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Thread: Should I buy the Zhumell UHC filter?

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    Default Should I buy the Zhumell UHC filter?



    Does anybody have any experience with the Zhumell UHC filter? Is it worth getting or should I invest in a more expensive brand?

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    Default Re: Should I buy the Zhumell UHC filter?

    I own both a 1.25" and a 2" Zhumell UHC filter. I'm not really sure if one filter brand is that much better than the next providing you aren't buying a toy.

    I don't use filters all that often, but the only filter I use more than my UHC filter is my moon filter. The moon and UHC filters are the only ones I take with me every time I go out.

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    Sky Glow AP filter,
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    filter, UHC filters, planetary filters.

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    Default Re: Should I buy the Zhumell UHC filter?

    I was interested in the 2" see it all set (which i beleive contains the UHC) and i came accross some reviews. See if this helps you decide. Also search the forum a little bit. There has been a lot of dicussions on the Zhumel filters.

    Lab Test and First Light Report of 2" Zhumell Filter Set - Review
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    Steve

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    Default Re: Should I buy the Zhumell UHC filter?

    Hello CosmoJoe,

    thanks to the link provided by Steve, you can see that the Zhumell UHC has a realtively low transmission (less than 85%) on the OIII lines, and about the same or maybe slightly more on the H-Beta. The other drawback is, the far blue and UV will be transmitted, lowering the contrast of the nebulas. Even worse is the OIII filter. The better news is about the LP (Neodymium multiband filter), but again, this filter is without the UV/IR cut

    I'd have a look if there are any reasonably priced offers at Astronomik, Denkmeier, Lumicon, Thousand Oaks, or other companies, specialized in filter design and making. In general, the nebular filters should completely cut away the deep blue /UV, and the far red /IR. They should also transmit more than 90% of the nebular emission lines light.

    Best

    JG
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    Default Re: Should I buy the Zhumell UHC filter?

    thank you that helps a lot

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    Default Re: Should I buy the Zhumell UHC filter?

    Look at the Orion UltraBlock Narrowband Filter. Its the one i settled on when i was comparing all the filters. Seems to be a favorite of a lot of people.

    Orion UltraBlock Narrowband Filters | Orion Telescopes: Filters
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    Default Re: Should I buy the Zhumell UHC filter?

    Regarding the Orion Ultrablock filter, below are the ARO spectral curves,

    http://www.karmalimbo.com/aro/pics/filters/narrow.jpg

    If particularly that filter is worth of 100USD, that's a question. However, the spectral curves do not always tell the full truth about the filter performance.

    Best

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    Default Re: Should I buy the Zhumell UHC filter?

    I case anyone is interested, Lumicon is up & running again. Their filters are more expensive than many other brands, but in the optics industry you tend to get what you pay for.
    Regards,
    Clay

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    Default Re: Should I buy the Zhumell UHC filter?

    http://www.karmalimbo.com/aro/pics/filters/narrow.jpg

    from that graph it looks like lumicon and 1000 oaks would be the way to go. the 1000 oaks looks like it lets in h-alpha, niii, sii... i don't know if that's good for nebula or not. also the lumicon looks like it wants to let those in but does so poorly. I have read a few forums in which the dgm npb filter is a favorite nebula filter to go with a oiii(which i have). however the lumicon and dgm seem to block mecury vapor lights(but are almost phased out and being replaced with the more efficient metal halide or led). obviously i'm not going to be able to get out of spending 150 to 200 usd on one so which do you guys prefer between the three?

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    Default Re: Should I buy the Zhumell UHC filter?

    Hello CosmaoJoe,

    the H-Alpha, SII, and NIII do not play a role in visual observations, unless you have a very large aperture to allow for the color vision of the nebulas.
    Regarding the UHC filters, you can also consider the Astronomik UHC, which is a couple of nanometers broader than the Thousand Oaks narrow-band, but it has the second highest transmission on the OIII and H-Beta,

    http://www.karmalimbo.com/aro/pics/filters/medium.jpg

    and it is cutting better the C-lines than the Thousand oaks. The Astronomik filter has one of the best optical qualities (no blurr around the stars, no ghosting), and it can be stacked with other filters, like the blue(RGB)CCD Baader filter, to cut the red around the H-Alpha.

    I'd simply take the Denkmeier, Thousand Oaks, or Astronomik UHC (not the E-version)*, depending on the price.
    )* The Astronomik UHC-E is a combo, for the OIII emitting nebulas and for the comets with the Cyan emission lines

    Best

    JG
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