The Baader FCCT with the QHY 268M on the RASA 8 - Step by Step to Perfect Collimation
This entry was posted on June 14, 2022If a sensor diagonal of 22mm is ideal for a sharp image with the RASA 8, but if you have got "only" a camera with a diagonal of 28.5mm is available - is a good image possible at all? I tried this out and will describe here step by step my way to the finished image with the Baader Baader FCCT (Filter Changer Camera Tilter) for RASA 8" and QHY cameras (various versions available) an the QHY 268M ( QHY268 M/C BSI Cooled Medium Size APS-C Cameras (various versions available) (various versions available) ) on the RASA 8, especially the adjustment of the overall system. I suggest that you read all this before you try it out yourself! For safety's sake, check every step –...
USB 3.0 - The Data Connection Between your QHY Camera and your Control PC/Laptop
This entry was posted on June 28, 2022Many support requests that reach me via Baader Planetarium are related to the increasing use of USB – no matter whether mounts or cameras are connected, the old connections (RS-232, FireWire...) have largely been replaced by USB. The USB connection has made a triumphal march around the world, and the more devices are connected with it, the number of error messages also grows. USB 3.0 stands for Universal Serial Bus and is a very fast data interface that is capable of transferring large amounts of data – including large images – to the PC in rapid succession. The raw image files are becoming larger and larger due to the large, high-resolution sensors, and the frame rates for downloading are also increasing more and more –...
Gain and Offset – Darks and Bias of cooled CMOS cameras
This entry was posted on May 3, 2022Last modified on June 29, 2022.From time to time customers contact us who have bought a cooled CMOS camera, because they are not satisfied with their image results. They have been working with an uncooled DSLR camera or even a cooled CCD camera and compare the old images with what their new QHY delivers. So we often hear: My images show way too much noise and hardly any signal from the subject". And many new astrophotographers (or those used to old technology) write to us: "My old images, taken with my DSLR, show much more of the object, even though the new camera is cooled and is supposed to be much more sensitive. If that were the case, it would be really bad! That's why we want to take a...
Tips for Choosing an Energy Rejection Filter for H-alpha-Observations
This entry was posted on November 17, 2021The purpose of an Energy Rejection Filter is to prevent as much solar energy as possible from entering the telescope in the first place and thus avoid excessive heating of the etalon of an H-alpha filter. This is done most effectively by a filter in front of the telescope. At the same time, this prevents the air in the tube from heating up - the telescope remains close to the ambient temperature, and there are no air turbulences inside of the OTA due to temperature differences. If we look at the solar spectrum, it becomes clear that such a filter must primarily block visible light. Ideally, it reflects the solar energy energy instead of absorbing it and and does not heat itself up in the...
Important System Driver Update Information - For All QHYCCD Cameras
This entry was posted on September 22, 2021Breaking news from QHYCCD: QHY - Important firmware driver upgrade 9/21 Based on an update notification of the USB chip, we added a new API in the firmware of all QHYCCD cameras between 2021.7.10 and 2021.9.4. According to the description, we were expecting that this modification would increase the stability of the USB link. Unfortunately, however, we have received feedback from our users that it can cause a random crash in single frame capture mode on some computers. These random events can occur after some minutes or some hours or even longer time frames. To test these reports, we changed back to the system driver release before 2021.7 and have confirmed that without this new API the random crashes disappear. In order to avoid this...
This entry was posted on April 5, 2018Last modified on July 26, 2019.The two tails of the comets The most impressive tail of a comet is caused by sunlight which is reflected and scattered by the dust trail of the comet - also called dust trail. In addition, there is often a gas tail, depending on the amount of gas emitted by the comet. This gas is ionized (excited to glow) by the energy of the solar wind. This ion tail shines preferably with the emission lines of OIII (501nm) and Cyan (511 and 514nm). If you want a better contrast for the comet in the sky, you must consider the following with the choice of suitable filters: There is no way to show only only the dominant light fractions of the dust tail (as with...