The Binocular & Telescope Blog!

Perhaps a mirror telescope primary practices as a mirror reflecting?

I can not find a vendor scope property or an optical shop in our place that sells customizable mirror. I plan to buy a mirror and use it as a primary mirror reflecting a range of. I heard that the focal length can be short. How short is the average length of a center mirror lens? Is it too short to be used in a telescope or passable as a mirror scope of medium quality? I have not bought one and measured.

When you say "magnifying mirror," what comes to mind is a mirror to shave or may be used as an overhead mirror. These mirrors are extremely poor optical quality. For astronomy, you must have a precision ground mirror. If you do not find a used one cheap so it is best to grind yourself. Here are some links to the telescope construction do-it-yourself and mirror grinding.

telescope mirror grinding

20 inch Parabolic Dobsonian Telescope Primary Mirror £1,632.80

2″ pushfit Premium Dielectric telescope Mirror Diagonal £73.99

NEW 2 inch telescope mirror diagonal with 1.25″ adapter £29.40

TELESCOPE DIAGONAL 1.25 ” STAR MIRROR FULL MULTICOATED £21.53

TELESCOPE 2″ MIRROR DIAGONAL WITH 1.25″ ADAPTER £32.64

Tasco Telescope 302003 Rear Mirror £4.99

Tasco Telescope 302003 Mirror £4.99

Deluxe Laser Collimator to align your Telescope Mirrors £30.71

TELESCOPE SECONDARY MIRROR 2.7 inch £50.93

TELESCOPE SECONDARY MIRROR 2.3 inch £41.13

TELESCOPE SECONDARY MIRROR 2.3 inch £41.13

Laser & Cheshire Collimator for Telescope Mirrors £49.00

Photographic Print of Polishing the mirror of the Hubble Telescope, 1980s. from Heritage-Images £10.00 10×8 Print. Printed on Fuji Crystal Archive paper for stable image permanence and brilliant colour reproduction with accurate colour rendition and smooth tones. Enhanced sharpness with excellent definition. Paper size approx 254×203mm…

Photographic Print of Sir Winston Churchill from Mirror Photos £8.99 10×8 Print. Printed on 254×203mm Fuji Crystal Archive paper for stable image permanence and brilliant colour reproduction with smooth tones, enhanced sharpness, and excellent definition….

Photographic Print of Will Hay from Mirror Photos £8.99 10×8 Print. Printed on 254×203mm Fuji Crystal Archive paper for stable image permanence and brilliant colour reproduction with smooth tones, enhanced sharpness, and excellent definition….

Sky & Telescope’s Mirror-Image Moon Map Laminated £0.31 …

Mirror, Mirror: A History of the Human Love Affair with Reflection £8.99 …

Mirror, Mirror: A History of the Human Love Affair with Reflection £11.69 …

Deluxe Reflector Telescope Hi Precision 114 x 1000 4.5 inch mirror £149.97 This advanced reflector telescope provides an excellent view on planets, the milky way and other phenomenons by night. Including aluminium tripod….

Flip Mirror System #647 UHTC 2 £218.98 Flip the mirror down to center an an image while viewing with an eyepiece at 90º, or… Flip the mirror up to pass light to the CCD chip or film plane of a 35mm camera. Includes 2″ eyepiece-holder and 1.25″ eyepiece adapter permitting use of either 1.25″…

the strength of a laser pointer should be permanently injure eyes?

I am thinking of buying a laser pointer and found Some of these can burn through the black plastic, pop balloons, light candles and matches, and the skin puncture. However, I do not want to hurt anyone or myself. So how does a strong laser pointer should be to injure the eyes? How long will it be in the eye? if it is accidental or two seconds causes permanent damage?

There are two limitations that you need to worry. The first, the threshold of damage the eyes, is about 1 mW. It's actually a fairly low power laser pointer, laser pointers as a go. But 1 mW, the laser can cause damage and your eyes if you look at it. However, the most visible lasers are considered relatively safe under 5 mW. This is because for lasers this power, if they have more power than necessary to hurt your eyes, damage occurs more slowly than you blink. So, your instinct will be flashing and look away before serious damage can occur. What makes these types of lasers relatively safe. Now, without doubt, if you look in such a laser and try to ignore your blink reflex, you can certainly affect your vision of such a laser. Over 5 mW, the damage occurs faster than you can blink, so these lasers are not considered safe. To put this into prospective, the sun will give you about as much power as a laser 1 mW. And, of course, you're not supposed to look in one or the other source of light. For something popping balloons, you need somewhere around 100 mW, which is more than a blink 5 mW threshold and instantly cause permanent damage to your vision. For a laser hurts when you shine it on your skin, you need about 500 mW, which is a very powerful laser and can light up a room very easily. All this depends on many factors such as the diameter of the beam, if there is any kind of development, and to some extent, the wavelength of the laser. For example, ultraviolet radiation 1 mW infrared laser is considered dangerous because you do not blink reflex of these invisible wavelengths. But for visible lasers, The figures I gave you are appropriate for the type of beam you get laser pointers. And in any case (unless directed by a doctor) If you look across the laser beam, and you should always avoid eye contact. Regarding the medical optometry, who said that the laser is legally mandated to be sure, he knows not what he speaks. All knives are safe? As a physicist who deals with lasers at risk every day, I can tell you that without a doubt, the most legal and laser pointers can damage your eyes if you look in the security measures or Ingoré simple.

Modify Your Laser Pointer

Deluxe laser pointer bracket, telescope finder £34.99

Laser Pointer Kaleidoscope Green £14.99 An absolute favourite here – we’ve all got one of these Laser Pointers. Looks like a slim, stylish pen, but emits a bright clear green laser that can be projected on to surfaces both near and far. By turning the pen (as you would do a normal pen to raise the nib), the pattern changes but is always, quite simply stunning. Can be used at parties and rave nights, or switch it on and …

Laser Pointer, 4 in 1 (Class 2 Power £26.17 This multi-purpose Laser Pointer (Class 2 Power …

Laser Pointer with LED Light (Class 2 Power £10.56 The ideal gift for gadget lovers everywhere. This dual-purpose Laser Pointer (Class 2 Power …

Distance Estimator With Laser Pointer …

Kensington Si600 Wireless Presenter with Laser Pointer – Presentation remote control – radio £16.59 Kensington Si600 Wireless Presenter with Laser Pointer Presentation remote control radio 33374EU Mice Pointing Devices…

August Red Laser Presentation Pointer LP100 £4.49 …

SP400 Smart-Pointer (Silver/Chrome) 2.4Ghz RF Wireless Presenter with Mouse Function and Laser Pointer £29.99 Duronic SP400 Smart-Pointer 2.4Ghz RF Wireless Presenter with Mouse Function and Laser Pointer enables you to control your onscreen presentations within a range of 100 feet, making it the perfect tool to use in a large conference room. The presenter supports the most common PowerPoint presentation functions including Page Up, Page Down, Mouse Arrow, Right Click, Left Click, Darken Screen, and Resu…

TeckBase Cat Toys Dog Toys / 2 in 1 LED Laser Pointer with Key Ring £2.99 Ideal toy for your little pets. Watch them chase the Red dot from your laser pen!…

Best Telescopes To Buy

Buying a telescope can sometimes seem a pretty complex and involved process. There are so many aspects to consider: do you want a refracting or reflecting? What sort of magnification? Coated optics or multi-coated? Focal length specs? If you’re like most, you just want a middle-of-the-road quality telescope with a proven track record. Below, we’ve listed four of our favorite telescopes by optical industry legends, as well as basic tips on buying; to help you find just the right one for your home and family.

The Bushnell Voyager comes in reflector, refractor, and compact models, and is by far one of the best high-quality, high technology telescope brands in the optical industry. The reflector models offer resolute magnification, light-gathering technologies, 5mm and 27mm eyepieces, camera-adapting functions, and typically come with a carrying strap as they are the predominantly and conveniently portable model. The refracting Bushnell Voyager is a bit more expensive and less portable, but delivers better overall image quality; depending on your intended uses. The refractor models boasts about 5 times the magnification power, as well as light capabilities. They are also camera adaptable, have a finderscope, and zoom eyepieces. Either is an excellent choice, if you are looking for an affordable, quality telescope for casual but educational stargazing.

Galileo also offers top-quality, high performance telescopes; in reflecting and refracting models. The reflector boasts premium optics, powerful magnification, easy to navigate azimuth mounts, finderscopes, zoom eyepieces, and even easy-to-understand video tutorials. The refracting models also offer superior optical capabilities, finderscopes, zoom eyepieces, and azimuth mounts; plus 8 times the magnification and light-gathering technologies, interchangeable eyepieces, flip Barlow lenses, and interactive tutorials; again for a small price variance.

Two good choices are from Tasco: the Galaxsee Refractor or the Luminova Refractor or Reflector telescopes. The Galaxsee Refractor has an optimum magnification of 675, high light-gathering capabilities from a 60mm aperture, wide field of view, and equatorial mount for easy star tracking. Along with top quality resolution and accurate detail technology, the Galaxsee also boasts three premium eyepieces, red dot finderscope, and Barlow Lens. The Luminova Reflector and Refractor by Tasco both offer superior optics, powerful 675 magnification, 4.5mm or 60mm objective lens, wide field of view, multi-magnification eyepieces, slow-motion controls, adept finderscopes, and equatorial mounts for easy navigation and viewing.

Things To Keep In Mind
· Reflecting telescopes are slightly more cost-efficient than the more common refracting telescopes; but refracting telescopes typically boast way better optical accuracy and light-gathering technology.
· Higher-powered magnification is not always better, if it is not balanced with a larger objective lens or aperture. The higher the magnification, the more detailed, but also the more dark and obscured.
· The higher the focal length, the higher the magnification, and the narrower the field of view.
· The larger the aperture or objective lens, the more light will be allowed and the higher the resolution (accurate details).
· If the telescope of your choice doesn’t come with a book or video tutorial; make sure to invest in one. It greatly helps while searching the skies for stars, planets, and constellations; to be able to name them.

About the Author

Opticsale.com offers a wide selection of discount top-quality
telescopes
and accessories.

A Harmonic Geared Telescope Mount Moving b

Doumount for parallel use of 2 telescopes on one Mount £132.99

SKYWATCHER EXPLORER 130P EQ2 mount Telescope (712) £175.00

Telescope Reflector,StarScope TS 114/900 better mount £119.99

Telescope fixed pier mount base HEAVY DUTY £149.99

telescope helios reflector scope on eq2 mount 1.25 £75.00

TELESCOPE SKYWATCHER 130P PLUS EQ2 MOUNT £105.00

Telescope Reflector,StarScope TS 114/900 better mount £119.99

VIXEN SPHINX SXW TELESCOPE MOUNT & EXTRAS £99.00

STAR PARTY POWER-DISTRIBUTION-DRY-BOX-MOUNT-TELESCOPE £19.99

SKYWATCHER EVOSTAR 150 EQ5 mount Telescope (925/464) £689.00

Skywatcher HEQ5 Pro Synscan telescope mount £77.00

Celestron C8 SGT XLT GOTO Telescope + CG-5 GT EQ Mount £850.00

Professional observatory telescope mount for 40″ £19,601.44

Doumount for parallel use of 2 telescopes on one Mount £132.99

SKYWATCHER EXPLORER 150 P TELESCOPE AND EQ 3-2 MOUNT £199.00

Telescope Reflector,StarScope TS 114/900 better mount £119.99

NEW ASTROTRAC TT320X-AG TELESCOPE MOUNT WITH POLARSCOPE £424.00

Doumount for parallel use of 2 telescopes on one Mount £132.99

SKYWATCHER SKYMAX 150 Pro Telescope EQ5 Mount (885/464) £599.00

T2 T Mount Telescope Camera Lens Adapter for Canon EOS £6.49

SKYWATCHER EXPLORER 200P Telescope EQ5 mount (923/464) £379.00

Astronomical Telescope Equatorial Mount 75mm OG Fuller £450.00

Celestron Skyscout 90 telescope with 2 eyepieces +mount £175.00

C/CS -Mount adapter 1 1/4″ For CCTV cameras Telescopes £13.95

T-Mount Cap (M42×0.75mm Thread) Telescope/Cameras etc £2.95

TELESCOPE VIXEN PORTA MOUNT REG. $299 SALE PRICE $225 £147.01

iOptron Minitower GoTo altazimuth telescope mount £749.00

Telescope Goto Control USB RS232/Serial -Mount-cable £9.99

Telescope Reflector,StarScope TS 114/900 better mount £119.99

Doumount for parallel use of 2 telescopes on one Mount £132.99

RDF, TMB, ED, Phenix, Telescope, Eyepiece T mount Photo £0.99

Doumount for parallel use of 2 telescopes on one Mount £132.99

Telescope Reflector,StarScope TS 114/900 better mount £119.99

Telescope Reflector,StarScope TS 114/900 better mount £119.99

Telescope Reflector,StarScope TS 114/900 better mount £119.99

SKYWATCHER EQ5 Deluxe equatorial telescope mount (464) £225.00

Telescope Reflector,StarScope TS 114/900 better mount £119.99

Konus Motor 90 Equatorial Telescope £174.95 The Konus Motor range offers medium level astronomy at an economical price into this oldest of sciences. The Equatorial mount with R.A. tracking motor is quite stable, for smooth semi automatic tracking of celestial objects. The Konus Motor 90 refractor telescope features an impressive optical and mechanical quality that achieves great visual performance for astronomical observation. This tele…

Photographic Print of Pleiades star cluster from Science Photo Library £10.00 10×8 Print. Printed on 254×203mm Fuji Crystal Archive paper for stable image permanence and brilliant colour reproduction with smooth tones, enhanced sharpness, and excellent definition….

Photographic Print of False colour image of a solar flare from Skylab, 1973. from Heritage-Images £10.00 10×8 Print. Printed on Fuji Crystal Archive paper for stable image permanence and brilliant colour reproduction with accurate colour rendition and smooth tones. Enhanced sharpness with excellent definition. Paper size approx 254×203mm…

The Perfect Machine: Building the Palomar Telescope £10.05 …

The Perfect Machine: The Building the Palomar Telescope £18.65 …

Graham County (Arizona): Large Binocular Telescope, Mount Graham, Vatican Advanced Technology Telescope, Graham County, Thatcher, Safford £7.78 …

WINDOW MOUNT FOR SPOTTING SCOPE (770)-IDEAL FOR BIRD WATCHERS £12.50 WINDOW MOUNT FOR SPOTTING SCOPE. Heavy Duty Window Mount, fully adjustable 365° to give panoramic views from the comfort of your car, boat or caravan. Ideal for bird watching, stargazing etc. It is an optional extra for the High Powered Zoom Spotting Scope 20-60 x 60 -product code (748)…

Celestron 93602 Car Window Mount £19.67 Brand New – Ships same day, delivery 2-5 working days. 7 Day Money Back Guarantee. 10th Year online! – PicStop is an established retailer of Camera and Computer Accessories and Hardware….

Would this be a critical point where you remembered your Father?

…………….My Father’s Little Girl

Morning came long before the dew, the frost….
And morning came long before my Father…
He would never have allowed the frost to
Touch me…not my Father’s mornings…

Can I ever go back to his warm mornings
By the ceramic, floor heaters…if I could…
Yes, my Father, I would wrap you in my
Blankets, not let the cold in, not trouble

Your knees, legs…heart. Never.
But once, and only once, I saw my Father
Tremble, shiver…I was seven, and I had
No sight of it ever again…his anger.

His little girl had pneumonia…no one knew…
He did. Wrapped me in a blanket…
Needles…I.V.’s…oxygen tent…way back
When…

You see, my Father is a hero…not for the
Simplicity of understanding…but, by far…
His love of his little girl…his magnificent
Heart…

This Yellow Rose is
For his heart.

Picture of a man
Holding a little girls hand.
Yellow petals fall.

Elysabeth

Very sweet. Father would be so proud. My daughter gave me a framed picture of she and I, and inscribed on the chrome frame “Daddy’s Girl”. I was touched.

Dew Heater for telescope.

Rother Valley Optics 2 Channel Dew Heater Controller £39.99

Rother Valley Optics 4 Channel Dew Heater Controller £69.99

Dew-Not Heater Band for Binoviewer Eyepiece-Finder £43.99

Dew-Not Heater Band for 9″ Telescope Meade-Celestron £37.99

Dew-Not Heater Band for 8″ Telescope Meade-Celestron £34.99

Dew-Not Heater Band for 7″ Telescope Meade-Celestron £32.99

Dew-Not Heater Band for 6″ Telescope Meade-Celestron £30.99

Dew-Not Heater Band for 5″ Telescope Meade-Celestron £27.99

Dew-Not Heater Band for 4″ Telescope Meade-Celestron £25.99

Dew-Not Heater Band for 3″ Telescope Meade-Celestron £21.99

Dew-Not Heater Band for 2″ Eyepiece – Telescope £19.99

Dew-Not Heater Band for 16″ Telescope Meade-Celestron £47.99

Dew-Not Heater Band for 14″ Telescope Meade-Celestron £45.99

Dew-Not Heater Band for 12″ Telescope Meade-Celestron £43.99

Dew-Not Heater Band for 11″ Telescope Meade-Celestron £41.99

Dew-Not Heater Band for 10″ Telescope Meade-Celestron £39.99

Dew-Not Heater Band for 1.25″ Eyepiece – Telescope £18.99

Dew Mini Heater Controller £29.99 …

Dew Heater Kit to fit 3 & 4 Refractors £49.98 …

Revelation Pro 14 SCT Dew Heater £49.98 …

What should be in my Travel Medical Kit?

We are traveling to Costa Rica in April and we will tour the Guanacaste area, Arenal area,Manuel Antonio Area, and maybe the Monteverde Cloud Forest.
What have you taken to Costa Rica in your Medicine Kit and what did you think you should have taken along ???

I know the CDC Website and I have seen it. I just would like personal info/experience. THANKS!

Don’t forget a good mosquito repellent, I prefer the ones to spray on the skin so you don’t have to wash your hands on hiking. And the most important is ‘After bite’ if you get some bites, it relieves right away and you won’t getswollen spots. After Bite is available in the pharmacie at WalMart. If you cannot get After Bite you can also use the spray repellent instead it also helps.
I always bring a sterile disposable surgeon knife (scalpel) with me to open small wounds to clean it with Betadine fluid so they won’t get infected and sterile gauze pads for cleaning.

Aubrey’s Makeup Travel Kit

Travel Sewing Kit £0.01 Travel Sewing Kit…

European 5 Piece Blue GB Emergency Travel Kit Essential Items – H7 £25.95 Included within this European Travel Pack is some essential/compulsory items for traveling abroad.Most of us are familiar with legal requirements for driving in the UK, however when travelling abroad there are legal requirements regarding certain items that must be carried within the vehicle.British motorists are not legally obliged to carry such products when in the UK, but it may be worth consid…

Touch Of Ginger Urban Survival Range Travel Essentials Kit £4.95 …

Crown 12-in-1 Deluxe Traveller Kit (DSi XL) £8.95 …

Snakebyte DSi Travel Pack (Nintendo DS) £9.04 …

Crown 12-in-1 Deluxe Traveller Kit : Wine Red (DSi XL) £12.99 …

Wheels on the Bus Sing-Along Travel Kit [DVD] [Region 1] [US Import] [NTSC] £8.64 …

Fast Aid Essentials Travel First Aid Kit £4.95 …