Lens Sensor
Lens Sensor
Pentax k200d; Are there any ways of cleaning the sensor other than the dust shake and gentle air blow as?
described in the manual? I have small grey smear marks on all my pics – same position on all and regardless of which lens I have attatched. I have not touched the sensor with anything.
Hi Spartan L,
No matter how good of a sensor dust removal system a DSLR has, eventually you’re going to have to do a wet cleaning, because some dust is sticky.
I’ve been using the Copper Hill SensorSwipe for several years; at the time it seemed to be the only such product on the market, and it works fine so I have no incentive to investigate the similar products that have appeared since then:
http://www.copperhillimages.com/index.php?pr=Copper_Hill_Products
I was a little nervous the first time, but I’ve never damaged the sensor after many wet cleanings. Just remember to swipe gently, don’t touch the sensor with anything else, and follow the directions.
But wet cleanings are a bit of a chore, and in the last couple years I’ve been using the VisibleDust Arctic Butterfly for more frequent, though dry, cleanings:
http://www.visibledust.com/
It works quite well, though you’ll still occasionally need to do a wet cleaning.
Some people argue that the theory behind the arctic butterfly is impossible. Though those discussions can certainly be interesting, the bottom line for me is that it works very well. Being absolutely certain of exactly WHY it works is not critical for me. If the real, true reason it works is actually something different than the reaon the company believes it works, that’s okay with me.
Both wet cleanings and the arctic butterfly are vastly more effective than air blowers. I don’t waste time with blowers anymore.
One last thing — my DSLR, a Pentax *ist D, doesn’t have anti-shake, while your K200D does. So be sure to ask Copper Hill and VisibleDust whether those products are okay on Pentax anti-shake cameras.
Good luck!
Greg
Lens Sensor
Temperature Sensors; A Brief Introduction
From the humble thermometer to advanced electrical heat recorders, temperature sensors are used for all manner of purposes in a disparate number of industries. The more advanced forms of contact measurement device are labelled as thermocouples and resistance temperature detectors or RTDs. The measurement of temperature typically takes place in liquids or through contact with the target surface. Contact measurement is not always required however; there are sensors on the market that are able to make a measurement of heat without physical contact. Normally this is done with the use of either infra-red or air ionisation technology.
When selecting a sensor the large amount of considerations can make the decision making process difficult. Part of this process should be an assessment of the temperature range that must be measured, how accurate the device must be and how long it will take for any particular device to produce results. For those who consider accuracy to be of prime importance the most common choice is an RTD sensor. Cost may also come into the equation, if this is the case; thermocouples present a far more affordable and cost effective option. It is hoped that this following information will give those considering temperature sensors the knowledge required to decide between RTD, thermocouple and Infrared thermometer varieties.
The RTD uses the increased resistivity caused by heat to make an accurate measurement of temperature. The manufacture of RTDs uses materials such as platinum, nickel and copper for their chemical properties. Copper and nickel variants are most widely used in situations where low temperatures are measured; in contrast platinum, a far more expensive material has a greater range and hence are used for more far reaching applications. Despite their advanced uses the basics of RTD construction are relatively simple; normally the sensing element made from metal is connected to a non-conducting component made from either ceramic or glass. Resistance is measured across the two elements and from this the temperature can be deduced.
Thermocouples are fundamentally different to RTDs as they use two different metals, connected at one end that produces a voltage; this voltage is then converted into a heat reading. The meeting point of the two metals is termed the sensing junction; this component can be attached to wire extensions, subsequently increasing the physical range of the device. As almost any metals can be used in the manufacture of thermocouples, the construction costs are markedly less than those of RTDs. A downside is however that any interference in the circuit will lead to inaccurate results; in some applications this is simply not workable.
Infrared temperature sensors are becoming increasingly popular in many industries and scientific situations. They do not require contact with the target material in order to gain a reading. This remote measurement is particularly useful for some applications, such as in motor sport where the heat of tyres needs to be measured. The device focuses infrared rays through a lens and then measures the effects on the light to gain a reading. Other applications for this form of device are in the calibration of built-in thermostats, in fridges and ovens.
This article has been only an introduction into the different forms of temperature sensor on the market today. It is brief and literally scratches the surface of the types of sensors out there and how they work. The ultimate objective has been to give those without previous knowledge a good starting point for further research into the world of temperature measurement.
About the Author
Science and technology expert Thomas Pretty looks at the different temperature sensors on the market and the applications they are used for.
Good portrait lens for APS-size sensor camera? Best answer 10 points!?
Hi I have a Nikon D40 (ie not a full frame sensor, the factor is about 1.5, I think).
I would like to do some indoor portrait shots, and I want to pick a lens which is fast enough, and whose focal length is long enough to blur out distracting backgrounds (pictures on walls etc). I don’t mind if the lens is not an AFS mount, although obviously that is a preference.
If I get the 50mm f/1.8, will it blur the background the way I want?
What about the 85mm f/1.8?
And the 105mm f/1.8? (Also, is this lens too tele to be able to use indoors?)
Finally, if I get the 28-75 f/2.8, will this give me the flexibility to blur out the background at the long end, while keeping it in focus at the wide end, ie will it give me the flexibility to switch between the two?
Thanks a lot, I still only have the kit lens, so any advice much appreciated.
Yeah, you’ll probably make out okay using your kit lens at 55mm, wide open. That’s f/5.6, though, so you’ll want to have the background kind of distant from the subject.
For better control, the 50mm f/1.8 or f/1.4 is a great choice, especially now that there is an f/1.4 AF-S lens. Not cheap. The f/1.8 lens is a real bargain.
Anything longer than that will be a handicap indoors.
The 28-75 should work nicely.
Handycam CX520 with Exmor R™ Sensor & G Series Lens for amazing low light video and stills
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