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Thread: Darth Fractor's EP kit calculator

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    Default Darth Fractor's EP kit calculator



    Everyone should have seen & read the outstanding article from Gabby76:
    http://www.astronomyforum.net/astron...telescope.html

    I was goofing with the numbers to see how well my EP's compared to the kits and a little while later I'm looking at a spread sheet that will do the calculations. Just input the focal length an focal ratio of your scope and the .xls will do the rest. There are 2 tables, one for Gabrielle's 1.5 drop in mag factor and another for the 1.6.

    Check the calculations - make sure I didn't make any errors...
    There are also places to input EP focal length & AFOV to give Mag, TFOV & Exit Pupil along with a place to put in a desired Exit Pupil and get the focal length of EP that will give it to you.

    I didn't put any constraints (read reasonable limits) on the calculations therefore you can get some crazy numbers that need to be
    thrown out. One instance is with my 1250mm FL F/4.92 dob, I don't believe there are many times when a .5mm exit pupil (Gabrielle's jumping off point)
    will be practical at a mag of 508X with that 2.5mm EP

    Have fun - please feel free to use it as an excuse to buy more glass.

    EP calcs chart post.xls
    Moving on.......

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    Default Re: Darth Fractor's EP kit calculator

    I made one too.

    I have a table to list all of one's scopes. The two other tables (one for the 1.5 factor and the other for 1.6) both contain drop down lists (the blue letters) to choose a scope from the above table.

    Kind of fun to fart around on.
    Attached Files Attached Files
    Bryan

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    f/5; Celestron C6-R f/8; ES AR127 f/6.4; ES AR127 f/9.4; Stellarvue SV102T f/7; ES AR102 f/9.8;
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    ST80A f/5; Celestron Premium 80 f/11.4; Celestron C80 f/11.4; Unitron Model 142 f/16; Meade NG60 f/10
    Mounts: Celestron AVX; Bresser EXOS-2; ES Twilight I; ES Twilight II; iOptron Cube-G; AZ3/wood tripod; Vixen
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    12×60 LW, Gordon 10×50, Apogee 20×100

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    Default Re: Darth Fractor's EP kit calculator

    Quote Originally Posted by bladekeeper View Post
    I made one too.

    I have a table to list all of one's scopes. The two other tables (one for the 1.5 factor and the other for 1.6) both contain drop down lists (the blue letters) to choose a scope from the above table.

    Kind of fun to fart around on.
    Great minds Bryan..... When you going to get the 2.5mm so you can boost the 12" to 608X?
    bladekeeper likes this.
    Moving on.......

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    Default Re: Darth Fractor's EP kit calculator

    Quote Originally Posted by sketrip View Post
    Great minds Bryan..... When you going to get the 2.5mm so you can boost the 12" to 608X?
    Heck man, I'll just barlow my 4mm aspheric for 760×. It'd be like trying to hang on to a double-handful of Elmer's glue.
    sketrip and Filterxpert like this.
    Bryan

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    f/5; Celestron C6-R f/8; ES AR127 f/6.4; ES AR127 f/9.4; Stellarvue SV102T f/7; ES AR102 f/9.8;
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    MC90 f/13.3;
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    ST80A f/5; Celestron Premium 80 f/11.4; Celestron C80 f/11.4; Unitron Model 142 f/16; Meade NG60 f/10
    Mounts: Celestron AVX; Bresser EXOS-2; ES Twilight I; ES Twilight II; iOptron Cube-G; AZ3/wood tripod; Vixen
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    Eyepieces: GSO Super Plössl 40mm, 32mm, 15mm, 9mm; ES 82° Series; GSO Superview 30mm; Celestron Plössl 26mm, 20mm; ES 70° 25mm; ES Plössl 25mm; Vite Aspheric 23mm, 10mm, 4mm; Orion Expanse 20mm, 9mm; KK Ortho 18mm, 12.5mm; Bresser 70° 15mm; Coulter Optical 12.5mm; BCO 10mm; ES 62° 9mm; Zhumell Z Series 5mm
    Binoculars: Pentax PCF WP II 10×50, Bresser Corvette 10×50, Bresser Hunter 16×50 and 8×40, Garrett
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    12×60 LW, Gordon 10×50, Apogee 20×100

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    Galaxy Hunter's Creed - When you play whack-a-mole, sometimes you hit 'em on the head, sometimes you miss 'em. But its always fun to play, and if you don't play, you ain't gettin no moles! - KT4HX

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    Default Re: Darth Fractor's EP kit calculator

    Hello Steve,

    your "Steve K. E. version" looks great, so far I have checked it.
    Thanks,

    JG
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    Default Re: Darth Fractor's EP kit calculator

    You and Bryan both did nice jobs on these, but I do not have Office on my laptop so will have to continue using the pencil and paper
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2"
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    The weakest link in the optical chain is the large nut located directly behind the
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    / camera. - Gabrielle

    Ya gotta keep this Apo/
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    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind. - Jon Isaacs (CN)

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    Default Re: Darth Fractor's EP kit calculator

    Quote Originally Posted by Gabby76 View Post
    You and Bryan both did nice jobs on these, but I do not have Office on my laptop so will have to continue using the pencil and paper
    Send us the specs on the scope, we'll plug 'em in and screen shot them to you!
    Thank you for the good counsel you give us. I'm raising a Pilsner Urquell in your honor right now....
    Filterxpert and Gabby76 like this.
    Moving on.......

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    Default Re: Darth Fractor's EP kit calculator

    203mm f/9

    No forget it, Berlebach tripods first!
    sketrip likes this.
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2"
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    The weakest link in the optical chain is the large nut located directly behind the
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    / camera. - Gabrielle

    Ya gotta keep this Apo/
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    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind. - Jon Isaacs (CN)

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    Default Re: Darth Fractor's EP kit calculator

    Quote Originally Posted by Gabby76 View Post
    You and Bryan both did nice jobs on these, but I do not have Office on my laptop so will have to continue using the pencil and paper
    Hello Gabby,

    you can download Libre Office for free, I have checked it also under the Libre Office, the Excel is on my PC anyway.
    Best,

    JG
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    Default Re: Darth Fractor's EP kit calculator

    Thank you JG, that works perfectly
    j.gardavsky likes this.
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2"
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite Eyepieces: A-Z

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    The weakest link in the optical chain is the large nut located directly behind the
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    / camera. - Gabrielle

    Ya gotta keep this Apo/
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    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind. - Jon Isaacs (CN)

 

 
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