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Lumicon Minus Violet Filter - 1.25" # LF3120
| Brand | Lumicon |
| Part Number | LF3120 |
| Availability | available |
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Product Info
Manufacturer Description
Lumicon Minus Violet and Infrared Blocking Filters are used primarily to "bracket" the color-corrected band of refracting telescopes. The Minus Violet and Infrared Blocking Filters can also be used as "visible" filters in RGBV (red-green-blue-visible) astrophotography with reflecting telescopes. The larger Minus Violet filters are for telephoto lenses.
Most digital/CCD cameras have built-in infrared filters, in which case either the Minus Violet or Infrared filter may be used. The choice would depend on how far into the blue your primary lens is color-corrected. The Minus Violet filter blocks wavelengths shorter than about 420nm; the Infrared filter blocks wavelengths shorter than about 400nm. If your camera does not have a built-in infrared filter, the Infrared Blocking Filter is recommended, which blocks all wavelengths longer than 750nm.
The LF3120, 1.25" Minus Violet Filter, threads into the nose-piece of industry-standard 1.25" Digital Imagers.
Manufacturer part number: LF3120
Reviews
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May 3, 2019
An excellent sharpener, used properly
Pros: Cons: Comments:Many say this doesn't clear up chromatics totally with an 80mm/F5 scope. You do need a more severe filter in that case, but this is a great way to gave super-sharpness from an 80mm/F8. I could see no color shift in a medium long refractor.
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
May 9, 2012Good but not strong enough
Pros:Quality Lenses,Compact,Lightweight,Easy to Use
Cons:Not enough blue cut
Comments:I bought this filter to cut the poorly focused violet light from the achromat in my Orion ST80. While it is a help for visual work, my hope was to upgrade the achromat to aproach the performance apochromat for LRGB imaging. While it gives some improvement it is not enough.
Bottom Line: Would you recommend this item? No
The problem is that the blue cutoff is only down 50% at 450 nm which is not quite enough for this achromat. A better solution for the violet problem is to use a skyglow filter where attenuation drops to near 100% for wavelengths shorter than 450 nm. Neither filter will result in performance equivalent to a fine apochromat, but either one gives a definite improvement.This review was provided courtesy of AgenaAstro.com
Oct 28, 2011Must have filter
Pros:Easy to Use,Accurate,Quality Lenses,Lightweight,Compact,Strong Construction
Cons: Comments:I use it on my Orion 80mm ST for astrophotography and it does the job very nicely! If you have one achromatic scope as a guider, try this filter.
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
May 1, 2010Mostly a solution to a problem...
Pros:Accurate,Quality Lenses
Cons:Limited
Comments:This certainly does remove the majority of purple fringing from the moon and mars and saturn - it does not eliminate it though. I suppose the only solution is an apochromatic refractor or no refractor at all. This is permanently on my scope at the front of the diagonal.
Bottom Line: Would you recommend this item? YesThis review was provided courtesy of AgenaAstro.com
May 1, 2010Gives the best from your achromat
Pros:Colors preserved,Affordable,Brighter
Cons:None
Comments:I love refractors, they give very nice pictures, but APOs are expensive. I use two achros, a 70mm f5 as large field telescope and a 120mm f8 for deep-sky and planetary.
Bottom Line: Would you recommend this item? Yes
For astrophography, I use RGB filters, focusing for each color, so chromatism don't bother me, but for visual, I used a simple yellow (wratten #12) filter to reduce chomatism. It works, but eats most of the light.
So I was looking for a nice fringe-killer for visual use. In my mind, the Lumicon minus violet is brigther than most other filters I tested (baader fringe killers). It's a must have for visual!
For color astrophotography, I would recommand a baader semi-apo, darker but sharper with blue colors.This review was provided courtesy of AgenaAstro.com
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