Baader Planetarium Semi-APO Telescope Filter
Item#: HN-AAS021
Your Model Size
Price:
$78.00 to $137.00
17%
Description
Baader's newest addition for Achromat owners. The Semi-APO works like its name implies - delivering an amazingly neutral view, while cutting most of the annoying and contrast-robbing violet fringe that plagues all achromats. The Semi-APO filter combines a stronger Fringe Killer coating formula with the Moon&Skyglow Neodymium substrate. The result is similar performance to the Fringe Killer + Moon&Skyglow combination, but with a slightly stronger violet cut - and at an even greater $$ value.
The Semi-APO filter benefits from all the host of world-class Baader filter attributes. The Semi-APO filter is truly the world's most advanced 'minus-violet' type filter in every regard. Its high efficiency and neutral coloration make it practically disappear in use - while making most of the violet fringe disappear! The effects on sharpness, contrast, and aesthetics are remarkable, even with small refractors. The RGB enhancement of the Neodymium substrate actually boosts color contrasts, particularly for Jupiter and Mars.
As a side benefit, the Semi-APO filter has also proven to be the best Mars filter we've used - with ALL Telescopes, including large Dobsonians, SCTs, and Apochromats. The unique properties that result from the combination of the Fringe Killer's blue wavelength attenuation (attenuation - not total elimination), plus the selective Neodymium RGB passbands, result in a significant contrast enhancement of Martian features. The image retains its natural coloration and brightness, and the optically polished surfaces maintain every bit of the image sharpness, unlike other manufacturers' filters.
The high quality of Baader Planetarium filters permits their use well ahead of the focal plane with no image degradation (ie, for cameras or binoviewers). The inclusion of Baader's renowned UV/IR Cut coatings on the Semi-APO eliminate UV and IR wavelengths to make it ideal for high-resolution imaging with Webcams, DSLR, and CCD cameras. The high transmission and fringe reduction work great for both planetary and deep sky imaging.
Dimensions & Specifications
Brand
Baader Planetarium
Size
1.25 Inches, 2 Inches
Telescope Accessories Series
Filters
Type
Color Correction Filters
Options
Model Size:
1.25 Inch Semi-APO Filter, 2 Inch Semi-APO Filter
Sale Price:
$29.98
62%
Suggestions for You
REVIEW SNAPSHOT®
by PowerReviews(based on 8 reviews)
Ratings Distribution
100%
of respondents would recommend this to a friend.
Pros
- Great optics (4)
Cons
Best Uses
- Astronomy (5)
- Astrophotography (3)
- Bright conditions (3)
- Reviewer Profile:
- Avid adventurer (4), Casual/ recreational (3)
- Was this a gift?:
- No (3)
Reviewed by 8 customers
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Displaying reviews 1-5
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Pros
- Does What It Is Designed
Cons
- None
Best Uses
- Bright Conditions
Comments about Baader Planetarium Semi-APO Telescope Filter:
This filter eliminates most of the purple fringing in my meade ar-6. You can still see a small amount of purple around jupiter, but it is greatly reduced. It does a excellent job of letting light through with just slightly darker views when it is on. You can leave it on for all your viewing for the most part. I did remove it to view some of the faintest objects and did notice slightly brighter views without the filter.
- Was this a gift?:
- No
Pros
- Easy To Use
- Good Padding
- Great Optics
- Strong Construction
- Widely Compatible Adapter
Cons
- Not well advertised
Best Uses
- Astronomy
- Terrestrial Viewing
Comments about Baader Planetarium Semi-APO Telescope Filter:
An excellent product. If you have a good achromatic refractor, this filter will make it.. 'semi-apo' !
Why spend $thousands for an apo when you can enjoy your good achromat.. er, semi-apochromat !?? It is THAT GOOD !
- Was this a gift?:
- No
Pros
- Great Optics
Cons
- None
Best Uses
- Astronomy
Comments about Baader Planetarium Semi-APO Telescope Filter:
Dramatic reduction in chromatic aberration in my achro refractor. Yielded crisp well defined images, and increased contrast of the Moon and Jupiter with little or no discernible color tint. Only a very thin color (purple) halo on Lunar limbs.
Service and delivery comments:
The service was excellent; the delivery was prompt - just a couple of days as promised.
- Was this a gift?:
- No
Pros
Cons
Best Uses
- Astronomy
- Astrophotography
Comments about Baader Planetarium Semi-APO Telescope Filter:
I was thoroughly impressed with this filter. I've come to expect a degree of "padding" of the capabilities of items by the marketing crews over the course of my 40 years, and while I expected this filter would be a good performer, I did expect some of that padding. I have to say for once I was surprised to find a product that lives up to it's marketing claims though. This filter actually does an excellent job of killing fringe.
I have a Celestron C6-RGT achromatic refractor and did see distinct (but moderate) violet fringe on bright objects, such as Jupiter, the moon or even bright stars such as Sirius. I attached the 2" Baader semi apo filter to my diagonal, and it cut the fringe almost completely. In fact it cut it to the point I cant see it at all unless I spend time specifically focusing on the edge of bright objects specifically looking for fringe, and then it is barely perceptible. It cuts it so well you forget you are using an achromat and "fringe" leaves your vocabulary!
In addition to the filter working incredibly for killing violet fringe, it has zero color corruption. Jupiter with the filter on was clearly orange, brown and white, not tinged pink by the filter as I expected, and the moon displayed sharp white, gray and black contrast with no tinting at all. Image clarity is crystal clear as well and objects actually looked sharper with the filter on than without it. I now leave the filter attached to my diagonal all of the time and use it for all viewing. It works that well.
This is one of the pricier fringe killer filters out there, and I wouldn't complain if they dropped the price. With as well as this filter works though, it's worth the money!
Pros
- Easy To Use
- Great Optics
- Strong Construction
- Widely Compatible Adapter
Cons
Best Uses
- Astronomy
- Astrophotography
- Bright Conditions
- Travel
Comments about Baader Planetarium Semi-APO Telescope Filter:
This is great filter and does just what it says it gonna do. I'll add on a moon and sky glow or a minus violet and its even better. Considering what an APO costs, having a few inexpensive filters that can make the viewing almost as good is well worth it. I wound highly recommend this filter to anyone with an Achromat or even a reflector.
Displaying reviews 1-5
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