Hi

Nice proms as I viewed, especially the first one.

Cheers. Andrew.

Hi

Nice proms as I viewed, especially the first one.

Cheers. Andrew.

Hi, Lucky to have a clear patch. EQ5 127mm triplet -150mm 35nm KG3 Omega 1.5A Blocker PST +150mm Clave' 2x Barlow Clave' 25mm Could see the Omega is a second looking down, assuming. Tried the ES 2x TE first but not good and not quiet 2x One slightly off axis reflection. Missing faint ones further of...

Hi Montana,

Diagonal in both. On EQ5.

Cheers. Andrew.

Hi A cold light breeze day today with Sun! Mak180 1800mm 35nm KG3 Omega BF CP 25mm Clave' Could see the proms in Montanas image. Mine inverted and rotated? 12.30 UT The two large ones at 8.30 for me. Under them to start with a small hedge? with bright top and a fine small jet before the two large pr...

Hi Brian,

Well I am pretty much seeing what you imaged. More wispy stuff in the images. The upside down triangle looked very similar.

As I was in testing mode I missed the smaller hedge as did not do a detailed scan round the edge.

Cheers. Andrew.

Hi James, RodAstro says my Santel Mak180 gives me an advantage over people struggling with commercial SCTs or going through many to pick out a good one. Hand made by a professional optician with no moving mirrors. Top right image here shows spot diagrams for my Mak180 https://www.telescope-optics.ne...

Hi Sunny and clear with a light wind. 11.20 UT Santel Mak180 F10 35nm KG3 1.5A Omega Blocker PST Circular Polariser Clave' 25mm 7.30 Gong Large group. Nice and crisp. Jet leaning down 70deg with little finger underneath. Jet pointing back down from the top longer jet. Pyramid opposite down jet with ...

Hi All the pictures of the inside of PSTs I have seen have the penta prism at a slight angle so seem to be made that way. To reduce reflections at the cost of some aberrations I assume. Have Meade ever made a statement about the penta prism angle? The grease over time does contaminate the surfaces. ...

Hi

Very nice.

A technical point I cannot access the animations in Firefox but they work in Bing.

Same with Stephi's? from France 'image'.

Cheers. Andrew.

Hi We had a nice sunny morning with a gentle breeze. Tried the Quark Chromo 4.2x on the 127mm Meade F7.5 Triplet with 32mm Meade SP. 11.30 UT Good details round the two spots. Could see radiating rays as in images. Swapped to Quark Prom 4.2x. Proms brighter with more contrast. The two proms near the...

Hi Surely the size of the angle of the sweet spot will not change? The collimator merely changes a converging beam with phase encoded information into a parallel beam with location encoded information and then back into a converging beam with phase encoded information at the same F No so the apparen...

Hi Mark, I appreciate that. My point is that the Mak180 at 1800mm FL is at the maximum I consider useable day to day. Just right with 25mm Clave' or 18mm equivalent little bino-viewers. So trying to use a tele-centric barlow with a Quark at a minimum doubles the FL and is not useable. At the moment ...

Hi I had a try of my Chromo Quark in a 'collimated' beam. First I had to go to a Baader T2 1.25" diagonal to reach focus with the Quark and the Clave' 25mm eyepiece, and only just or close. I could see sunspots and proms. I put a PST Collimator lens on the Quark nosepiece and the re-focus lens on th...

Hi Using the 200mm focal length and 24.5mm diameter lens with the PST etalon pushed forward to cope with back-focus issues may not be able to be moved far enough forward. You could use a shorter focal length pair say 100mm nearer to the PST etalon and you will just be using 10mm of the etalon apertu...

Hi For my 8mm collimated beam to go through the side of my Quark Prom I need a pair of -60mm and +60mm lenses. 8mm x F7.5 = 60mm. Add a 7nm second ERF to keep things cool. Laser2000 do two optosigma lenses in 20mm dia. Luckily the cheap Chinese filters I buy for use as 20mm stops with the glass remo...

Hi

Nice images as usual.

I had a few sights of the big prom whilst having a play with my kit.

At one point it looked like it was made out of lace.

Later it looked like a cock hen standing on the left looking over a hen looking left.

Cheers. Andrew.

Hi I have tried out tele-centric barlows on this before and tried my 2x ES Tele-extender and Quark Prom again and whilst it works the image scale is too large for my typical seeing. So I thought can I use my -200mm and +200mm simple lenses for the PST2 Mod2 on here with my Quarks, after getting a si...

Hi Been looking at the possibility of using a Quark in a collimated beam after seeing a HAT image with both a PST Mod and a Quark after a Tele-centric so why not the other way round? So I had a try with -150mm and +150mm simple lens set I bought to try my PST Mod2 out on the scope. I managed to set ...

Hi I saw a picture for a HAT which showed a PST Mod and a Quark after a Tele-centric. So if it works that way round will a Quark work in a collimated beam? And just to see I thought can you have 'best of both'. Yesterday I had a play setting up my 80mm F5 for tele-centric and collimation all at once...

Hi

Thanks for posting.

I have had a little experience using a prominence scope at Puimichel in France.

Cheers. Andrew.

I was playing with some scope and filter combinations and saw this as well.

Thanks. Andrew.

Hi

Do the anti-reflection coatings on the SC corrector plate also reflect UV and IR?

RodAstro says lots of telescopes are not suitable for IR imaging bcause of the modern coatings on lenses doing this.
And also far blue like CAK.

Cheers. Andrew.

Hi Just to clarify the front mounted PST collimating lens needs to be 200mm in front of the focal plane which will be about 400mm behind the back of the rear adapter plate on the SCT. So you need a low profile fucusser to allow even the low profile T2 Swiss front PST adapter to get the old position ...

Hi Thinking about it I could see more details as using a bigger scope. The little white dot for me was two little jagged streams going down from the middle spots on the right and to the right of the bottom spots of the group on the lower left. With clear space between them. And little branches off t...