Guide :Optics : Specialty 56TN (200 x 50mm) Telescope

Lense, objective need a 50 mm objective lens for a tasco 3 B brass telescope. focal length apparently is 14 inches.

Posted by t d taylor on Sep 25, 2006

Research, Knowledge and Information :


Tasco Telescopes... why they are bad and how to fix them up


... and a decent objective lens. ... the problem is that most of the telescopes that Tasco markets do not need a barlow lens to ... My telescope focal length is ...
Read More At : www.rocketroberts.com...

astronomical optics, part 2: telescope & eyepiece combined


... as it would appear from a focal length of a single objective lens ... telescope, where the tube diameter is ~50 mm ... Astronomical Optics, Part 2: Telescope ...
Read More At : www.handprint.com...

INSTRUCTION MANUAL - Tasco


INSTRUCTION MANUAL LIT. #: 9303710405 ... being used and the focal length of the telescope. 2. ... (telescope) in mm FL (eyepiece) EYE LENS CHART & THEORETICAL POWER ...
Read More At : www.tasco.com...

Binoculars - Wikipedia


... The ratio of the focal length of the eyepiece divided into the focal length of the objective ... 50 mm is a common ... binoculars with a larger objective lens, ...
Read More At : en.wikipedia.org...

telescope facts, information, pictures | Encyclopedia.com ...


The focal point of the objective lens was behind the eyepiece, ... a telescope with a focal length of 60 in. ... (1.8 m) across but only 3 in. (76 mm) thick, ...
Read More At : www.encyclopedia.com...

Unitron Model 114 - 2.4" (60mm) Achromatic Telescope


... Objective Lens of the Unitron 2.4 inch ... may wrongly attribute to originating in the telescope objective lens. ... 2.4 inches (60.72 mm) Focal Length: 35.43 ...
Read More At : www.company7.com...

Cost Of Tasco Telescope 110450 Electronics Telescopes ...


cost of tasco telescope ... Adjustable aluminum tripod 60x magnification Focal ratio: F/11.7 Objective lens dia: 700mm ... 16 / 453.6 Length (in./mm): 14 / 336 ...
Read More At : au.shopping.com...

Vortex Razor HD 5-20x50 Tactical Rifle Scope w/ Illuminated ...


Shop Vortex Razor HD 5-20x50 Tactical Rifle Scope w/ Illuminated Reticle-Up To 15% OFF with 4.9 ... Flip Cap Objective Lens 50,55-59 mm, ... Length: 15.8 inches:
Read More At : www.opticsplanet.com...

Celestron - Official Site


Behind every lens and mirror lie our ... For over 50 years, Celestron telescopes have led ... Everything you need to complete your telescope setup: power ...
Read More At : www.celestron.com...

Suggested Questions And Answer :


Lense, objective need a 50 mm objective lens for a tasco 3 B brass telescope. focal length apparently is 14 inches.


Here's the link to the manual if you need it; http://www.tasco.com/products/manuals/specialty_30076150.pdf call; 1-800-423-3537 and they will be able to tell you how to get a replacement OL Hope this helps :)
Read More At : Specialty 56TN (200 x 50mm) Telescope...

Hey guys! My brothers chipped in to get me a telescope for my birthday. It's a celestron sky prodigy 70. I took it out a few times with zero experience except for what I picked up from reading the owner manual. Please excuse my language as I do not know any common terminology nor am I very good at trig but I at least know the terms relating to math( if thats what it really is talking about). So, when I look through the lens I get a nice sharp and crisp image with the factory provided lens. I know this is an entry level telescope but I want more magnification. So I bought an x-cel lx 2x Barlow lens and a 24mm-8mm zoom lens. I know the max magnification is 165x and the focal length is 700 so that puts my strongest eye piece at a little over 4mm meaning a 5mm is pretty much what I'll get out of it. I tried the Barlow and the zoom lens a smidge over 8 (9 I hope it was at) and the image is very soft. Then again I am in Los Angeles and looking out of my window through a fairly heavy marine layer. But the image comes out sharp if I use my factory lens, or just the zoom, or my already provided 24mm with the Barlow or the zoom at a lower magnification with the Barlow. My provided 9mm with the Barlow produces a blurred image and I tried to focus but it still seems blurry at best. I think I'm safe to say a 9mm on a 2x Barlow is still within the max effective range of zoom? I'm wondering if I shouldn't expect much out of the telescope or if I should return either the Barlow or the zoom lens or both and get some higher quality object specific lens instead. Or maybe I'm not focusing correctly? Or a zoom should not be used on a Barlow? Any insight would be very helpful.


Hi, I can see you'r statring a interesting journey in amateur astronomy. Which can be really amazing but also disappointing, because usually people are expecting too much (specially after viewing beautiful astronomy pictures on internet).Before we go back to your question lets go over some basics here:Your telescope has a F10 aperture (Focal lenght / Diameter).So to be able to see the maximum amount of details from it, the smallest eyepiece you need is a 10mm (eyepiece mm = to f number of thetelescope).Then it's easy to find the maximum useful magnification: 700mm (focal lenght) / 10mm (eyepiece) = 70x Ok but why does the manufacturer say that it can be at a max of 170x... they are not really lying, if you get a smaller eyepiece it will make the image bigger but will show no additional details than a 10mm one. But the image being bigger it can make details easier to see.That for the questions about magnification an image quality.The more pieces you put between you eye and the telescope mirror, the dimmer and less contrasty the image will be. Especially after you go higher that the maximum useful magnification.Hope this helps. And enjoy wathching the stars and planets, it is a always a beautiful sight.
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No matter what lens specification i install of the 3 that were supplid by meade, the object( any object.......the moon in this particular case) is never in focus. it is only ever in sharp focus when i move the eyepiece about an inch away from the telescope and hold it in my hand. not ideal i know, but the moon does then appear in very sharp focus. its as id the size of the eyepiece lens is too small. what to do. whats missing?


If possible turn the lens extension around. also there should be an adjustment you can make right on the eyepeice. turn it left or right
Read More At : Meade ETX-70AT Astro Telescope 0705-04-10 with 494 Autostar......

Unable to see out telescope, might be missing a lens


You need a "diagonal" and an eyepiece on the "small end" of the telescope-- where the focus knobs are located.Do you have these pieces? If you do put the eyepiece with the LARGEST number written on it into the diagonal and then put the diagonal into the telescope. The bigger the number the LESS magnification.Go outside during the day and practice focusing on a distant object at least 100 yards away --- the lower magnification helps you learn how to focus.
Read More At : Deep Space 78-9512 (120 x 60mm) Telescope...

I need a new tri-pod - Tasco Specialty 56TN (200 x 50mm) Telescope


Not worth it. Buy a better scope (Meade, Celestron or Orion) and save frustration
Read More At : Specialty 56TN (200 x 50mm) Telescope...

Bushnell Telescope 78-4678


A telescope like that has a very narrow depth-of-field, so you need to focus very, very slowly to be able to see any image. Try focusing on something bigger (like a spot on the moon) and adjust the crosshair accordingly. The two eyepieces gives different magnification.
Read More At : 675x5 EQ Reflector Telescope...

No manual to reassemble bushnell telescope model 78-9512 700mm focal length 60mm objective lens(f/11.7) i dont know if i even have all the right parts for this telescope or not. it was in the attic , its my sisters & i told her i would try to put it together for her!


All of bushnells manuals are on this web site:http://www.opticsplanet.net/bushnell-warranty.html
Read More At : Bushnell...

I am looking for Galileo cc-2 replacement parts. I have no idea what any of these parts are because I know nothing about telescopes. There is no lens in the eyepiece, so I need to replace whatever is needed.The only numbers I can find are the cc-2 model number along with 700mm focal length and 60mm objective. If any one has an idea on where to get some help on this I would be greatly appreciative. Thanks for your time, Joe


Contact Galileo scopes directly HERE:http://www.galileosplace.com/
Read More At : (G118DX) Telescope...

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