Using Barlow lenses with your telescope (A buyer's guide)

Using Barlow lenses with your telescope (A buyer's guide)

Available from: http://www.scopesnskies.com/

Presented by Robert J Dalby

Produced by The Astronomy and Nature Centre in association with A.R.B Media Productions.

Category:

Science & Technology

Tags:

• Barlow
• Lenses
• Scopesnskies
• Scope
• Skies
• Pulsar
• Optical
• Astro
• Engineering
• Astronomy
• Stars
• Planets
• Observatory
• Observatories
• Sun
• Moon
• Mercury
• Venus
• Earth
• Mars
• Jupiter
• Saturn
• Uranus
• Neptune
• Pluto
• Galaxy
• Solar
• System
• Telescope
• Constellations
• Nature
• Centre
• Robert
• Dalby
• Pier
• Mount
• EQ
• Astrophotography
• Night
• Astroboot
• Binoculars
• Spotting
• Bird
• Watching
• Plane
• Ship
• Long
• Distance
• How
• To
• Tutorial
• Help
• Viewing
• Guide
• Sky-Watcher
• Meade
• Bresser
• Celestron
• Vanguard
• Helios
• Barr
• Stroud
• Adler

[DonPipeFelipe]

Hi there,

What are the specifications for the webcam used in this instructional video?

Thanks

[AstronomyAndNatureTV]

@DonPipeFelipe The one in the vid is just an old banger we had lying around but the one we would recommend (we don't sell it I'm afraid) is the Philips SPC880 with a flash update to the SPC900NC specification. We do sell the best nose-pieces and filters for it however. Just Google SPC880 and click away! Hope this helps. KR A&NC

[paulkazjack]

Does adding a x2 Barlow to your scope reduce the image brightness?So a x4 Barlow would produce a 'closer' image at the sacrifice of image brightness...?cheers.

[AstronomyAndNatureTV]

@paulkazjack Hi there, thanks for watching! The nett amount of light arriving at the eye-end of your telescope is determined by the instruments aperture. However the 'apparent' brightness of the image in a particular eyepiece is influenced by a number of factors, some small, some larger in impact. The actual size of the image presented to the eye is an example: with a fixed amount of light entering the scope - spreading this light over a wider area it will appear dimmer to the eye. KR A&NC

[heavenlyhighlights]

I have just bought a Dobsonian 10 goto and am having trouble viewing anything with the barlow 2x lens. I am unable to focu. the object such as Jupiter is is terrribly out of focus. Can anyone please tell me how to make this work? Any advise would be welcomed. Thank you

[AstronomyAndNatureTV]

@heavenlyhighlights Hi there, thanks for watching! Generally the accessories supplied with telescopes are not always a good match for the main instrument. Look to upgrade these basic 'bundled-in' accessories as soon as you can. The good news is the upgrade path need not be expensive. Take a look at our vids on the topic of upgrading eyepieces. Hope this helps. A&NC

[kubr1ck36]

Learned a lot from your vid.!! Thanks a bunch.!!

[Andyle70]

Thanks for the video



[DHLaShomb]

Great video....do you suggest powermates as well?

[lordphilip]

@AstronomyAndNatureTV .........I want to buy the current AC555 furnished with a female filter thread on the front. I live in USA and I am a new friend of Thierry Legault and Emmanuel Rietsch....I was on your website and cant find a way to order this current AC555 from you. My name is Philip I want to order from you if you do not have a dealer in USA. Thanks

[AstronomyAndNatureTV]

@lordphilip Hi there, thanks for watching! Yes the current AC555 is furnished with a female filter thread on the front. Older versions lack this feature. Of course you can always add a filter at the rear (ie put the filter on the eyepiece before fitting the MagniMax) and this will increase the amplification effect - the more filters, the greater the amplification. This can be a useful feature of this type of image amplifier. Regards A&NC