Frankenscope? Let's see it!***be advised that NOTHING in this forum has been safety tested and you are reading and using these posts at your own peril. blah, blah, blah... dont mess around with your eyesight when it comes to solar astronomy. Use appropriate filtration at all times...
For a PST mod I know it's better a F/10 refractor scope. But, I was reading about the lunt 100 specifications and I find out that is like the Explorer Scientific 102.
My question here is:
It is possible to use the ES 102 on the PST modification as well?
ES-ED102mm Essential Series Aluminum Air-Spaced Triplet Refractor
Item Number ES-ED10207-01
Optical Aperture: 102 mm
Focal Length 714mm
Focal Ratio f/7
Limiting
Magnitude 12.5
Resolution 1.14 arcsec
Tube Length
w/ Dew Shield 30.5"; 774mm
Tube Length
w/out Dew Shield 23.75"; 603mm
Diameter 119mm
Weight 9.6 lb; 4.4 kg
Thanks for all your time guys.
"I'm enough of an artist to draw freely on my imagination. Imagination is more important than knowledge. Knowledge is limited; imagination encircles the world."
--Albert Einstein, October 26, 1929
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EQ:
Double stack 60mm Coronado ( pre-meade ) H-alpha filters with a 15 blocking filter.
DMK 51AU02 the imaging source Mono CCD camera.
Orion Short 2x Barlow.
Explore Scientific 102mm f/7 Air-Spaced Triplet ED Apochromatic Refractor Telescope.
You could use the 102/714 with the PST Mod, but it would be restricted to an effective aperture of 71mm (714/10).
Alternatively you could replace the front barlow element of the PST assembly with a -140mm barlow to give the full 102mm.
Merlin66 wrote:You could use the 102/714 with the PST Mod, but it would be restricted to an effective aperture of 71mm (714/10).
Alternatively you could replace the front barlow element of the PST assembly with a -140mm barlow to give the full 102mm.
How I can replace the Barlow ?
"I'm enough of an artist to draw freely on my imagination. Imagination is more important than knowledge. Knowledge is limited; imagination encircles the world."
--Albert Einstein, October 26, 1929
------------------------------------------------------------
EQ:
Double stack 60mm Coronado ( pre-meade ) H-alpha filters with a 15 blocking filter.
DMK 51AU02 the imaging source Mono CCD camera.
Orion Short 2x Barlow.
Explore Scientific 102mm f/7 Air-Spaced Triplet ED Apochromatic Refractor Telescope.
The front barlow lens of the PST assembly can be easily removed and replaced with a 25mm -140mm barlow - if you can find one from Thorlabs/ Edmund Optics.
Merlin66 wrote:The front barlow lens of the PST assembly can be easily removed and replaced with a 25mm -140mm barlow - if you can find one from Thorlabs/ Edmund Optics.
It can't work as designed in the PST or close. Two lenses - barlow negative and a second positive (refocusing objective) works as a whole system and they
have no spherical aberration, no coma and astigmatism. If one change one lens with unknown radii, then absolutely no warranty that these aberrations will be fixed in a new system. More so, we can state, that they will not be fixed.
Better to change F/7 cone to F/10 with regular Barlow lens or with a special barlow lens. The PST etalon block better be work with it's native lens system.
Valery.
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
"I'm enough of an artist to draw freely on my imagination. Imagination is more important than knowledge. Knowledge is limited; imagination encircles the world."
--Albert Einstein, October 26, 1929
------------------------------------------------------------
EQ:
Double stack 60mm Coronado ( pre-meade ) H-alpha filters with a 15 blocking filter.
DMK 51AU02 the imaging source Mono CCD camera.
Orion Short 2x Barlow.
Explore Scientific 102mm f/7 Air-Spaced Triplet ED Apochromatic Refractor Telescope.
It's all about compromises this modding; unless you're using bespoke designed optics for a project there will always be a price to pay in terms of image quality. I modded a 70mm f6 refractor to use with a PST mod, I was pleased with the results. At the end of the day it's a way of getting a result without spending big bucks.
http://brierleyhillsolar.blogspot.co.uk/ Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!
marktownley wrote:It's all about compromises this modding; unless you're using bespoke designed optics for a project there will always be a price to pay in terms of image quality. I modded a 70mm f6 refractor to use with a PST mod, I was pleased with the results. At the end of the day it's a way of getting a result without spending big bucks.
Well, Like you say.
I do want the mod for HD pictures, and I hear you guys that my Astrotelescope 102 f/11 will do the job. But, I always was wonder if I can get the ES102ED Working for this mod as well.
Thanks you guys for your the answers.
"I'm enough of an artist to draw freely on my imagination. Imagination is more important than knowledge. Knowledge is limited; imagination encircles the world."
--Albert Einstein, October 26, 1929
------------------------------------------------------------
EQ:
Double stack 60mm Coronado ( pre-meade ) H-alpha filters with a 15 blocking filter.
DMK 51AU02 the imaging source Mono CCD camera.
Orion Short 2x Barlow.
Explore Scientific 102mm f/7 Air-Spaced Triplet ED Apochromatic Refractor Telescope.