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Explore Scientific HR Coma Corrector

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11 replies to this topic

#1
russ.will

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Can anybody shed any light on the ES Coma Corrector? It's appeared in the listtings of Robotics.nl and Bresser.de for 299 Euro. Beyond that, I've seen mention of it being photo/visual and having appeared at NEAF, but little else.

Naturally, one is hoping for a Parracor on the cheap, which isn't improbable, based on ES track record. On the other hand, recent history has shown that ES is starting to innovate it's own solutions, so maybe it could be interesting in it's own right. A further leap, suggests the likely $299 US price would land one in the UK for £260 odd inc import taxes. More than the £85 I was planning on dropping on the GSO Coma Corrector, but if it's just around the corner, it seems sensible to wait and see, no?

Russell

ES Ultra Light 305mm Dob & ED80 Apo Triplet : Bresser Messier AR127L & EXOS2 Goto

Nagler 3-6mm zoom : Delos 8, 12 & 17.3mm : Maxvision SWA 20, 24, 28, 34 & 40mm : ES 2x Focal Extender
Williams Optics 8x50 RA Finder : Lunt 1.25" Herschel Wedge.


#2
cs1cjc

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I understand that ES have no immediate plans to bring this to market (see this thread: http://www.cloudynig...03/Main/5596470). I can recommend Roger Ceragioli designed GSO coma corrector which does not need a turntable for a reasonable choice of eyepieces, see http://www.teleskop-...-Anschluss.html or http://agenaastro.co...-corrector.html (currently no UK source that I know of). For higher power there is the APM coma correcting barlow, see http://www.apm-teles...oma-barlow.html

Edited by cs1cjc, 15 February 2013 - 08:05 AM.

Chris C

OO UK 350 f/4.6 Dob, OO UK 200 f/4.5 on GP2, Equinox 120 on AOK AYO, IKI 70ED on Porta Mini

#3
Moonshane

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that GSO corrector looks very good Chris, especially for €55. does is screw to the eyepiece? presumably you could also add it to e.g. http://www.teleskop-...-2--female.html and then use different eyepieces in it?

Don't think, feel! It is like a finger pointing a way to the moon.

Don't concentrate on the finger or you will miss all that heavenly glory. Do you understand?

(Bruce Lee in Enter the Dragon)

It applies to eyepieces too

 

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#4
cs1cjc

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TS sell the the corrector without a bundled adaptor, but the part you indicate should be fine. The corrector will indeed screw on to a 2" filter thread to correct an eyepiece. Correct spacing (75mm +/-10mm) can be achieved Hyperion fine tuning rings and/or empty 2" filters. One correspondent only uses it with his Ethos eyepieces and leaves the right spacing on each eyepiece so only the corrector needs to be moved. It is more convenient I think to use the corrector with a visual 2" adaptor. I wrote a guide to using this coma corrector here: http://stargazerslou...and-user-guide/


PS There is also the Baader MkIII to wait for, if you like waiting...
  • russ.will likes this
Chris C

OO UK 350 f/4.6 Dob, OO UK 200 f/4.5 on GP2, Equinox 120 on AOK AYO, IKI 70ED on Porta Mini

#5
Moonshane

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cheers Chris
sounds like a decent solution at not a lot of cost. I actually have a tunable Type 1 Paracorr (used in my 16" f4) which I got used for £165 so you can sometimes find them, but I recently bought a 12" f4 OTA (to convert to a dob soon) and it would be nice to have a coma corrector for that too at lower cost. Something else for my list I think!

Don't think, feel! It is like a finger pointing a way to the moon.

Don't concentrate on the finger or you will miss all that heavenly glory. Do you understand?

(Bruce Lee in Enter the Dragon)

It applies to eyepieces too

 

Messier 94/110 NGC 186/7836 Caldwell 23/109 Herschel 91/400 (non NGC) IC 1/179 Collinder 93/471 Stock 3/24 Melotte 32/245 Trumpler 1/37 Best 700 183/700 Cambridge showcase double stars 42/111 (123) (133) Lunar 66/100 Comets 7 Planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune


#6
russ.will

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I understand that ES have no immediate plans to bring this to market (see this thread: http://www.cloudynig...03/Main/5596470). I can recommend Roger Ceragioli designed GSO coma corrector which does not need a turntable for a reasonable choice of eyepieces, see http://www.teleskop-...-Anschluss.html or http://agenaastro.co...-corrector.html (currently no UK source that I know of). For higher power there is the APM coma correcting barlow, see http://www.apm-teles...oma-barlow.html

i believe the Altair Astro unit is the GSO photo/visual CC complete:

http://www.altairast...productid=16363

This is the one I was intending to buy, simply because there's no cost advantage in importing the GSO from America.

Russell

ES Ultra Light 305mm Dob & ED80 Apo Triplet : Bresser Messier AR127L & EXOS2 Goto

Nagler 3-6mm zoom : Delos 8, 12 & 17.3mm : Maxvision SWA 20, 24, 28, 34 & 40mm : ES 2x Focal Extender
Williams Optics 8x50 RA Finder : Lunt 1.25" Herschel Wedge.


#7
cs1cjc

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i believe the Altair Astro unit is the GSO photo/visual CC complete:

http://www.altairast...productid=16363

This is the one I was intending to buy, simply because there's no cost advantage in importing the GSO from America.

Russell


Yes it is. Mine is branded Altair Astro but they have not been available for some time. I am glad they are back in stock in the UK!
Chris C

OO UK 350 f/4.6 Dob, OO UK 200 f/4.5 on GP2, Equinox 120 on AOK AYO, IKI 70ED on Porta Mini

#8
russ.will

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Indeed. I'd forgotten when I clicked the 'Notify when in stock' button, it seems so long ago.

The notification came through a few days ago and then I saw the ES CC start cropping up on sites with a price, if not pictures.

I'll ping a few emails tonight, just to make sure about the ES. When the cheque for my latest articles clears, I'll probably just buy the AA/GSO as the ES has the smell of vapourwear!

Cheers,

Russell

ES Ultra Light 305mm Dob & ED80 Apo Triplet : Bresser Messier AR127L & EXOS2 Goto

Nagler 3-6mm zoom : Delos 8, 12 & 17.3mm : Maxvision SWA 20, 24, 28, 34 & 40mm : ES 2x Focal Extender
Williams Optics 8x50 RA Finder : Lunt 1.25" Herschel Wedge.


#9
russ.will

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GSO Coma Corrector purchased and according to DHL, it's on it's way. On the downside, it's DHL, so on it's way where and when, is anybodies guess...

No matter, the forecast for the weekend is snow and more snow, so it'll doubtless suffer the same fate as my 2 week old and unused ES Focal Extender. :(

Thanks for the input all the same chaps. :)

Russell

ES Ultra Light 305mm Dob & ED80 Apo Triplet : Bresser Messier AR127L & EXOS2 Goto

Nagler 3-6mm zoom : Delos 8, 12 & 17.3mm : Maxvision SWA 20, 24, 28, 34 & 40mm : ES 2x Focal Extender
Williams Optics 8x50 RA Finder : Lunt 1.25" Herschel Wedge.


#10
rowan46

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GSO Coma Corrector purchased and according to DHL, it's on it's way. On the downside, it's DHL, so on it's way where and when, is anybodies guess...

No matter, the forecast for the weekend is snow and more snow, so it'll doubtless suffer the same fate as my 2 week old and unused ES Focal Extender. :(

Thanks for the input all the same chaps. :)

Russell

I would be interested in reading a review of the focal extenders performance

TS 80/480 triplet, Technosky eLLe alt /az mount
maxvision 24 sw, delos 12, pentax xw 7, pentax xw 5 

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#11
russ.will

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Blimey! That was quick. :)ImageUploadedByTapatalk1361539075.115180.jpg

ES Ultra Light 305mm Dob & ED80 Apo Triplet : Bresser Messier AR127L & EXOS2 Goto

Nagler 3-6mm zoom : Delos 8, 12 & 17.3mm : Maxvision SWA 20, 24, 28, 34 & 40mm : ES 2x Focal Extender
Williams Optics 8x50 RA Finder : Lunt 1.25" Herschel Wedge.


#12
russ.will

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I would be interested in reading a review of the focal extenders performance

Chris has already done a far more comprehensive review (of the same item with GSO carved in it's metal) than I could, but I'll certainly be happy to add my voice to the chorus. :)

Russell

ES Ultra Light 305mm Dob & ED80 Apo Triplet : Bresser Messier AR127L & EXOS2 Goto

Nagler 3-6mm zoom : Delos 8, 12 & 17.3mm : Maxvision SWA 20, 24, 28, 34 & 40mm : ES 2x Focal Extender
Williams Optics 8x50 RA Finder : Lunt 1.25" Herschel Wedge.





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