SIMBOULI GIA AGORA TILESKOPIOU

[sergios]

Gia sas apo Kypro,

Tha ithela na mou grapsete kapoia sxolia, gnomes,

kritiki, sigkrisi gia to lxd55-5"refractor kai to lxd55-8"schmit newtonian. Poio apo ta dyo theoreite os kaliteri epilogi?

Efxaristo ek ton proteron,

Sergios.

[Nakis]

sergio

xoris na gnorizo polla apo ayta ta scope tha soy elega na pareis to 8" mias kai einai ena tileskopio me arket amegali diametro opote tha exeis megaliteri dinatotita sto na paratireis deep sky antikeimena (se sigkrisi panta me to 5")oposdipote to 5"tha einai kalitero stis planitikes paratiriseis stin poiotita tis eikonas kai stin astrophotographisi alla kai to8" einai ena genika kalo tileskopio gia olles tis doylies.

ayta ta oliga an kai soy eipa pos den eimai eidikos se ayta ta tileskopia.elpizo na boithisa.

FILIKA NAKIS!!!!!!!!!!!!!!!!

[RaQua]

sergio,

 

o nakis exei dikio oti 3" kanoun megali diafora idiaitera gia ta deep sky objects. Ostoso den einai ka8olou asximo oute gia planitiki paratirisi ka8ws 8a exeis safws megalutero eidwlo (apo 8ema poiotitas pisteuw oti den 8a diaferoun kai tromera) kai 8a mporeis na kaneis kaluteres paratiriseis,ennowntas oti 8a mporeis na diakrineis perissoteres leptomereies tis opoies 8a katagrafeis (px nefi Afroditis kai Ari) kai kaluteri akriveia se metriseis (px pote akrivws pernaei i kokkini kilida apo kapoion mesimvrino).

An vevaia kanw kapoio la8os please dior8wste me!

 

Greg

[petrosccd]

Xoris na ta exo dei ego tha sou proteina to 8". Giati proton i diametros einai pou metraei kai apo apopsi analysis (an milame gia optika me kali poiotita pou exei i MEADE) kai apo apopsi syllektikis ikanotitas fotos. Epeidi to S/N exei etsi kai allios poly mikri kentriki empodisi den yparxei alytheia sto na milame gia meiosi tou contrast se sxesi me to dioptriko. Etsi kai allios kai megaliteri na itan i empodisi to sxedon diplo diametrima kanei tin diafora telika!

Deuteron to dioptriko gia na exei pragmatika tin apodosi pou mporei na exei prepei na einai ekseretikis kataskeuis, opote ego tha eimoun epifilaktikos me ena sxetika ftino apoxromatiko.

Ego malista tha sou proteina na pareis to 10", afou i diafora einai molis ~300 Euro... afou kaneis tin agora pare to megalitero dynato tileskopio pou mporeis kai tha me thymitheis!

 

To mono pou tha sou epispeuso tin prosoxi einai oti eimai sigouros oti ola auta ta tileskopia exoun problima me talantoseis giati exoun tin idia basi me ta proigoumena LXD-500/300 pou eixan poly elafri alouminenio tripodi.

An alakseis to tripodi me ena ksylino, or prostheseis baros sta idi yparxonta to problima mporei na lythei... Or akoma kalytera ftikse ena monimo pylona kai bale epano tin basi an exeis auti tin euxairia.

 

Petros

[nebula]

quote:

---

Originally posted by sergios:

Gia sas apo Kypro,

Tha ithela na mou grapsete kapoia sxolia, gnomes,

kritiki, sigkrisi gia to lxd55-5"refractor kai to lxd55-8"schmit newtonian. Poio apo ta dyo theoreite os kaliteri epilogi?

Efxaristo ek ton proteron,

Sergios.

---

[nebula]

quote:

---

Originally posted by sergios:

Gia sas apo Kypro,

Tha ithela na mou grapsete kapoia sxolia, gnomes,

kritiki, sigkrisi gia to lxd55-5"refractor kai to lxd55-8"schmit newtonian. Poio apo ta dyo theoreite os kaliteri epilogi?

Efxaristo ek ton proteron,

Sergios.

---

 

Γεια σου.

Αν θα αποφασισεις για το 8" Schmid-Cassengrain

πρωσοπικη μου συμβουλη να προτιμισης της Celestron γιατι εχει καλυτερα οπτικα απο την Medae.

Χαιρετισματα απο Θεσσαλονικη.

[nefelegertis]

Simfono apolitos me tous prolalisantes oson afora

tou oti metraei to megethos kai kirios i poiotita.

Bebaia i alithia einai oti ena SCT me megali empodisi kai me to problima tis metakinisis olou tou katoptrou gia tin estiasi meionei kapos tin iperohi tis diametrou. Ostoso SCTelescopes me megali empodisi as poume tis takseos ton 12" ehoun

parashei merikes apo tis kaliteres eikones CCD planiton pagosmios. Afta apo enan latri ton dioptrikon tileskopion. Simfono omos oti hreiazetai na eisai epifilaktikos apenanti se dioptrika ta opoia einai ftina...Sigoura ego apo ena 8" Sct tha protimousa ena 8" achromatiko folded refractor alla monon o antikeimenikos kai ta defterebonta katoptra tha stoihizan kapou 3000$.Me ta idia hrimata loipon ena 12" newtonian tha itan protimotero.

[petrosccd]

Epeidi ousiastika kaneis mas den exei dei auta ta tileskopia kalo einai na psakseis sto web gia kana review... Ena poly kalo kai eksonixistiko review gia to 5" LXD55 tha breis edo:

 

http://www.cloudynights.com/reviews2/LXD55.htm

 

Ta basika themata pou episimainei einai:

 

- Kali i basi kai i odigisi gia optiki douleia(exei omos ontos problima talantoseon opos perimena)

- ta optika einai kala xoris xroma, alla oxi ekseretika kai kyrios mporei na yparxei problima euthigramisis tous fakou...

 

Episis na paratirithei oti auta ta tileskopia ouistika einai Kinezika! Sta S/N ta optika logika prepei na ginontai apo tin MEADE -o Schmidt corrector den ftiaxnetai eukola- alla ta dioptrika einai apo ta perifyma Kinezika axromatika (douleuoun alla min perimenetai kai polla pragmata), auto dikaiologei kai tin poly xamili timi...

Episis, an kai i MEADE den dinei specs gia ta S/N eida oti i basi einai 16Kg kai to 10" OTA ~40Kg! Sigoura auti i basi einai kapos mikri gia auto to tileskopio! Tha einai oti prepei gia to 6" kai kali gia to 8", alla to 10" mallon peftei megalo!

 

Basika Sergio ti se endiaferei na kaneis? Kathara optiki paratirisi? Kyrios planites, deep-sky? Or se endiaferei pio poly i astrofotografisi/CCD?

 

Petros

 

[ 07 Ιουλίου 2002: Το μήνυμα τροποποιήθηκε από: petrosccd ]

[sergios]

Agapitoi filoi,

eyxaristo gia tis simboules. Itan poly voithitikes. File petroccd vasika thelo ena tileskopio poy na exei aksioprpi apodosi se ola ta antikeimena me elaxisti klisi pros tous planites. Parepimptontws na diorthoso kapoioys apo toys filoys poy antapokrithikan oti exo na epilekso metaksi enos 5"refractor kai ena 8" schmit newtonian oxi cassegrain.

Tha ithela an gnorizei kapoios apo sas na mou pei kata poso ta s/n einai anoteris poiotitas apo ta sinithtismena newtonians. Kati anaferthika pio pano gia megalitero eidolo mporeite na mou dosete perissoteres leptomeries?

Sto leaflet tou 8"s/n anaferei oti einai paratirisimes oi skies ton doriforon pano stin epifaneia toy dia kai oti fainontai 6 doriforoi tou kronou. Aytes einai entharrintikes epidoseis gia ena tileskopio 8" kai tis timis tou?

Eyxaristo

[petrosccd]

Geia sou Sergie,

 

Dystixos tileskopio pou na kanei oles tis douleies den yparxei... O kathe sxediasmos einai kalyteros gia kapoiou eidous paratiriseis kai xeiroteros or aparadektos gia kapoies alles.

Exontas loipon ksekatharisei auto, to 8" S/N einai safos tileskopio gia deep-sky. An kai o sxediasmos einai kalyteros apo tou klasikou SCT apo apopsi anoxon, den nomizo oti to tileskopio auto exei ftiaxtei me tin planitiki paratirisi sto myalo tou sxediasti (min se ksegela to mikro stirigma tou deuteontos pou fainetai -opos ksegelastika arxika ego- prepei apo piso na einai ena megalo deutereuon opote i kentriki empodisi tha prepei na einai antistoixi me SCT ~35%)! Safos to dynato tou simeio einai mallon i fotografisi eurion pedion, alla amfybalo oti mporei na ginei me auti ti basi pou einai ftiagmeni gia optiki douleia.

To 5" apo tin alli, prepei na einai ena arketa aksioprepes axromatiko -eidika an kaneis tin euthigramisi tou fakou. Ostoso min perimeneis thaumata. Gia tin planitiki paratirisi prepei ta optika sou na einai poly kala! Sto review pou sou edosa link leei oti to eidolo arxizei na spaei pano apo 200x... Ara na perimeneis apodosi antistoixi enos 4" kalou axromatikou.

Gia tin erotisi sxetika me an to S/N einai kalytero enos Newtonian, an milame gia planitiki paratirisi opou xreiazetai kai i optiki poiotita, safos oxi... To tileskopio exei ftiaxtei poio poly san fotografiko eurion pedion -ara min anameneis kali optiki poiotita se megenthynseis pano apo 100x. Kai auto pou leei i MEADE gia to oti blepeis skies doryforon na probalontai sto Dia, auto den leei tipota... giati blepeis autes tis skies akoma kai me poly mikra (alla kala) tileskopia. Px exo dei arketes fores tetoies skies me ena 6cm axromatiko se 120x!

 

A ena page me eikones apo ta S/N einai edo:

 

http://www.lefevre.darkhorizons.org/ccdimaging/pdlccd.htm

 

Paratiriste omos oti den eginan me tin GOTO basi tou idiou tou tileskopiou, alla fortonontas to tube se Losmandy G-11...

 

Pantos auti i syzitisi fernei stin epifaneia to pragmatiko problima stin agora tilskopion kai auto pou pragmatika me enoxlei: oti eno milame gia pragmata pou prepei na exoun prodiagrafes gia na einai stoixiodos leitourgika, telika polountai san gourouni sto saki me basi kai mono tin diafimisi!

Pou leei typical kai max wavefront error gia ta tileskopia tis paragogis? Pou leei typical kai max pk-pk periodiko or tracking error?? Pou leei to poio aplo, to max baros pou pernei i basi?? Kai den to leo mono gia tin MEADE, alla gia oles autes tis megales etairies pou poulane tileskopia san an poulane paixnidia...

 

Petros

 

[ 08 Ιουλίου 2002: Το μήνυμα τροποποιήθηκε από: petrosccd ]