en:ost:fokus_new

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en:ost:fokus_new [2021/02/28 20:59] – [General remarks] rhainichen:ost:fokus_new [2023/12/06 13:30] (current) – [General remarks] rhainich
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 ++++ Calculation of the ideal adapter | ++++ Calculation of the ideal adapter |
-The back focus of the telescope is 147 mm (behind the EFA). The eyepiece clamp used has a back focus of 12.5 mm. The length of the ideal adapter ''D'' is therefore calculated as follows:+The back focus of the telescope is 147 mm (behind the EFA). The Zeiss quick changer used has a back focus of 25 mm. The length of the ideal adapter ''D'' is therefore calculated as follows:
  
    D = 147 − 12,5 − 33/2 - C,    D = 147 − 12,5 − 33/2 - C,
  
-where ''C'' is the backfocus of the respective instrument. The STF-8300 together with all attachments has a backfocus of 57.5 mm. Therefore, the ideal adapter for the STF-8300 is 60mm long.+where ''C'' is the backfocus of the respective instrument. The STF-8300 together with all attachments has a backfocus of 57.5 mm. Therefore, the ideal adapter for the STF-8300 is 50mm long.
 ++++ ++++
  
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 /*|< 100% 33% 33% - >|*/ /*|< 100% 33% 33% - >|*/
 ^ Instrument               ^  Adapter [mm]  ^  Position of the EFA [μm]  ^ ^ Instrument               ^  Adapter [mm]  ^  Position of the EFA [μm]  ^
-| QHY600M                  |  20+10  |  11300  | +| QHY600M                   |  20+10  |  16900  | 
-| SFT-8300                 |  40+10  |  9500   | +| SFT-8300                  |  20+10  |  9500   | 
-| Canon 700D               |  40+10  |  13000  | +| Canon 700D                |  20+10  |  13000  | 
-| Baches + ST8             |  40+10  |  20200  | +| Baches + QHY268M          |  10     |  15000  | 
-| Hyperionokular: 36mm     |  100    |  14500  | +| Baches + QHY268M + Barlow |  20     |  17500  | 
-| Hyperionokular: 22mm     |  100    |         | +| DADOS + QHY268M           |   0     |  17000  | 
-| Hyperionokular: 13mm     |  100    |  25200  | +| Hyperionokular: 36mm      |  80     |  14500  | 
-| Canon + Superzoom        |  100    |  19550  |+| Hyperionokular: 22mm      |  80     |         | 
 +| Hyperionokular: 13mm      |  80     |  25200  | 
 +| Canon + Superzoom         |  80     |  19550  |
  
 ==== Manually ==== ==== Manually ====
  • en/ost/fokus_new.1614545953.txt.gz
  • Last modified: 2021/02/28 20:59
  • by rhainich