Customer Comments

Here is a review of the filter slide kit on Ed Ting's Scopereviews web page:
Please note the update on the bottom since the addition of the threads.

"Anyone that does not have this accessory is out to lunch. Talk about bang for the buck. I have all four Lumicon filters but seldom use anything other than the OIII. Well, the filter slide has opened my eyes. Being able to click from DS to UHC to OIII and instantly compare was fascinating and surprising. The UHC was more aesthetically pleasing and the DS extended the comets tail almost four fields of view. Also, being able to slide in a DS or UHC while looking at the HII regions in M101. I dont know how I lived without this useful gizmo for so long! Also got to use the denk bino adapter (see below) and it worked better than advertised."

"I also put the new Denkmier Deep-Sky binoviewer through it's paces. The denk
with OCS and 16mm Nag T5 is a great combo. M51 was ridiculous! ALL the
globulars were improved. Not only the 3D effect but the contrast boost. Even though the light is cut in half using two eyes make up and even improve all of the
brighter objects such as M51, M83, M101, M13, M33, M17, but the Veil and fainter galaxies were hurt. I have always been a bino fan on the moon and planets and now to be able to do deep sky as well is pretty cool. Interesting side note,
Jim had a Televue Bino configured with the denk OCS and we did a side by side
on my scope. Two of three observers thought the Denk had superior contrast.
IMHO they were so close it was moot. Also, I had one of Roger's ASTROCRUMB denk adapters that extended the filter slide so I could use the bino w/ filter slide. I could go on and on and on about viewing M8, M20, M16-17, M27 with the denk and filter slide. Take my word, it's a killer view."


Doug F.

25" Obsession #19

I love it! I ordered a set of 2" color filters in preparation for
Mars this summer. I may also get an H-beta later. Right now, I have
an O-III and a Sky Glow. I used the O-III quite a bit at TSP and I
use the Sky Glow a lot here in Houston. These filters really help for
certain things & conditions but, before the slide, I rarely used them.
Now they are regular tools for me.

Thanks again,
Robert R.
15" Obsession

Your FilterSlide is one of the best accessories I can imagine for a big Dob.
It makes the difference between using a filter and not using one in many
instances, because it's so convenient to be able to go between different
types of filters or no filter at all. It's also nice not to have to worry
about threading the filter onto the eyepiece or dropping one or the other in
the process. I have one slide with a Deep Sky, UHC, and OIII
semi-permanently threaded in and another with rotating miscellaneous color
filters. RGB would be good for imaging. I hope you're selling a lot of them;
it's a really useful product.

18" Obsession

Roger's filter slide is the best non-optical accessory I have ever used. It is so easy, educational and fun switching from a non-filter to a filter while looking at emission/planetary nebula. Highest recommendation for this tool.

22" Starmaster

I recently installed the Astrocrumb filter slide on my 18 inch, f/4.5 truss tube dob. Now I'm able to switch between O-III, UHC and other filters instantly without fumbling around with expensive accessories in the dark and cold. A big plus when hunting down planetaries or even exploring the intricasies of the Veil Nebula.

The unit installed easily in my upper tube assembly. AstroCrumb recommends that two people perform the installation process - and I know now that this definitely would have been the way to do it, but I was able to do it myself after carefully placing the unit according to the instructions and test fitting the parts.

The only thing that didn't come in the filter slide kit was a plastic case to keep the filter board and filters in for storage. There is no reason - other than dust - why you couldn't leave the slide board in its rails all of the time since the unit doesn't protrude out the ends of the UTA.

By the way, the unit had another benefit. It effectively baffled my focuser from stray light leaking in around the lower edge of my UTA when the shroud isn't on it.

I highly recommend some kind of filter slide for any deep sky observer. I find that I'm getting the benefit of filters (and fun) more than before because I have easy access to them. Astrocrumb builds great filter slides and I can recommend them.

18" Obsession

For the money, I do not believe you can beat Roger's slide for value. I made one about a year ago. If I didn't have a plaer-jointer, I would have had problems doing it. Plus, it took me a while to get it right (trial and error stuff).

20" Obsession