en:ost:fokus_new

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en:ost:fokus_new [2023/12/06 13:30] – [General remarks] rhainichen:ost:fokus_new [2025/02/06 15:01] (current) – [General remarks] rhainich
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 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: 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 − 25 − 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 50mm 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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 ^ Instrument                Adapter [mm]  ^  Position of the EFA [μm]  ^ ^ Instrument                Adapter [mm]  ^  Position of the EFA [μm]  ^
 | QHY600M                    20+10  |  16900  | | QHY600M                    20+10  |  16900  |
-| SFT-8300                  |  20+10  |  9500   |+| SFT-8300                  |  40+10  |  9500   |
 | Canon 700D                |  20+10  |  13000  | | Canon 700D                |  20+10  |  13000  |
 | Baches + QHY268M          |  10      15000  | | Baches + QHY268M          |  10      15000  |
 | Baches + QHY268M + Barlow |  20      17500  | | Baches + QHY268M + Barlow |  20      17500  |
-| DADOS + QHY268M                 |  17000  |+| DADOS + QHY268M                 |  5000   |
 | Hyperionokular: 36mm      |  80      14500  | | Hyperionokular: 36mm      |  80      14500  |
 | Hyperionokular: 22mm      |  80             | | Hyperionokular: 22mm      |  80             |
  • en/ost/fokus_new.1701869432.txt.gz
  • Last modified: 2023/12/06 13:30
  • by rhainich