I don't have the time, dark skies or observing site to warrant using more than a dslr for astro imaging and its substantial cost. The alternative was getting the chip on Canon 750d modified and by a reputable organisation, and it was the best decision in my imaging progress. No problems and the conversion done to very high standards. Despite heavily light polluted skies I can now pick up a Hα signal. The best results require a fair bit of processing, but use a CLS filter or Hα clip filter and it gets a lot easier. Images with 750d, Skywatcher Esprit 80ed f5/400, AVX mount, exposures typically 3-5 minutes iso 1600, greyscale with Hα filter from colour. The downside is the expense, including sending a camera insured to Germany. The conversion was done in about a week.
I have an Explore Scientific ed80 and an Explore Scientific AR127, my problem is that the three screws that hold the diagonal in place, although appears tight, the diagonal still slips. I am hoping a Badder clicklock adapter will cure this but which one and how would I attach it to either scope?
If possible please try to unscrew the original clamp counterclockwise and see what diameter the thread is. A ruler or something should be quite
good for it to see if it is 54mm. Presumably it is a M54x0.75 thread as Explore Schientific/Besser/Omegon is doing and by that the ClickLock
#2956253 should be fine.
Answer by: Baader Web Team (Admin) on Jun 14, 2019 2:38:00 PM
Recently i started to use BAADER ULTRA-NARROWBAND H-ALPHA 3,5 NM FILTER and i am very pleased !
Because my regular BAADER S-II 8 and O-III 8.5 filters create much larger and blured stars than Ha 3.5 i am considering to order also ULTRA-NARROWBAND 4.5 nm OIII and SII but before i do that i need to know if this filters produce stars with the same size and similar halo to Ha 3.5 nm ??
Please send me answer or link to sites where i can find this information !
On all these new Ultra-Narrowband-Filters we have done our utmost in the selection of the costliest coating materials, to come up with a filter design that suppresses Halos to the max - by optical design. Anyone can create the similar transmission characteristics with much less expensive "rare-earth" materials. But inevitably such a manufacturer then does end up to accept less effective off-band-blocking and more stray-light to go into halos around stars.
However - there is no standard-ideal configuration of optical surfaces placement within the optical train. If there is a flattener lens involved "anything" can happen. We have seen Halos, produced by flawed coatings of the camera window or produced by reflections stemming from retro-reflection due to the radius of reducer/corrector lenses in the optical train but NOT of the filter coatings (easily visible when rotating the filter itself). We have seen Halos go away when changing the filter distance to the chip plane asf. And if the distances of the filter position between chip plane and reducer of flattener lenses work for 656.3 - it does NOT mean that the same optical distance will work equally well at 501 nm.
We "think" we have done all we can. You will need to judge when putting our filters to the test in your optical train (with the willingness to do some testing and searching for the optimum placement of the filter within the given space).
And when the result does leave something to be desired (and each and every O III-filter on this earth will show more residual halos around very bright objects than an H-alpha-filter), then you possibly could arrange "right of return" with your dealer.
Answer by: Baader Web Team (Admin) on Jun 6, 2019 4:28:00 PM
Hi Is this for 'visual' use only or can it be used with a modified DSLR? I already an Ostara O III 'visual' filter but it yields very bright background. I've tried using with IR cut filter but to no avail. Many thanks Steve H
We cannot say if there will be more constrast with this filter than with the competiting filter because we have not tested their filter. Generally our visual OIII filter can be used with DSLR but even an modified DSLR is not a good camera for narrowband (OIII) photos. Only every 4th pixel is sensitive for this wavelength. You loose 3/4 of the resolution of the sensor wich makes the photo weak and unsharp.
Answer by: Baader Web Team (Admin) on Jun 3, 2019 2:04:00 PM
Important warranty information
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