How Can I Decrease A Telescope’s Magnification Without Changing The Eyepiece?
Thursday, December 24th, 2009 at
4:23 am
I have this cheap telescope that I want to manipulate to increase it's field of view/decrease magnification for an electronic eyepiece. Is there something I can do with the primary mirror? Do companies make the reverse of barlow lenses?
 |
 Zhumell 125 MOON Telescope Eyepiece Filter NEW  US $11.99
|
 Meade 15MM multicoated 125 plossl telescope eyepiece US $19.95
|
 Digital Eyepiece for Telescope View and Record to Computer US $79.50
|
 Celestron telescope eyepiece accessory case US $35.88
|
 Zhumell Astronomy 125 BARLOW 2X Telescope Eyepiece NEW US $29.99
|
 NEW Zhumell 32mm Plossl 125 Telescope Eyepiece US $27.65
|
There are “focal reducers” that shorten the focal length of refractors. This is the opposite of the Barlow lens.
You can buy them, but they are specifically designed for particular scopes, and are expensive, probably more than what your scope costs. They come in 0.33, 0.50, and 0.63 power.
Making your own is possible. If you get two long focus objective lenses (a pair of front lenses from 7×35 binoculars) held close together, curved side almost touching curved side, that would be a good one.
You cannot use this on a mirror telescope like a Newtonian because there is not enough space between the small diagonal mirror and focusing eyepiece to put one.
There is nothing you can do with the primary mirror to change the way it focuses light.
The 0.5x variety will screw into the bottom of your eyepiece and work well. Shop around on line for the best price for you. the link below is just an example.
Thank you.
Most things published by the US Federal government are done so copyright-free. If they are copyrighted, you will see the little "c-in-a-circle" or "r-in-a-circle" (signifying a registered copyright).
If they are copyright free, you can use 'em however you please. Otherwise, contact the holder and ask for permission.
Dropbox is changing my life. Hand sanitzer is out. Dropbox is the new Jesus
Are convenience stores in your part of the world always changing their items, or… Related posts:Conbini Monday Wk6 Conbini Monday – Week 1 （コンビニマンデー） Conbini Monday Wk29
*How to be Happy and Have Fun Changing the World ☺ by Michael Anthony Free E-Book How to be Happy and Have Fun Changing the World Copyright © 2005, revised 2006 by Michael Anthony. All rights reserved. In order to share the insights contained in this book with as many individuals as possible, Michael Anthony gives you permission to copy this book in any form you wish for your own use or to give it to others. You are not given permission to modify it in any way, or sell or charge money for this book in any form under any circumstances. After you read my Happy eBook, if you feel its insights ha
Generally you use a telescope with an eyepiece. It's possible to get video hookups that let you view the image on a screen but I think this is far less enjoyable and gives you less flexibility.
I acquired the Retinal Magnification item on Champions Online!
#smlthankyou for the info! Where can I get them?
i so agree
it feels wrong without herrr. D:
can you use a diagonal on a reflector?
At least the #iPad has #accessibility features I could use: VoiceOver screen reader • Full-screen zoom magnification • White on black.
It’s like going around in circles talking to a 5 year old girl with some of you 14-16yr olds, who simply don’t understand the crux of the issue despite very clear points being made. Listening to you lot believe so much rubbish is akin to a parent looking at their children who believe in the tooth fairy and the parents smile over them, due to the naivety of the children. Wallowing in your own conceit does not in any way contravene the truth, despite the fact you are willingly ignorant.
Use Mailloop to decrease your workload, and automate keeping your e-mail list "clean" to prevent spam complaints -
My philosophy has been to go with field rather than power. Higher numbers on eyepieces give you a smaller power (40mm = 85x for example). The lower the power the wider the FOV (Field Of View). A 28mm Plossel eyepiece is my favorite. It gives me some power without sacrificing a wide field. The narrower the FOV the harder it is to; 1) focus and 2) keep the object in view (unless you have super perfect polar alignment).
Best of Alexander Bain EBook Collection 1.0 Category: Books Price: $0.99 (iTunes) Description: Salamander E-Book Reader proudly presents a great collection of classic books. Enjoy the convenience of the digital E-Book Reader while capturing the essence of conventional books from your favorite authors. About Salamander E-Book Reader: The Salamander E-Book Reader brings together all the convenience of the digital books, while making sure to not lose the essence of conventional books. With the ability to change the colors, fonts, sizes and more, you can customize your reader to look just the way you want. With several of the classics and more available for you to download through our collections, you will find hours of entertainment through these books for a minimal cost. Application features: The Salamander E-book Reader works like a teleprompter to move through the book. There is no need to flick through pages. Other features include: • Auto-Scroll • Copy and Paste • Text magnification…
Autumn. Usually October sometime.
#6: Bausch & Lomb Magna Visor Magnifying Visor 81-42-00 With 3 Lenses 1.8x, 2.2x, 2.6x Magnification Power
Hong Kong Airport Posts a 5% Decrease in 2009 Passenger Traffic.
3000th view!!!!!
Check Out Sony FDAECF20 Eyepiece Corrector Diopter +2 for Sony Alpha Digital SLR Camera $16.99
Thanks!!!NICE VIDEO!
The atmosphere distorts images and of course is where weather happens; you can't use an optical telescope through clouds. Space based telescopes do not have this problem … they essentially have unrestricted views from outside our atmosphere.
You can decrease or increase the concentration of a specific solution by adding less or more solutes, respectively, OR increase or decrease water, respectively.
Adding more tap water to the solution dilutes it, which indeed decreases the concentration.
And yes, adding more solutes such as FeSO4 and oxalic acid will increase the concentration of their respective solutions. (adding more FeSO4 to an oxalic acid solution will not increase its concentration, but adding more oxalic acid to an oxalic acid solution will increase its concentration)
try to talk louder i cant even hear u!
drawing a dicot stem at 40x magnification…#likeaboss
Given that Chile is one of the most seismically active countries in the world, how do astronomers protect their giant telescopes that have been built or are being built in the Chilean Andes? This blog post discusses how Chile’s most advanced facility — the European Southern Observatory’s Very Large Telescope (VLT) — protects its precious 8.2-metre primary mirrors in the event of an earthquake.
Leona is The Best!!!
I can’t live without this song!!!!!!
Microsoft’s constant changing of .NET is not good for the industry; the release train method for open-source projects is good Visit website for full story…
Well, …, The larger the aperture the more you can see. They the following quick and easy experiment:
Close your left eye, form a very small "OK" with your right hand and look through the center hole will your right eye. Take a mental note of everything you can see. Now open the "OK" and look again. You'll immediately be able to see more. The ability to gather light, NOT MAGNIFICATION, enables you to see more. Thus a 6" refractor can see much much more at lower power than an 80mm (3.1 in) refractor.
We use mirrors more commonly because:
1) Large mirrors are much easier to make
2) There's a limit to the about of glass that can go into a lens before light can no longer pass through the lens of the lens becomes so large that it breaks from its own weight.
3) It's much easier to remove chromatic distortion from a mirror than a lense.
4) Mirrors are cheaper to make.
Google Sky?
Today in Washington, we’re hosting the first-ever ARPA-E Energy Innovation Summit. We’re bringing together some of our nation’s brightest minds in science, engineering, and business to focus on tackling the energy problem. Through the ARPA-E program, we are funding cutting-edge technologies that could provide game-changing breakthroughs. We’re trying to hit home runs, not base hits.
This video showcases one of the projects we funded in the first round of applications: Sun Catalytix. Sun Catalytix is developing a unique technology that mimics photosynthesis to split water into hydrogen and oxygen. Check it out:
var params = { allowscriptaccess: “always”, allowfullscreen: “true” }; “flashcontent2″, “480″, “295″, “8″, null, {}, params);
Viewing this video requires Adobe Flash Player 8 or higher. Download the free player.
Steven Chu is Secretary of Energy
Specifications:
Brand new and high quality This extension tube set provides 3 extension tubes that can be added between the camera and the lens, to make the lens focus at closer distances and produce higher magnification. Extension tubes are metal tubes with a rear-lens mount at one end and a camera-body mount at the other end This extension tube set does not affect image quality as there is no optics inside. In comparison, a close up filters are often blamed for degrading image quality. It moves the lens farther from the film or digital sensor Suitable for all Olympus 4/3 mount DSLR/SLR camera Color: Black Material: Aluminium alloy Size: 65 x 58mm / 2.6 x 2.3in(L x W)
Package Included:
1 x MASSA Macro Extension Tube Ring Set for Olympus OM 4/3 DSLR
dirty air filter or spark plugs
Video: Obama tells crowd their insurance premiums will decrease by 3000%
RT High Magnification, Unisex Readers, HALF FRAME, 5.00 Strength, by American Reading Glasses -
Why the flip do designers make dresses with side zips? I'm stuck in changing room with dress half zipped up and I can't zip it myself. ARSE
Beta gucan: 10 mg, 1 capsule twice daitly for the rest of your life. Beta glucans have been shown to protect the patient from the side effects of radiation therapy.
The borrowers who can take advantage of the Bank of America program must also qualify for the Obama administration’s $75 billion mortgage loan modification program.
I got mine for $179 + shipping on For $300, or just a bit more you could probably find an ETX, I’d say keep looking or offer less.
I'll do the 2.5. I want it for focus certianly but also to have something to use as an eyepiece to frame shots and block light etc
I love this song so beautiful!!
Update Jerdon HL65G Eclipse 5X Halo Lighted Mirror, 8", 5X-1X Magnification, Bright Brass
Oh well, there went my answer!
tags: birds, mystery bird, bird ID quiz
[Mystery bird] photographed on Bolivar Peninsula, Galveston County, Texas. [I will identify this bird for you in 48 hours]
Image: Joseph Kennedy, 27 May 2007 [larger view].
Nikon D200, Kowa 883 telescope with TSN-PZ camera eyepiece 1/1000s f/1.0 at 1000.0mm iso400.
Please name at least one field mark that supports your identification.
Read the rest of this post… | Read the comments on this post…
Anyone know about telescopes?: Ok…..don't laugh….but this might be THE first 'planning for Christmas' thread…..
An OIII filter will be the best for most nebulae…I use Orion's myself.