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Which 2" Diagonal - Advice


Pig
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Hiya,

I want to get a 2" diagonal to suit my scope and I don't really want to spend more than £120

Is it worth getting one if I only have 1.25" eyepieces ?

If so I would appreciate advice on what you feel is the best make to get ?

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Only if you intend upgrading to 2" eyepices. diagonals are much of a muchness performance wise no matter what the adverts say. Yes some are built better but most dielectrics give about 99% so how about this one http://www.teleskop-express.de/shop/product_info.php/info/p84_TS-SC-2--Star-Diagonal---99----Compression-Ring---SCT-Thread.html

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Looks like Rowan46 has made a good recommendation there. Has a very high surface accuracy and has a dielectric coating for 99% reflectivity across the visible spectrum. And it allows you to retain the option for 2" EPs in the future.

EDIT: Lambda is a measure of the surface accuracy in terms of a wavelength of light. In this case 1/12 lambda is very good.

Edited by DirkSteele
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Also an excellent choice. I use one with my APM 105 triplet refractor. It is my travelscope so I keep the weight to a minimum and that one is a touch lighter than many of the competing products. The Televue diagonal for example weighs a far amount, but it was machined from a single block of aluminium so understandable. But it is also about £250.

EDIT: Turns out it is now £270. I own one which I use with my TMB 115. I just held both in my hands and there is quite a noticeable difference in the weight,

Edited by DirkSteele
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I have 2" dielectric diagonals by William Optics, Tele Vue and Revelation. They vary in build quality from superb (Tele Vue) to pretty good (Revelation) and their prices new vary from £250 (Tele Vue) to £98 (Revelation). They all have compression ring fittings on both the 2" and 1.25" apertures. In terms of optical performance I really can't tell them apart at all :rolleyes2:

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So they get quite expensive then :shocked: Quite heavy too. I do like the look of the carbon fiber :smiley:

The carbon fibre bits are just decorative side panels. The rest of the WO diagonal is made from alloy.

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I have 2" dielectric diagonals by William Optics, Tele Vue and Revelation. They vary in build quality from superb (Tele Vue) to pretty good (Revelation) and their prices new vary from £250 (Tele Vue) to £98 (Revelation). They all have compression ring fittings on both the 2" and 1.25" apertures. In terms of optical performance I really can't tell them apart at all :rolleyes2:

LOL well I might as well get one for a £5er :grin:

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The carbon fibre bits are just decorative side panels. The rest of the WO diagonal is made from alloy.

The description reads like it is has a carbon fiber body- sneaky or what :shocked:

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LOL well I might as well get one for a £5er :grin:

If the £5 one has that same spec then, yes :smiley:

More realistically I've seen good Dielectric diagonals go secondhand for around £50 reasonably frequently.

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I've got the standard skywatcher, revelation and a WO carbon sided. Have to say the standard one is pants and the WO is the one I pick up every time. The difference between them is very noticeable for me :)

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I've got the standard skywatcher, revelation and a WO carbon sided. Have to say the standard one is pants and the WO is the one I pick up every time. The difference between them is very noticeable for me :)

That's interesting, The WO does seem to get a lot of good reviews, is the one yu have the same one as in my link above ? :smiley:

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I have the Teleskop Service one and I think it's brilliant for under a £100

Imad can you post the a link to it please, do you get a 1.25" adaptor included ? :smiley:

Edited by Pig
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Imad can you post the a link to it please, do you get a 1.25" adaptor included ? :smiley:

I think that's the link i put up and yes it does come with an adaptor Edited by rowan46
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Thank you, it does appear a flick of the coin between the two of them :smiley:

Frankly, I didnt seeuch difference between the 99% reflectivity and the 91% one which is almost half the price. I use both interchangeably :)

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Frankly, I didnt seeuch difference between the 99% reflectivity and the 91% one which is almost half the price. I use both interchangeably :)

How do they compare to the one that came with the scope ?

Edited by Pig
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