Solar B

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 

Not nearly as cool looking as the chic Baader ?but a very interesting piece of kit ... viewing angle could be an issue

for some though.

Brian 

These quads offer much more though .... it's hard to discribe but they do offer up colours (not false) that are just not discernible 

with other EDs & triplets .... they are FS killers (did I really say that ?) and with only about 12 or 15 ever made have 

real legendary status imho.

Brian 

No not i Chris .... an amazing scope though and a most fortunate new owner plus I'm sure your wondering how it could be much better than say an FPL53 but it was as I owned/was using an equinox at that time and place !

Brian 

Gone !! ... I had the pleasure of looking through one of these some years back and can honestly say that the views

were extraordinary ... the likes of which I'm unlikely to forget ... it had also been sorted by Es

Brian 

Mmmm not seen that before on the etalon window .... will check mine .... hope you can get it all resolved.

Brian 

From memory if you look to the night sky with pure CaF2 (fluorite) optics everything suddenly becomes a dark velvet black !

Objects then stand out ... colours and structures can be seen that were previously invisible  , a modern equivalent could 

be using an OLED v an LED TV (whoops wrong forum ?)

Brian 

Outstanding & Congrats on the acquisition ... just the best that is all ?

Brian 

That 90 Degree erecting prism is tres expensive but what I've considered recently is ....

In the HIFI world the correct chain of importance is 

1. Source .... CD player or Turntable 

2. Amplifier 

3. Speakers 

So it stands that in the Astronomy world the correct chain of importance would be

1. Telescope / Optics

2. Diagonal

3. Eyepiece 

Now many will happily spend hundreds on an EP but only around £100 on a diagonal 

I suggest that this may be an error as the diagonal in the chain is actually more important than the EP

Brian 

Mr M Ludes had suggested a couple of years ago that it Would be possible to make a single 0.5A filter with reference to Mr A Lunt,

so naturally it is possible to make low bandwidth filters but at

a cost.

I have owned and tried numerous PSTs but i feel that the differences in contrast some exhibited had as much to do with the

light path as their etalons EG old V new design and other

small permutations in manufacture such as coatings.

PS there is only one person that i would go to,to guarantee a filters bandwidth and we both know who that is.

Well im glad your happy with your Mod Peter and that certainly is a stretch 145mm into a 22mm etalon

I think you would find that Proms are better viewed nearer 1.0A though.Some suggest their PST etalons are around 0.7A which would be an outstanding performance from a 300 quid etalon,i think in reality they may not be.

Talking about squeezing aperture from small etalons the LS152 only uses a 60mm etalon.

Brian

In all honesty the LS35 should walk all over a PST,due to the fact it uses a 35mm "front" mount etalon (same one that is "rear" mounted in the LS60) so employs a much larger clear aperture etalon than the also "rear" mounted PST etalon which is 20-22mm i think .

I think the stage 2, PST mods are very good but only really from

an imaging perspective as you are constrained to the PST etalons

bandwidth and size so no matter how large your aperture is, say 200mm it will only ever be a 200mm PST,would like a look through one that large though .

Brian

A very good and Honest review indeed,for me its a case of Lunt does it again im afraid,making wild bandwidth claims about their

instruments that cannot be substantiated.

Brian