Question about Kowa TSN-601

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A prism has come loose and came out of the eye piece socket when I tipped it up. Is there any way of opening the body so I can set it back in position?

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You dont say wich scope you have, by the looks of photo the objective housing screws off then way down inside you should see 3 screws wich hold it together...larry 5088331232

Posted on Jun 22, 2009


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1 Answer

What are the size specs for a K4

- Magnification: 10x50mm
- Finish: Rubber Armor
- Prism: Roof
- Exit Pupil (mm): 5.00
- Field of View ft 100yds/m 100m: 287/96
- Eye Relief (in./mm): 17.0
- Length (in./mm): 6.5/165
- Width (in./mm): 5.2/133
- Weight (oz./g): 22.93/650

Nov 02, 2016 | Optics

1 Answer

How do I get rid of the dark shadow across the top of the screen?

This is actually a fairly common issue with the NEC projectors, especially if they are mounted from the ceiling (upside down). The problem is the compartment immediately after the bulb. What happens is the 'paste' they use to adhere the glass prisms to it's plastic component wears off overtime due to the immense heat from the bulb being projected onto it. The glass prism piece ends up leaning against the bulb compartment creating the annoying 'shadow'.

Heads up; you will need to take apart almost the whole projector. You'll need to expose the mirror array to get to the compartment just after the bulb. Once you've dissassembled the projector down to the mirror array, take out the problem part. It's a small black plastic cube frame that's held in by a screw and has 3 glass/plastic prism pieces. Looking down at the disassembled projector, you may not be able to see the glass/plastic prism pieces but I can assure you that it is the small compartment immediately after the bulb compartment.

Once you've identified the component and taken it out, you'll see the prism piece(s). The problem prism is the one that sits closest to the bulb and it was either slightly loose or had fallen off completely. Please note that there is another one of these exact prisms on the other side of the assembly you pulled out just behind the plastic looking prism. This secondary one come loose very rarely but if it does, you'll need to fix that too.

The Fix: Since the component is going to be exposed to immense heat again, you'll need to buy an adhesive that can withstand that heat (think at least a few hundred degrees for safety sake). I bought the JB-Weld Steel Reinforced Epoxy since it can withstand heat up to 550F. Make sure you read the instructions before starting. An added suggestion is to scrape all the old residue from the old adhesive off the component and prism(s) first, then scratch some grooves into the connecting pieces and apply the epoxy/adhesive. Do not scratch up the actual prism itself; scratch the 'extra' glass on the prism piece where it will connect with the plastic component. The grooves help the epoxy bind to the pieces and I highly suggest this since I've had to re-do a few in under a year. Let the epoxy set for a good 24 hours before putting the projector back together.

Nov 03, 2014 | NEC NP400 Projector

1 Answer

Cracked view finder

That would depend on which part of the viewfinder that needs repair or replacement. If it's the piece of glass at the very back, where you put your eye, it wouldn't be that expensive. If it's the prism inside the hump atop the camera then it would be quite expensive.

May 27, 2013 | Pentax K20D Digital Camera

1 Answer

My 18x50 IS binoculars are broken; the right eye piece won't focus and I hear a clunk inside when I turn it over; the left focuses just fine. What can I do and where; here in las vegas?

Sounds like you've dislodged one of the prisms inside. A service center can look it over for you, but from personal experience, it's cheaper to replace them than pay to ship them to/from the service folks plus the estimation fee just to find out that they'll have to be replaced, anyway. Sorry.

Jul 24, 2012 | Canon (18x50) IS Binocular

1 Answer

Why is there a piece of crushed glass in the veiwing area between the eye piece an the mirrior

The camera may have been dropped and something in the prism is broken.
Some cameras have removable focusing screens are made to look like frosted glass, grids, and center spots

Feb 19, 2011 | Photography

1 Answer

I have a pair of Plastimo military binoculars which have been fine up to now, but suddenly, despite being able to focus using the two eye piece controls, I cannot get anything other than a double image, no...

Hello - I never had Plastimo before but I have had a similar problem with double vision on a very similar looking pair of binoculars.
The eye piece movement just re-aligns eye focus differences , a double image usually means one of the lenses has moved inside the main tube. (usually from a knock/fall etc)
Can you rotate either one of the tubes ? On my pair I had to rotate anti-clockwide and found a prism inside that had slipped after a fall -
Close one eye and try to gauge which side is the best side -- Ray

Feb 05, 2011 | Plastimo Optics

2 Answers

How to open HP DeskJet 656c printer

there will be a rectangular piece and on both sides use a screw driver and open it .. trust me i have opened mine.. but u cant tight that socket.

Feb 11, 2010 | HP DeskJet 656c InkJet Printer

1 Answer

Need to know what diagonal and eyepiece to use

The old Celestron C90's used 0.935" diameter accessories. You can check this yourself by measuring the opening at the back of the C90 with a ruler. Preferably, you would want to get a 1-1/4" visual back for the C90 so that you can use the far more common 1-1/4" diameter telescope eyepieces and accessories.

If you are planning on doing terrestrial observations, you can use a Porro prism to get a correctly oriented image, or you can use a 90 degree angled Amici roof prism to get a correctly oriented image. If you plan on doing celestial viewing, a simple 90 degree diagonal will suffice since it really doesn't matter if the image is reversed left to right.

Various focal length eyepieces merely give you different magnifications with the telescope. To find the magnification, simply divide the telescope's focal length (1200mm) by the focal length of the eyepiece. A 25mm eyepiece, for example, would give you a magnification of 1200/25 = 48 power.

Modern eyepieces are available which provide a variety of magnifications, yet which also have a consistent eye relief (distance from the top of the eyepiece to your eyeball) of around 20mm. This is very handy, especially when using higher magnifications, since these eyepieces are much easier to look through and since they can be used if you must wear eyeglasses to correct for astigmatism within your eyes.

Orion telescope center has knowledgeable staff who can help you choose a good set of eyepieces and accessories to use with your C90.

Mar 23, 2009 | Cameras

2 Answers

I fell and now the two eye pieces are out of alignment.

This a problem with the prisms in the main body of the binoculars. It would seem that one or more have moved (there are four). Realigning is a difficult job but not impossible. Depending on the design, it should be possible to gain access to two of them, and hopefully you will see which one has moved. When aligned at factory, the prisms are usually held in place with a flat or “leaf” spring, and spots of paint/glue. This may give you a clue when you examine the prisms, and compare both sides.
To gain access to the bottom two prisms, try unscrewing the objective lens tube (the conical bit) from the main body, You may also need to remove one or two tiny screws that hold the protector plate in place. Do both sides at the same time so you can compare. With any luck, you might be able to re-seat the jarred prism to its original place. The top two prisms are harder to get to requiring the dissasembly of the focus mechanism, but if you go carefuly, you may get lucky, after all you have nothing to loose. Remember that binocular alignment does not need to be perfect, if it’s pretty close, the brain will compensate for any minor inaccuracies.
Please contact for further information
Kind Regards….Dave

Jan 03, 2009 | Swift Ultra-Lite 762 Binocular

1 Answer

Canon SPEEDLITE 580EX - How do I replace the hotshoe mount?

These instructions are for the 550ex and I imagine that the bodies of the flash units are the same.

As with any project, make sure to get a good workspace with plenty of light where you won't drop any screws and lose them...

1) There are 4 screws on the bottom of the flash unit that you'll want to unscrew first. Carefully tilt back the bottom section away from the red filter which covers the "eye".

2) There is a set of wires going to a white harness in the piece you just tilted off which you can carefully disconnect with a small flathead screwdriver working it on either side.

3) The same type of harness attaches another set of wires but this one is just inside the body of the flash in the cavity you just opened up. This one is a bit wider and you should undo that harness in the same, careful manner.

4) Next, you have to remove the master/slave switch which is attached with two small screws that you'll need to carefully undo. The actual switch is attached to the tiny board you are unscrewing. There is a plate covering that switch that is the piece you actually push when you want to switch it. That piece will come out when you take the actual switch out so remember which direction it went.

5) Now you should have exposed four small screws as you look straight down into the piece you're working with. These screws hold on the shoe you're replacing. With some decent force against the screws, carefully unscrew them. These don't come out very easily so you want to make sure you have the right sized screwdriver that fits and that you're applying some downward force. MAKE SURE you don't strip the head on these screws.

6) Turn the whole piece so that the shoe is facing upwards. Now you can carefully pull off the shoe. Make sure to not lose the loose spring that is under this thing. You'll see that there are 5 prongs sticking up, a horizontal metal piece, and a small rod looking piece with a spring that fits over it. Take note of how these all go so you can put the new one on with those pieces in the right places.

7) Put the new piece on and screw everything back in the reverse order. Voila! You just saved yourself a bunch of money and hassle. Thanks for the tip on where to get that piece, by the way, I had been looking around for it.

Feb 19, 2008 | Canon SPEEDLITE 580EX TTL Flash

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