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Lacerta 2" Herschel Wedge


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Lacerta Brewster-angle 2" Herschel Wedge - First Light My new Herschel wedge arrived the other day and got it set-up with my Orion 120mm f/5 frac. Impressed with the sheer quality of the wed

Like Stu and John, I've frequently used my 1.25" Lunt with my ED120  and whilst the red spot on the back gets hot, that's what it's supposed to do. I got the 2" Lacerta because I was worried abou

Cheers both, you really don't realise how glad I am you've both said that.  1.25" It is 😀😀😀😀.  Thank you 👌👍

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When I had the chance to use the 1.25" Lacerta it was on a 220mm refractor. It did have an ERF fitted but it was a transmission rather than reflection type so the heat attenuation was not a great amount.   :sad:

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Stunning refractor John if ever there was one !!! ?

 

Peter I think using a 1.25 wedge on a 220mm refractor with a (daystar erf ?) is nuts ... but I'm sure did break a 1.25 aperture record !!!!

 

Brian 

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I'm expecting mine to be delivered tomorrow and am looking forward to first light.

@Solar B I hope that the viewing angle doesn't prove to be an issue, but I do have a Skytee II and pier extension to get some extra height if needed.

Ade

Edited by AdeKing
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  • 2 years later...

I know this is an older thread but still might be useful. 

I've been looking at this Lacerta Wedge for quite a while and I'm stuck between the 1.25" And 2" Version. 

I'll be using a Celestron Omni XLT 120 with 1000mm focal length. It accepts both 1.25 and 2".

Most of my eyepiece are 1.25".

Now I see it's recommended to go with the 2" For this size aperture. 

Would the 1.25" Version be ok with my scope regards any heating issues etc? 

I suppose I have the option to keep the main lens cap on the scope but removing the smaller central cap which would make the aperture smaller in a way, but I'd rather use the full aperture if I'm honest. 

What are your thoughts please? I'm not wanting to go and buy 2" Eyepieces and contrast filters if I can help it. 

 

Edited by Portech7
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I have the Skywatcher Evostar 120 which is essentially the same as your Omni 120. I successfully used a 1.25" Lunt wedge with no over heating issues, even on long sessions. The wedge gets warm but not so warm as to be a problem. I switched to the Lacerta about 12 months ago and haven't looked back. Not entirely sure it is measurably better than the Lunt in terms of what I can see or image but it has given me some spectacular views and that's enough to convince me.

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6 minutes ago, Portech7 said:

I know this is an older thread but still might be useful. 

I've been looking at this Lacerta Wedge for quite a while and I'm stuck between the 1.25" And 2" Version. 

I'll be using a Celestron Omni XLT 120 with 1000mm focal length. It accepts both 1.25 and 2".

Most of my eyepiece are 1.25".

Now I see it's recommended to go with the 2" For this size aperture. 

Would the 1.25" Version be ok with my scope regards any heating issues etc? 

I suppose I have the option to keep the main lens cap on the scope but removing the smaller central cap which would make the aperture smaller in a way, but I'd rather use the full aperture if I'm honest. 

What are your thoughts please? I'm not wanting to go and buy 2" Eyepieces and contrast filters if I can help it. 

 

I know the manufacturer advice is often to stick to 100mm aperture but in my experience of a Lunt 1.25” it works perfectly well in a 120mm (120ED in my case) and probably bigger still. The heat sink may get hot on a hot midsummer day, but it is designed to do just that.

You don’t really need 2” eyepieces for solar, a 24mm 68 degree eyepiece will fit the sun in several times over, you are normally using higher powers so 1.25” are fine.

Plenty of chat about it here:

 

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2 hours ago, John said:

I've used my Lunt 1.25" Herschel Wedge quite often with my ED120mm refractor and the combination works well and safely.

 

2 hours ago, Stu said:

I know the manufacturer advice is often to stick to 100mm aperture but in my experience of a Lunt 1.25” it works perfectly well in a 120mm (120ED in my case) and probably bigger still. The heat sink may get hot on a hot midsummer day, but it is designed to do just that.

You don’t really need 2” eyepieces for solar, a 24mm 68 degree eyepiece will fit the sun in several times over, you are normally using higher powers so 1.25” are fine.

Plenty of chat about it here:

 

Like Stu and John, I've frequently used my 1.25" Lunt with my ED120  and whilst the red spot on the back gets hot, that's what it's supposed to do.

I got the 2" Lacerta because I was worried about using a larger Frac but I needn't have worried the 1.25" has seen me ok.

Ade

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Recently got the 2 inch version, it reaches focus with my Skywatcher 120 Pro ED but not enough in focus on my ST120. We're in for trash weather for a while so I'm going to chop an inch off the ST120. I have extenders for other than solar use but to be honest that scope will probably be dedicated to solar.

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I had the same issue fitting a Baader Cool 2” wedge to the Genesis OTA.

The clip lock feature added to the back focus needs.

I had to remove the clip lock and use a SCT adaptor to get focus.

 

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  • 6 months later...

@johninderby I'm resurrecting this thread because I'm thinking about getting the 2" version.  You mention that you direct attached the 2" to 1.25" adapter to the rotation adapter via the thread.  Which adapter are you using?  Thanks!

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Long story but sold the wedge a while ago but ended up getting another one as in this neew thread.

The wedge now comes with a rotation adaptor with a T2 thread so fitted a T2 to 1.25” eyepiece adaptor. Thread shows a 15mm high adaptor with a T2 spacer on the top but you could use a taller T2 to eyepiece adaptor if ypu wanted. One thing  to be aware off is that the wedge requires a lot of inward focus travel on the scope so this will effect how tall an adaptor ypu can use. 

 

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Thanks, I was wondering if the rotator's top thread was T2 because I couldn't find anything about it on Lacerta's site.

Also, I totally missed your newer thread.  Thanks for the pointer.

Edited by Louis D
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