Jump to content

Banner.jpg.b83b14cd4142fe10848741bb2a14c66b.jpg

Barlow Lens Information/Advice


Recommended Posts

Hi All,

I need to get a new 2x Barlow lens and looking online prices vary from a few quid to several hundred quid. While I am happy to go on a research tour of the internet, I thought I would get more mileage out of this group. :-)

My telescope is a Bresser AR-102S/600, is there anything in particular in a Barlow that I should be looking for? I am just getting into AP, but do like to just look at things every now and again.

Thanks in advance for any advice.

James

 

Link to comment
Share on other sites

I have one of these, they seem to be considered to mark the price-point where Barlows become worthwhile:

https://www.firstlightoptics.com/barlows/celestron-2x-universal-125-barlow.html

Probably cheap enough and not weep if it doesn't suit you, but I get on OK with mine.

 

Edit: extra benefits you can fit a camera t-mount adaptor to it, use it without the lens as a camera mount. One oddity is that if you need to fit a filter it has to go between the body and the lens, which slightly increases its power.

Link to comment
Share on other sites

I prefer several older, harder to find Japanese made barlows such as the Meade 140 and the Orion Deluxe.  However, the Taiwanese made GSO 2x achromatic barlow lens available in Europe here gets good reviews for its price.  It might be available in the UK as well.  It seems to be getting hard to find.  Many places have sold out of it.

Link to comment
Share on other sites

The one linked to by Stub Mandrel seems to me to be a perfectly reasonable Barlow as long as you don't need to screw a filter to the end of it and is often available on astroboot under the Skywatcher brand for £15. If you want to spend more than that then I would look at either the Antares Twist Lock Barlow for ease of use or buy a focal extender from Televue or Explore Scientific.

Link to comment
Share on other sites

The best "budget" barlow that I've used is the GSO / Revelation 2.5x:

http://www.telescopehouse.com/revelation-astro-2-5x-barlow-lens.html

I reckon it's closer to 2.2x in reality though.

The 2x GSO one mentioned above is the same item that is sold as the Celestron Omni barlow and I didn't find it more than moderately good.

If you can find a used Celestron Ultima 2x or Orion Shorty Plus 2x (both the same item and the "Plus" is significant) for under £50 then those are well worth considering because they have excellent Japanese optics. Their actual amplification is closer to 2.2x though.

 

Link to comment
Share on other sites

+1 for the budget GSO/Revelation 2.5x Barlow. I have the TS Optics version. I've got a feeling that John's right about it being more like 2.2x or 2.25x though.

TS mine.jpg

The Celestron X-Cel is very well made and a useful short Barlow. The safety undercut is shallow and isn't much of a problem extracting from anything with a compression ring. The Barlow is solidly built.

X-Cel 2x Barlowfx.jpg

This Omegon 2x 'Short Barlow' (below) is the nearest in quality to my TeleVue Barlows to look through. Its build quality is also quite good and has a filter thread. It is originally made by Barsta (BST) and reputedly the apochromatic glass element is Japanese. TS Optics and others distribute the same Barlow but often cheaper than Omegon (if only I'd known at the time lol).

Omegon Barsta.jpg

Link to comment
Share on other sites

On 18/08/2016 at 15:10, Mak the Night said:

+1 for the budget GSO/Revelation 2.5x Barlow. I have the TS Optics version. I've got a feeling that John's right about it being more like 2.2x or 2.25x though.

TS mine.jpg

The Celestron X-Cel is very well made and a useful short Barlow. The safety undercut is shallow and isn't much of a problem extracting from anything with a compression ring. The Barlow is solidly built.

X-Cel 2x Barlowfx.jpg

This Omegon 2x 'Short Barlow' (below) is the nearest in quality to my TeleVue Barlows to look through. Its build quality is also quite good and has a filter thread. It is originally made by Barsta (BST) and reputedly the apochromatic glass element is Japanese. TS Optics and others distribute the same Barlow but often cheaper than Omegon (if only I'd known at the time lol). Is this the same one please https://www.amazon.co.uk/TS-Optics-Achromatic-Barlow-Multi-Coated-TSB21/dp/B004ORS5W0

Omegon Barsta.jpg

 

Link to comment
Share on other sites

53 minutes ago, wookie1965 said:

Yes, I'm convinced it's the same Barsta (BST) 2x apochromatic short Barlow. They're quite high quality 'shorties' IMO.

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.