Excellent service from FLO. Extremely well packed. No problem with the flocking rolled up short way, I simply unrolled it and put some weight on it until tomorrow when it will be nice and flat. Cannot fault them. Read all 25 customer reviews About this product Model: flockingcmx1m Part Number: Average Rating 25 Reviews : Write a Review and share your opinions!
Good, but needs cleaning. Friday, 22 October Tamas. Black Velour Flocking Material. Thursday, 24 June Michael. Friday, 4 June Styliani. Good quality flocking. Monday, 19 April Robert. Quality flocking. Thursday, 24 December Andrew. Great product - deep black. Omega Centauri sketch. Coma cluster sketch. Jupiter photo. A Newtonian reflector's open tube or any other OTA for this matter is an attractive target for unwanted stray light, which can come from anywhere: Moon, street lights or even bright stars.
This light bounces off telescope's inner surfaces and eventually enters the focuser and the eyepiece. As a result - the background lightens up and the image contrast is harmed. There are several solutions to this problem: Attaching an extension the the tube which is also useful for dealing with dew , baffling the telescope, or flocking it from inside with light absorbing material.
Baffling is probably the most effective method if calculated and done properly , while flocking is the easiest. The idea behind flocking is to increase light absorbing properties of the inner surfaces of OTA by covering it with a special material.
It allows absorbtion of the unwanted light, rather than reflecting it. In practice, in unbaffled tube, some stray light will always get to the eyepiece, but flocking can minimize the harm. Usually a telescope is painted with black, matte paint inside. However this paint is usually far from being an ideal light absorber, especially at oblique angles.
See the following photo for a comparison of a special flocking paper left and my Orion reflector's native paint right. For this purpose I used flocking paper from Protostar. It's VERY black, relatively easy to install, and resistant to moisture according to manufacturer. The objective tube had a lack of flocking just aside of the lens cell thread.
In adittion, the inner surface of the lens cell was flocked also not shown in the image. There was also another surface that greatly reflected that was the inner surfacte of the obective thread. It can be seen as the innermost black circle in the image below. The next image shows the main tube which was already flocked by default, but not completely, so it was necessary to add some flock in the end of the tube.
The next component to be flocked was the drawtube sorry, no image of it , but only the end of it was needed to be flocked. The rest of the drawtube was already flocked by factory. The origin of this non-flocked surface is that there was a piece attached to the end of the drawtube to keep the drawtube centered.
Next component to flock was the focuser drawtube. In addition, the front flange of the front reducer was flocked also. Note the slightly visible line on the bottom right of the focuser drawtube, it is the joint of the flocking piece. This is the level of accuracy taht I normally achieved by using a CAD calculated template very good, in my opinion. A visual inspection revealed that the ring seen in the analysis was produced by the inner surface of the thread that attaches to the focuser the farther flocked surface in the image.
Apart of this, the surface right beside of the rear focuser was flocked too. One is the housing of the filter holder, that I choose to skip to maintain its functionallity, and I will check how it works, and the other is the housing of the rear reducer, so is a hidden surface. And finally, the Canon EOS adapter, that is almost hidden by the rear reducer, but I preferred to flock it, to avoid the possibility of a reflection produced by the filters of the camera.
Once all the pieces are flocked, it is important, in my opinion to take care of the fiber losses to avoid them to mess the optics. To clean any fiber I used a vacuum cleaner and carefully cleaned all the pieces. In order to avoid to hit and mark the flocked surfaces I flocked the end of the vacuum cleaner too. Maybe you will think that this is too much care, but taking into account that the idea is to not to open the telescope again in several years, I think that all precautions are welcome.
After cleaned, the pieces were stored into plastic bags to avoid any environmental dust to mess them. Once the telescope was assembled, I made the same photograph through the optical system, to check the improvement:. The improvement is clearly noticeable. There is a dim ring that a suspect that can come from the edge of the drawtube, but in any case seems to bee dim enough. In any case, it will be necessary to check it with real images and see how well are them calibrated with the corresponding flats.
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