Hi Graphed out the PST, assuming 18mm clear aperture AKA Daystar and 2mm round 10mm Sun for prominences. The Moon filter front which turned up from somewhere at 16mm was exactly right to go after Bobs Comb Filter so explains why it nicely darkened the field. Need my two Chinese cheap Moon filter bod...

Hi With the moved forward primary to reach focus even with the PST Collimating lens moved forward will result in some primary vignetting. The best case is for the Lunt 110mm DERF to be in a 100mm diameter aperture cell. Using Mel Bertles Newtonian secondary field illuminator calculator: Mirror 100mm...

Hi First time copied the first picture a few times, and perhaps twice the second or one 'in the system'. Had two days out in the sun with the PST 'Combat' etalon. Followed by the Re-focusing lens in a Celestron Moon filter in a BF 48mm to 28.5mm adapter infront of a diagonal. The diagonal contains o...

Hi

The first picture is duplicated somehow but they are all there with the captions displaced underneath.

Andrew

Hi I am confused by the image inclusion here. The baffle over the secondary: P1050426.JPG The baffle from the front. P1050427.JPG The baffle refitted with Sika sealant. P1050433.JPG A baffle for the primary baffle made out of a cheap Barlow nosepiece from Rods bits box. P1050438.JPG Mounted as far f...

Hi Well theory and practice may not differ so much. Many people run Telecentric Daystars at F16 to F20 for seeing when F30 is optimum for the telecentric. How did you measure the temperature? A thermometer in the beam? The Baader will reflect most of the energy outside of its 35nm passband, and let ...

Hi

If its a cheap scope you cut cut ventilating holes in the tube above the internal DERF.

With some shading baffle over for skylight.

Andrew.

Hi, Does the PST with the original black box on the back reach focus on the C8? If so how far is the eyepiece field stop back from the C8? The optimum back focus on the C8 for no spherical abberation is 5" 127mm. The PST Collimator needs to be 200mm inside the original telescopes focus to collimate ...

Hi Some pictures of the mod. The baffle over the secondary: P1050426.JPG It seems to repeat this image even though the attachment names are different. I used Cut and Pase which gave me a little box underneath where I said paste inline where I was. ??? As you can see the edges of the correction lense...

Hi Mark,

Can I post photo here of kit few MB ro do I need to load into a photo site?

Andrew

Hi Had a session though windy and almost no proms so nothing to see really. When AstroRod borrowed my laser pointed remote thermometer his highest reading from the 6" Zeiss with internal ERFs was 24C looking into the eyepiece. He bought a UV meter and that showed lower readings up the eyepiece than ...

Hi I have moved the PST Collimator lenses out of the Etalon. I have put a tilted Omega Bobs 40nm ERF in place of the Collimator lens. This works up tp 127mm in my experience, though I have a tilted 2" Baader 35nm futher up the focusser with a 48 mm to 43mm step down ring as a baffle in front. And I ...

Hi Tried the Omega Bobs 1.5A filter as a replacement Comb Blocker. I first tried on the Vixen VMC110 and with the filter well tilted to get its features out of field I got the proms with the PST tuner further round than normal. Had to move to a prtable mount the get a glimpse in the 127mm over a tre...

Hi

More playing about the Revelation extension tube does screw into the AOK Swiss PST front adapter, the Black2 paint making it tight.

Andrew.

Hi I have been trying to mount the PST Etalon in a 2" focusser, with the Collimator lens in a 1.25" barlow nosepiece suspended inside and a 2" extension on the front for a possible 2" ERF or just an extra baffle for the Sun cone. Photos to come. The Revelation 2" extension threads onto a Guan Sheng ...

Hi

Baader use a different thread on their 2" extension tubes to Revelation ones.

Revelation M48 to T2 seem OK to me.

I am thinking of using T2 instead for a DS as it seems to be more 'standard'.

Andrew.

Hi Mark,

I forgot about the difference in the etalons.

Andrew.

Hi If you are getting a coloured glass ERF it will absorb 66% of the visible light, if its UV-IR coated. A 2" Baader 35nm will only absorb 6%? of the light and reflect the rest. And pass only 10% of the visible as opposed to 33%. Astrograph sells 6" refractors with a Baader 35nm as the ERF. If you a...

Hi My link was from a couple of years ago! Remember the Comb Filter is at an angle which you want to keep if you drill it out. To throw reflections off axis, which you can see if you took the PST Black Box plate off. Also the pentaprism is set at an angle for the same reason. All the photos of an or...

Hi You can buy the Comb Blocking filters Daystar use from Andover: FeroT wrote: ? Tue Feb 21, 2017 6:07 pm Andover makes the BF for Daystar Quark (656FS02-12.5), it is 12.5mm diameter and cost $157 for one piece. I have replaced it with a 25mm diameter one (656FS02-25) and use it with TV 4xPowerMate...

Hi I am still in modding mode. Mainly baffling out stray light as I like good contrast. I have a little QYH but failed to find focus in one try on the PST some time ago. I might try sketching. As the Sun is dynamic its just nice looking. My one bodge try on the 127mm at F30 what I could see was comp...

Hi I was doing a first test of a 90mm F6.7 with a 4x Barlow and a straight through PST Etalon on the 25th late morning in the UK. I could see a region, sort of hedge prominence, on the bottom right for me, about twice the height of the spiricules. Does that sound about right based on images taken? A...

Hi I tried spacing the black box further back with T2 extension tubes but outside of focus range then. So I must be near to the 200mm backfocus requirement. I have put a 20mm washer in the back of the main baffle tube to see if makes any difference to incoming off-axis sunlight glare or reflections ...

Hi 1. Stage 1 PST Mod. Used the same set up as on the 127mm with 2x ED Barlow un-screwed nosepiece before the Etalon, AOK Swiss T2 low profile adapter and T2 to 48mm. And a Baader 2" UV-IR on 4 2" Extension tubes in front. With 48-43mm step down ring as a baffle for the front of the focusser tube on...

Hi The AR90 looks a good choice as available new. I never came across it when looking for a OTA. I would first use it with the 2" UV-IR placed up the tube where its just under fully illuminated. The dielectric filters only absorb a bit of energy in the coating. For the space telescope I used for an ...