Question about Tasco 750 Monocular Microscope

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Eye piece The eye piece rotates. If some spots you can only see black. The base of the eye piece seems a little lose. Any suggestions?

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I have an Orion SkyQuest XT8 Dobsonian. I have had it for 6 years or so. I can't see anything through the eye pieces. It just has black spots. is it the eye pieces or the telescope?


Put the eyepiece with the largest number written on it into the focuser. Go outside during the day time and practice focusing on a distant object.

Watch this video --
http://www.andysshotglass.com/Collimating.html

May 11, 2010 | Orion SkyQuest XT8 Dobsonian Telescope

1 Answer

I need a replacement rubber eye guard for the eye piece on my read head spotting scope. Any ideas?


I'm looking for a replacement eye guard for my finder scope and this place looks first class!

http://www.anchoroptics.com/catalog/product.cfm?id=195

Eric in NZ

Dec 31, 2009 | Redhead Optics

3 Answers

I have an AA Mini Maglite and it quit working. I replaced the two batteries and lamp and still does not work. Any suggestions?


I have several of these flashlights and experienced the same problem. Here's my solution: take off the light end and you will see a black base where the bulb is inserted into. The black base rotates. If all else is functional (batteries, bulbs, etc.), when you rotate this black base, the light should come on. Moving the base back and forth several times seems to help also (it seems there must be some kind of contact problem). All that's left is replacing the light end.

Jun 18, 2009 | MagLite Mag Lite Led 2 Cell Aa Flashlight...

2 Answers

Black spot in the center of the image viewed in telescope


If this is a Newtonian reflector or a catadioptric scope (Schmidt Cassegrain or Maksutov) you may be trying to use it at too low of a magnification. Your magnification needs to be high enough that the exit pupil is less than 5 mm; to figure this divide the focal length of the eyepiece by the f-ratio of the optical tube. If this quotient is 5 mm or more the black spot you are seeing is the shadow of the secondary mirror.

Dec 14, 2008 | Celestron NexStar 5 SE (300 x 44.45mm)...

1 Answer

Pltv-4250 post


YOU NEED TO INSERT A FLAT BLADE SCREW DRIVER BETWEEN THE PIECES AT THE TOP OR BOTTOM EDGES. THERE IS A LITTLE EDGE ON THE INSIDE OF ONE PIECE AND A SLOT ON THE OTHER PIECE THAT LOCK THE 2 PIECES TOGETHER. EVERY 4 TO 5 INCHES THERE IS ANOTHER LITTLE LOCK PIECE.

Dec 07, 2008 | Protron PLTV-4250 42 in. LCD Television

1 Answer

15x45 eye piece


call bushnell@18004233537 for your nearest distributor good luck...larry@reichinstruments.com

Nov 19, 2008 | Bushnell Optics

1 Answer

Auto focus


there should be a tiny little switch on the lens that shows 'AF' and 'MF'.  Make sure it is on 'AF' for auto-focus.  Also, is the lens rotating and locking fully?

Oct 11, 2007 | Nikon D50 Digital Camera

1 Answer

RA11 A Spotting scope


I did a little research for you. Check your manual but I think your "eye piece" has a 12.5mm thread into the body of the scope. The FSA-L1 has a 15.2mm thread which goes in the place of and replaces the eye piece for the models it fits. Check that manual too. If you have calipers you can verify it too by measuring the male thread of each. What you need if you can find it is a 12.5mm (male) to 15.2mm (female)adapter. Becareful it doesn't change the focal length. Check with photo shops or on-line. I'll do a quick search too and repost if I find one.

Jul 16, 2007 | Nikon Sky & Earth 7455 (20-60x80 mm)

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