If you notice that the edges of your image(s) are not sharp then image tilt may be present in your system. Image tilt is caused when the sensor is not perpendicular to the light path. The cause(s) of image tilt can be many and can include flattener/corrector lenses, tilted focuser drawtube, extension adaptors, camera angle adjusters as well as inherent camera sensor tilt in the camera body itself. Being able to correct for this image plane tilt is important and essential to get perfect focused sharp star images across the field of view.
Baader Planetarium currently offer three accessories - their "Tilter family" - that can help compensate for image plane tilt.
Baader UFC-Tilter (#2459146, € 276,-)
: an S70 dovetail accessory that fits on the telescope side of the UFC and it is compatible with the entire Baader UFC system. The unit allows an adjustment tilt shift of the UFC Base (and an attached camera) of up to 1° to compensate for misalignments in the image field. The Tilter is only 9.75-10.50 mm in optical length depending on amount of tilt adjustment made.The wide range of telescope- and camera-side adaptors allow the UFC-Tilter combination to be used on a...
We very much regret the delay in the availability of the FCCT. We had developed the FCCT primarily for the QHY163 M/C Medium Size CMOS cameras, cooled. Our customer Christoph Kaltseis had already been able to test the prototype in the first phase of development with the QHY163M (see his report below). When we were almost finished, a message came from QHY that Sony would discontinue the 163 chip. As a result, we too stopped FCCT production in frustration. However, in mid-2021, the QHY163 was suddenly available again - and we were keen to design a solution for the next larger 90mm camera bodies as well. This has now resulted in two versions of the FCCT, with the FCCT II made for the new QHY 294M / C Pro Medium Size Cooled CMOS camera and QHY268 M/C BSI Medium Size APS-C cameras, cooled. Now it is possible to mount all QHY cameras with 77mm (FCCT I) or with 90mm (FCCT II) body diameter on the RASA 8, change filters - and adjust the position of the camera sensor precisely and quickly with the camera mounted. The FCCT I can also be upgraded for 90mm cameras if required. After an eternally...
The Baader M68 is a system that fulfils many wishes in an elegant way and with high stability. All distances can be set precisely, and with the
Baader M68-Tilter (#2458170, € 255,-)
an ingenious extension has been added to the system.
But before talking about the tilter, let me tell you how I came to this system. When I was testing the prototype of the
Baader FCCT (Filter Changer Camera Tilter) for RASA 8" and QHY cameras (various versions available)
for the RASA 8, I wished that the connection and collimation possibilities for the C14 were just as sophisticated. I have acquired enough experience so that I can "read" the image of the C14 so well that I know whether I am really seeing a tilt or just a problem with the distance. Of course, this led to the desire to use a tilter to adjust the field perfectly to the camera sensor.
I mentioned this idea in passing once during a conversation with the Baader company, and we discussed what functions would have to be incorporated so that imaging with the C14 EdgeHD could be optimised as easily and smoothly as with the RASA 8 and the FCCT. After...
Baader UFC Tilter
The effects of image tilt can ruin an otherwise great astrophoto. Image tilt (or image plane tilt) happens in imaging when an area towards the edge of the field exhibits out-of-focus or imperfect star images and is caused by the image sensor not being pefectly perpendicular to the light path. Focuser skewness (or "droop"), flattener/corrector lenses, extension adaptors, camera angle adjusters as well as inherent camera sensor tilt in the camera body itself are all causes of image field tilt. Being able to correct for this image plane tilt is important and essential to get perfect focused sharp star images across the field of view.
For those that do astroimaging with our Universal Filter Changer (UFC) we are pleased to annnounce a NEW accessory to help compensate for image plane tilt - the
Baader UFC-Tilter (#2459146, € 276,-)
. This is a telescope-side UFC S70 accessory that is compatible with the entire UFC system and can be used with many refractor and Celestron 11" and 36cm RASA imaging setups. The unit allows an adjustment tilt shift of the UFC Base (and an attached camera) of up to 1° to compensate for misalignments in the image field. The...
How do I adjust tilt and achieve micron adjustment with the FCCT, the UFC and M68 Tilter?
Each tilter essentially consists of 3 pairs of opposing set screws which independently move the inner tilt mechanics and are easily accessed from the side using the included hex key (Allen wrench). These screws have tapered and hardened points that bear against a precision hardened ‘zero-clearance’ steel-counterpart. The direction that each set screw moves the tilter is shown with an etched arrow next to the individual screw. On the FCCT the extra-long hex-key with handle also serves as torque-control against overtightening. As soon as the handle starts to rotate (to "flex") without continuing to turning the screw then the maximum torque allowed is reached and instead of continuing to increase pressure on that screw, the other screw in that pair first must be unlocked by a very small amount.
CAUTION: Never tighten a screw all too firmly, only light to medium tension is required to hold the tilter with zero play. Tightening the screws too hard may damage the hardened screw tips.
Check each set screw to make sure it is lightly tightened down (seated). The screws only need to bear against the internal mechanism with light pressure.
To move the tilter in a particular direction, first loosen the opposite direction screw a very small amount, then lightly tighten the screw that moves the tilter in the direction you want it to go. Only very small adjustments are needed to square the mechanical axis, so only move the screws a small amount.
Final small tweaks may be made by very slightly increasing the pressure of just a single screw, or very slightly decreasing the pressure of the opposing screw.
It is recommend that you start with the tilter set at its nominal position with both parts flush. The tilt allowed is approx 0.4 mm to either side.
The amount of loosening and tightening controls the amount of tilt movement. Always put the image center into perfect focus first and then work out the edges.
A simple way to check if overtightening occurs is to closely inspect each single image frame taken during the adjustment procedure to see if some upper or lower-side movement (that is: lateral movement) is visible when trying to move one screw in the system to adjust for more angular tilt. Even slightest lateral movement would indicate that at least one of the three pairs of screws is severely overtightened, as each tilter-system is mechanically matched to zero-play.
In case lateral movement is visible at all in the image frame, then loosen the opposing screw by the same amount and it will cause a tilt action immediately. You will need some time to "get the right feel" just how finely each these three pairs of screws work as a team, to increase pressure and reduce pressure in order to do the adjustment in very minute increments. In this way, micron movements are possible.
The FCCT is designed to carry up to 2 Kg of camera equipment, the larger M68 and UFC-tilter can take up to 5 Kg of camera total weight.
The tilter should be positioned close to the camera, to reduce additional loads from having the camera cantilevered far from the tilter.
Our company exists now for more than 50 years. In this time, more than 15.000 Baader Planetariums (the first patented product of our company) help all over the world to give students an understanding of astronomical correlations. In our own manufactory, more than 500 observatory domes have been produced and delivered turnkey-ready. Instruments and telescope accessories from "Baader" are known for their high qualities by many astronomers and universities. We consider it our duty and obligation, not only to sell telescopes, but an indivdually selected telescope system, that brings you a lifetime of joy.