically I have to make a comparison matrix of the bionic eye, the human eye and the camera. I want to sound scientific so I thought I would check what you guys think I should use as properties in the matrix?? Please thankyou :)

Hi, I was wondering, what would be the smartest solution for recording lectures at university with the following requirements 1. I want the video files to be a small in size as possible (not filling my harddrive to fast) 2. The quality to be good enough so you can see the text on the...

http://vimeo.com/11789304# i mean seems evident a dome is intended as a camera obscura even oculus in latin means eye but how is it posible that knowledge isn't any more? what sense does it make to put a flat lens in the oculus so there's no effect any more? why they don't put the right...

Camera help -- Win7 HomePremiume and picture uploads I have the Canon SD 1000 Camara and Win7 Home Premiume on my Desktop. When I plug the Camara in a windo opens asking me what do I want to do and I click Import Pictures and it works. On my Laptop I am running Win7 HomePremiume the same...

Ok, I just got a camera and I haven't used one in like 20 years. I got a fujifilm flash. It was 5$. And I think it's a disposable camera. On the top of the box it says 27 Exp./Poses. Does that mean that's how many pictures I can take with this thing? That's the only number I see on the...

Hello, I have a simple(or not?) math problem: I have equations of 3 lines in R3 trought the origin: line l1: |λ1*x+β1*y+γ1*z=0 |λ2*x+β2*y+γ2*z=0 line l2: |λ3*x+β2*y+γ3*z=0 |λ4*x+β3*y+γ4*z=0 line l3: |λ5*x+β4*y+γ5*z=0 |λ6*x+β5*y+γ6*z=0 I know every λ, β and γ -...

Hello Forum, when a camera is focused at "infinity", everything from infinity on is in focus (acceptable). How is that possible? Every plane that is not in perfect focus has a certain circle of confusion that gets larger (more blurring) as we move away from the best focus plane... Also...

Hey I was wondering, is a CDD camera(e.g. FreLon detector) the same as an ordinary semiconductor detector (e.g. Pilatus detector). I have searched a little on the CDD camera, and for me it seems like the same thing. Wave Energy -> electron hole pairs -> signal. Or have it something to do...

So here's the situation, say i record, presuming the camera is perfectly vertical, an object falling next to a ruler. I then find how many pixels that ruler is and from there i can translate how many pixels the object has moved into how far the object has moved. The question is how reliable is...

This is nothing short of amazing. MIT figured out a way back in February to view how light 'moves' on, about and through objects. Here is a link: http://www.youtube.com/watch?v=snSIRJ2brEk&feature=related They apparently use multiple staggered high speed cameras to capture the images and...

killed by camera flash??! i've read a story from somewhere. a guy was trying to take photos using his camera. unfortunately he was standing near a high-voltage substation. once the camera flashed, he was killed immediately. they said that the electric current flows trough the camera flash to...

Infrared works perfectly fine as a watermark on still images (infrared LEDs put at the back of the image) and even videos when the surrounding is dark. Is there a way to make it more noticeable even in broad daylight? And let's say, if my surrounding is dimmer and I want to obscure...

I am working on an android application that will need to take and store pictures. I'm familiar with java but not with the Android APIs. I tried to start by just including the functions for taking and saving an image using the information on the android developers page(Camera | Android...

These two websites: http://www.increa.com/reverse/dc/ and http://thesignalpath.com/blogs/2011/06/12/camera-flash-circuit-and-nixie-tube-tutorial/ have very similar circuits for a standard camera flash circuit...and overall do a decent job explaining them. There is one question I...

I have win7. premiume 64 Bit and a Canan SD1,000 camara. The first time I pluged my Camara in win7. gave me a window on the system tray asking me how I want to import the photos. So I set it up to Automaticly import all photos to a Folder on the Desktop. So now whenever I plug the...

I'm looking for a new camera. I don't need anything too fancy, but I'd like to be able to record 1080p video, take decent photos, and preferably the ability to mount it on a vehicle dashboard and/or motorbike handlebars to take videos while driving. Price is not too big an issue, as long as...

Hello all, I'm currently using an infrared camera to determine the emissivity of a steel. The camera "sees" whatever radiation entering the objective, and calculates the temperature of the steel by assuming it's emissivity is 1. I figured I could use an energy balance to find the emissivity...