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Bright spot in center of lens, out of focus - Sanyo PLC XP18N Multimedia Projector

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Diffuser (fly-eye) lens fried or broken and needs to be replaced.

Posted on Nov 09, 2009

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Posted on Jan 02, 2017

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How to Spotting Scopes Work?


Spotting Scope is a type of telescope typically used for observing wild animals and birds. A spotting scope features more magnification than a conventional binocular but less than an astronomical telescope.
The utility of a spotting scope becomes most obvious when the identification of an animal going in a large herd is required. Figuring out a specific animal from other look-alike animals becomes easy with such a device. For digiscoping purposes, few things can beat the power of spotting scopes. It is possible by using binoculars or telescopes to take a closer look at birds or other animals, but if you want a precise view of your target animal, a spotting scope is preferable.
Spotting Scope Features Explained
  • Objective lens
    Objective lens, also known as the Front lens, determines the image quality at higher magnifications. The diameter of this lens ranges from 50-100mm in size. It is also called "Aperture" of the lens. It is wise to buy the highest size of the objective lens considering its weight. Larger lenses allow to pass more light and create more bright images. This means you will get higher image quality with the larger lenses.
  • Lens Coating
    Manufactures often apply the chemical coating, which is known as Lens Coating, on the lens to reduce noise and increase light transmission. They also offer "fully coated," "multi-coated" and "fully multi-coated" lens to improve image quality. The premium quality spotting scopes' lenses are multi-coated with multiple layers on the surface.
  • Focusing
    There are two types of focusing mechanism in the spotting scopes such as Helical and Knob focusers. The focusing characteristics determine how quickly you can focus on the object with maximum precision. Between these two options, the helical focuser is the finest option for birding as it can change magnification rapidly along with the movement of the bird. For hunting or spotting slower animals, Knob focuser is best as it gives you more precise information than the former one.
  • Eye relief
    The eyepiece remains at a little distance from the users' eyes. This distance is called the eye relief where the light rays transmitted from the object pass to enter into your pupil. The comfortable eye relief distance is about 15mm to see the full field view. This feature is very important for those who wear eyeglasses. Nowadays, manufacturers are offering long eye relief for those who need to wear eyeglasses for convenient viewing.
  • Image Quality
    You might have seen some designation on the glass label of the spotting scope such ED glass, APO glass, HD glass, Fluorite glass. These special qualities of glass will cost you more but create a huge difference in image quality comparing low-quality lenses. Remember, you must pay for the good quality images when it comes to buying any types of optical instruments.
  • Magnification
    The magnification of spotting scope is higher than standard binoculars and varies between 15x to 75x. The power of the eyepiece determines the magnification of the scope. The important fact you should know that image quality drops off as the magnification goes up. Even premium quality scopes also lose a little quality at the highest magnification.
The condition of the atmosphere has effects on birding, hunting and digiscoping too. Humidity, ever-moving air, dry climates, dust and so on hinders the magnification and image quality at large.

Apr 08, 2018 | Optics

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I have little spots all over the screen display, i believe to be caused by dust in the lens assembly. could that be the problem? i see a lot of dust behind the glass... how do i clean it?


Hi,

If there is dirt or other deposits on the LCD panels they are usually most visible at the extremes of focus. They will be blobby. You may also be seeing dead pixels which are clearly visible when in focus.The lens assembly itself will be sealed and is unlikely to be the problem, don't worry about flecks of dust in the lens area. You can clean the external lens with a soft cloth, much like a camera lens.

Projector internal optics are non-user servicable. If you can't live with the spots it will need to go to an approved center for cleaning / or repair. You should be able to find out where via this page

Feb 14, 2011 | Sharp XG-E3500 Multimedia Projector

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When I look through the viewfinder, it shows up as a circle instead of a rectangle showing the whole view, no matter what lens i put on it, but when the lens is off, it shows up as a full rectangle, whats...


What you are seeing is the focus spot or indicator and it's etched into the mirror so yes you will see this prominently without a lens and considerably sharper with a lens. The square box would be for the light meter and the round circle is your focus point. Nothing is wrong, in fact you can change the focus point on the camera. There is actually 45 focus points 7 which are in the center you need to be able to see these to know where to aim/point the center of the camera.

Dec 17, 2010 | Canon EOS-3 35mm SLR Camera

2 Answers

Im using sanyo pdg-dsu21b model. right now, my projector has this little white bright spot all over the projection. can anyone please tell me whats the problem with my projector and what is the solution...


Unplug you projector and allow the bulb to cool. Open the area where the projector bulb is located. Check the projector lens for any damage and clean it from dirt's and dust. Same as with the bulb.

Nov 09, 2010 | Sanyo PDGDSU21E DLP Projector

2 Answers

Spot on front element of Kiron 80-200mm f/4.5 zoom.


Kiron lenses had some unusual designs- doesn't have a thread ring holding the lens element in does it? As I remeber you had to almost completely disassemble the lens to get at that front element. FYI, the closer the spot is to the "optical center" of the lens, the less likely it is to have much effect on picture quality, EXCEPT if you shoot lots of bright objects, so you might just live with it

Feb 13, 2010 | Cameras

1 Answer

Same exact thing......My mom thinks it needs a new battery.


Hi!
It sounds like your camera lens focus is stuck - could be sand or something in the focus gears - that's the weak spot of these lens. If you can't open the lens and check your lens focus gears yourself, you should contact your local Olympus service center or other camera service center. You can contact me too at toms.safranovs@gmail.com and I can give you a good price.

Hope this helps!

Tom

Jul 29, 2009 | Olympus FE-280 Digital Camera

1 Answer

This is exactly my problem.


Focus is stuck - could be sand or something in the focus gears. That's the weak spot for these lens. Contact your local Olympus service center or any other camera service center or me at toms.safranovs@gmail.com

Tom

Jul 28, 2009 | Olympus FE-170 Digital Camera

1 Answer

Toshiba Projection Picture discoloration


burn in on one of the tubes try magic focus?

Mar 12, 2007 | Toshiba 65HDX82 65" Rear Projection...

1 Answer

Spot metering on the Epson 3000z


The spot meter area is small because I have photographed 2 people side by side many times, focused on ones chest then found that the "spot" had slipped into the little space between them, the bad focus not really showing up when I checked the LCD. (My eyes are old and so are my glasses.) Got home and found useless pictures. Sometimes I was outdoors in the sun and couldnt check the LCD. Some of the threads say the focus spot is "off center" with no acccurate way of finding it when using the viewfinder. I take some beautiful, wonderful pictures but these errors really tear me up. I've got to get the LCD box viewer with the 2x lens viewer I guess. All those years as a 35mm Canon F1 user I would long for a spot meter almost daily. Now I see that a matrix meter AND a spot is the real choice. I hope eventually to learn to outwit my 3000Z because it does give me such excellent pictures. Sometimes there is noise on a face, sometimes it is the focus and at functions it is so embarassing to ask a principal subject to wait because the *** or ***H procedures take so long. A wedding, other than the reception, would be near impossible in *** or higher. Good Luck, Dav.

Sep 13, 2005 | Epson PhotoPC 3000Z Digital Camera

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