The Leo Triplet (NGC3628,M65,M66)
It was the first time in a month that the sky was still humid and PM2.5-filled, but I aimed my telescope at the Triplet Galaxy in Leo.
I planned to expose for 3 hours, but the humidity was increasing, so I finished in just under 2 hours.
I couldn't see the tail of the hamburger at all. So it was a failure.
I always notice this, but with the angle of view centered on these Triplets, there are few guide stars. Moreover, it took me about an hour to adjust the guide stars with my current OAG.
To be honest, guiding with the Doublet APO and OAG can only be used for shooting with a short focal length.
All the off-axis stars in Prime Focus are triangular or crescent-shaped.
If you add a Flattener, you will be limited to a 55mm back focus, and it will be impossible to put an OAG + EFW + manual rotator in front of the camera.
Before I go back to long-focus shooting, I'll have to change to a free back focus quadruplet with a short focal length or a normal guide mirror.
I planned to expose for 3 hours, but the humidity was increasing, so I finished in just under 2 hours.
I couldn't see the tail of the hamburger at all. So it was a failure.
I always notice this, but with the angle of view centered on these Triplets, there are few guide stars. Moreover, it took me about an hour to adjust the guide stars with my current OAG.
To be honest, guiding with the Doublet APO and OAG can only be used for shooting with a short focal length.
All the off-axis stars in Prime Focus are triangular or crescent-shaped.
If you add a Flattener, you will be limited to a 55mm back focus, and it will be impossible to put an OAG + EFW + manual rotator in front of the camera.
Before I go back to long-focus shooting, I'll have to change to a free back focus quadruplet with a short focal length or a normal guide mirror.
1ヶ月ぶりに湿ったPM2.5が残る空だったが、獅子座の三子銀河に望遠鏡を向けて見た。
3時間露出予定だったが、どんどん湿度があってきたので2時間弱で終了。
ハンバーガーの尻尾はまるで写らなかった。よって失敗作である。
毎回気になるが、この三子を中心にした画角だとガイド星が乏しい。しかも今のOAGではガイド星の調整に小一時間もかかってしまった。
Doublet APOにOAGでのガイドは正直言って短焦点での撮影にしか使えない。
Prime FocusでのOff Axisの星たちはみんな三角か三日月型。
Flattenerを入れると55mmのBackFocus縛りが出てしまい、OAG+EFW+手動ローテーターをカメラの前につけるのは不可能。
長焦点撮影に戻す前に、Free Back focusのQuadpletの短焦点か普通のGuide鏡に変えないと駄目だな。
Place: Astropical@CSky Observatory (Bortle Class 3, Moon Phase 16.6%)
Shot1 Date:3rd / Mar / 2025 21:42 (UTC+7)
Filter: Baadar SemiAPO
SemiAPO: 23X 300Secs Total 115 minues
Total 1 Hour 55 Minutes
Star RGB
CCD: QHY294C Pro 11Mega Mode BIN1
Mount :iOptron CEM70G
Guide: OAG Z61 61mm F/5.9, QHY290C.
Controler: NINA Dither, PHD2
Pre-Processing APP Drizzle None
Post-Processing PI,PS
Shot By Taro Seki Astropical.uk
コメント