How I can know if my apartment walls are concrete or drywall?
I can drill with a standard screw very easily after a bit of hammering to get them started. I'm assuming because they do not need a masonry bit they should be cast, but I want to be sure.
If you go to a screw that is not understood then it is definitely concrete drywall. Concrete walls simply strip the screws or burn up if not classified for concrete. Plasterboard is also a white powder that comes from the holes, while the concrete dust is light gray. Most apartments are be cast as well, because it is cheap and easy to replace when someone puts a whole in it.
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Digital cameras are based on a sensor that reacts to the light reflecting off the subject of the photo you are taking. A certain amount of light is required in order to get a good shot, and that optimum amount of light is basically the same in any situation.
The three things we have to play with to adjust the amount of light are shutter speed, aperture and ISO.
Shutter speed and aperture are closely related. If you increase the aperture (lower F-Stop number) more light gets to the sensor, so the shutter speed has to be increased to adjust the amount of light. Conversely, if you choose a small aperture (bit F-Stop number) then the shutter will have to stay open longer to let in more light. Think of filling a bathtub. If you open the tap all the way (aperture), the tub will fill in less time, and you will turn the water off sooner (shutter speed).
In order to get a good exposure, you need the right combination os aperture and shutter speed. Most cameras have settings where you can adjust one and the camera will automatically adjust the other to compensate and give you a great shot every time. If you have a more professional camera, you may be able to override this feature and choose both manually, and alas, some point and shoot models give you almost no freedom. I have one model that has no aperture settings at all.
In terms of exposure, a narrow aperture/slow shutter speed will give you the same result as a wide aperture/fast shutter speed combination, but varying the aperture also affects the depth of field (DoF) or how much of your subjects background will be in focus. If you are trying to achive a blurry background like in our cherry blossom shot above, you will want a narrow depth of field which can be achieved by choosing a wide aperture setting (low F-stop number), or if you can’t control that, and fast shutter speed, which will force the camera to change the settings to increase aperture.
ISO used to indicate the sensitivity of the film you were using. A high ISO film was more sensitive, and needed less light. Now that most of us are using digital cameras, the ISO setting is actually just a simulation. Increasing the ISO number will cause the camera to have a higher shutter speed which may result in a small depth of field, but use it in moderation, as you may see more digital noise with a highter ISO (that awful ‘grainy’ effect)
Once again, if you want to achive that ellusive blurry background:
Use the widest aperture (lowest F-stop) if you can control it. If not try a high shutter speed or high ISO setting
Have the subject as far away from the background as possible.
Try to get the subject as close as you can. If possible use the macro setting on your camera and take the subject just inches from the lens.
Thanks to Elizabeth Laurel for the great shot of last spring’s cherry blossoms!
Posted 3 years, 4 months ago at 10:40 pm. 2 comments
I introduct something about monitoring CCD camera traffic. Suitable for Bank Supervisory Model Image Sensor1 NOVS-31 / 3 "SONY Super HAD CCD Pixels762 (H) x 582 (V) minimum Illumination0.08Lux/f0.8 horizontal. Resolution535TVL Sync. SystemInternal Sync. S / N? 52dB Electronic shutter ShutterAuto.1/50-1/10000/8 way manual adjustable balanceATW White / MWB backlight CompensationDigital ON / OFF Lens GAMMA0.45 controlAUTO gain DriverDC / Video power supplyDC12V/AC24V (± 20%) Efficiency200mA/3W Video output1.0V power (PP) / 75? Dimension126 output × 70 × 70 (mm) operating storage temp10 temp30 to60 to50 weight500g CCD camera monitoring traffic Canon EOS 40D Type Digital single-lens reflex Sensor 22.2 x 14.8 mm CMOS Maximum resolution 3888 2592 (10.1 megapixels) Lens Type EF Interchangeable (EF-S) Shutter focal plane Shutter speed range 30 s to 1 / 8000 s, bulb Exposure Metering TTL full aperture, zones Exposure modes Full auto, programmed, shutter-priority, aperture priority, manual Measurement modes 35 the assessment area, partial, spot, C / WGT Average Focus Areas 9 user points (cross type) Focus modes One-Shot, AI Servo, AI-Focus, Manual Continuous shooting 3 or 6.5 frames / second Viewfinder Optical / LiveView LCD ASA / ISO range 100-1600 in 1 / 3 EV, 3200 Available Expansion Flash pop-up, sync at 1 / 250 seconds Flash Bracketing none Focus bracketing none Custom WB 7 presets, Auto and custom 200 010 000 Kelvin, K 100 steps WB bracketing 3 images, + / -9 levels Rear LCD monitor 3.0 in (76 mm), 230,000 pixels Storage CompactFlash (CF) (Type I or Type II) and Microdrive (max 32GB) Battery Rechargeable Li-Ion BP-511A Dimensions 145.5 x 107.8 x 73.5 mm Weight 740 g (body only) battery packs optional BP-511A, BP-514 BP-511, BP-E2N grip-512.BG allows the use of AA batteries. The Canon EOS 40D camera is a semi-professional 10.1 megapixel digital SLR Single Lens. It was initially announced on 20 August 2007 and was released later that month. It is the successor of the Canon EOS 30D, and is succeeded by the EOS 50D. It can accept EF and EF-S. Like its predecessor, uses a sensor APS-C sized image, resulting in a 1.6x field of view factor for crops. Improvements The main changes of the 30D include a higher resolution sensor (10.1 megapixels instead of 8.2). The sensor also has better noise control than previous models. The 40D has a larger memory buffer to be written more photos to a faster pace. Frames per second has increased from 5 to 6.5. The 40D adds a new format, sRAW Canon RAW image is smaller for small prints and small size file. 40D RAW format is 14-bit instead of 12-bit 30D .. The camera uses the new DiG! C III image processor, which was first used in the Canon EOS-1D Mark III, introduced earlier this year. Canon DiG! C III processor delivers performance, improved color performance and time to start almost instantly. A new sensor cleaning system has been introduced. You can also use the Canon Wireless File Transmitter WFT-E3/E3A. The 40D has a bigger screen ("March of the same resolution) than the 30D (2.5"), and 20D (1.8 "). There is a new menu for external and internal flash control, including second curtain sync. Other additions to the 40D Canon include interchangeable focusing screens, a much-needed AF-ON button, the EOS Integrated Cleaning System to reduce dust from the sensor, and three new accessories Optional: one is the version of the kit lens 18-55mm, a new compatible with previous versions, the live view mode, and a sealed battery grip with climate. Overview and features
EOS 40D EF-S 17-85mm F/4-5.6 IS USM The 40D has many features similar to their predecessors the 20D and 30D. This includes various shooting modes, ability to change ISO and white balance, a unit of pop-up flash and an LCD screen. The LCD screen is larger than previous models (3.0 "2.5" previously). The 40D has more megapixels, and order sizes are slightly higher than the 20D and 30D. Its format RAW is 14-bit. A new feature is Live View, which allows photographers to use the LCD as a viewfinder. The shutter noise is quieter this way. 10.1-megapixel CMOS APS-C sensor DiG! C III processor 3.0 inch LCD Monitor 14-bit processor Live View Mode Large 9 point AF with center cross-type sensors Selecting the AF and metering modes Built in Flash EOS Integrated Cleaning System ISO 100-1600 (3200 with the custom function) Continuous Drive to 6.5frame / s (75 images (JPEG), 17 images (RAW)) Canon EF / EF-S Lenses Canon Speedlite EX PAL / NTSC video output File formats are: JPEG, RAW, sRAW (both RAW formats are 14-bit) RAW and JPEG simultaneously recording USB 2.0 computer interface Types BP-512/BP-514 BP-511/BP-511A or batteries (BP-511A battery supplied) Approx Weight 0.740kg Firmware and Software Canon launched its DPP 3.1 RAW converter with the 40D. Initially, Adobe Lightroom had no official support for the 40D but RAW and JPEG … (And so on) For more information, please visit some products on mini dv camcorder, camera Scientific CCD. Traffic surveillance CCD camera products should show more here!
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Posted 4 years, 11 months ago at 9:02 am. Add a comment
How do I make a virtual drive in Linux so you can mount an ISO file, so you do not have to burn to a CD?
I am running some thin clients and I have a Vista CD. ISO file. for some reason when I burn the ISO to a CD that tells me everything is complete and that there were no errors, but when I try to put it on another computer (different), Linux or Windows tells me that no files on the CD. So the only way I can install the operating system Vista use alcohol 120 and mount the ISO file to a virtual drive (in Windows). So just need to know if a program like alcohol 120 for Linux and if there is, whether it able to assemble one. ISO file.
u can use craxtion 4 wins his work on is where u can get http://craxtion.xbox-scene.com/download.html
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How to tighten the screws for wood in the softwood under heavy door?
We have a heavy door with hinges mounted to a frame 3 of softwood. The door was locked improperly opened with the result that the screws were removed from the structure of softwood. The screws will not "bite" into the wood and can not be more stringent. They are anchors as "Molly" the only solution for this? Or, these holes can be filled with a material timber to allow the wood screws to be used again?
old carpenter's trick is to use golf tees [are from a] wood very dense hard. insert them into the screw holes, which arise for them to not stand out and reinstall the screws. if this doesn't work and use screws extend whihch beyond the door frame 2×4. good luck
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Digital cameras are based on a sensor that reacts to the light reflecting off the subject of the photo you are taking. A certain amount of light is required in order to get a good shot, and that optimum amount of light is basically the same in any situation.
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