Barlow lenses, Coma- and Glaspathcorrectors

The Baader 2" Nosepiece with 2" filter thread (T-2 Part #: 19) # 2408155 is the one which is also used in the Herschel wedge and should fit to the Clicklock #2956220.

It may be that there is a little bit of the anodized coating too thick inside of one of the threads - please take a look at the thread; if it is blocked somewhere, just take a knife and go along the thread once to clean it.

In the moment when you install our filters in between your camera, the flattener/reducer, Coma corrector, telescope, it becomes part of this unique optical system. And each optical system is different because many items from different manufacturers are involved. All optical surfaces interact with each other in certain ways. One way is that coatings are reflecting unwanted light away. When there is no other surface that reflects the light back - then its perfect, no halos can occur. This is what we mean with "the filter does not produce halos". He does not produce the halos by its own, inside of the filter. But in the moment when other surfaces are close to the filter, it is possible that light gets reflected back by one of these surface and halos occur.
Because there are so many combinations of camera (windows), flatteners, correctors a.s.o. possible, it may happen in that in some unlucky cases even "halo free" filters are involved in the halo production - but not guilty by themself. We know from customer that the windows in front of the chips of certain camera models are more likely to generate halos than other cameras. And some cheaper flatteners/reducers/correctors are also more often involved in the problem.
You can try to turn around the filter, it may be by chance that the reflection of different wavelength from the other side reduces the halo. Or - if anyway possible - bring more space in between filter and the other surfaces that are reflecting. That makes the halos bigger, less bright, and sometimes they disappear.
BUT: Are halos really terrible? If - for example - you make a photo of Horsehead Nebulae with filters, its impossible to get it without halos because the extremely bright star in the field. This fact and this appearance of the object is widely accepted - and it doesn´t look worse than the spikes of the spider of a Newtonian.
Please also read here: https://www.baader-planetarium.com/en/downloads/dl/file/id/287/product/2958/faq_problems_with_filters_can_have_the_strangest_causes.pdf
Even photos from professional Observatories show halos because its unavoidable. And nobody cares.
If you send us your photo with halo and detailled informations about the setup (camera, reducer, flattener, corrector, filter, telescope) then we can help you to find the source for the halo - but most likely you cannot get rid of it, only with image processing tricks.

Simply enter "M44" or "Zeiss" in the search mask of the shop and you will find all possible adaptors for this kind of telescoipe . We suggest # 1508041 M44/T-2 adaptor together with a Quickchanger system # 2456321

Glad to hear you are satisfied with the motor focuser!
Yes, separate motor units are available, we will contact you via email.

Yes, the black plastic screws are used to set the orientation of the focuser. You can also replace one of these six M5-screws with a knurled-head screw to rotate the focuser easier.