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Baader Planetarium Semi-APO Filter 2" FSAPO-2

3.0 3.0 out of 5 stars 5 ratings
$169.00
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Purchase options and add-ons

Brand Baader Planetarium
Material neodymium
Photo Filter Thread Size 2 Inches
Coating Description No Coating
Photo Filter Effect Type Ultraviolet
Water Resistance Level Not Water Resistant
Product Dimensions 2"L x 2"W

About this item

  • Baader Planetarium Semi APO Filter combines the Baader Fringe Killer coating formula with the Baade
  • Zero image degradation
  • Famous Baader Quality
  • Works as a great Mars filter
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Baader Planetarium Semi-APO Filter 2" FSAPO-2
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Price$169.00$29.99$107.60-5% $47.50
List: $49.95		-15% $16.99
Typical: $19.99		$24.95
Delivery
Get it May 16 - 21
—
Get it May 16 - 21
Get it as soon as Tuesday, May 14
Get it as soon as Tuesday, May 14
Get it as soon as Tuesday, May 14
Customer Ratings
3.03.0 out of 5 stars5
5.05.0 out of 5 stars5
4.04.0 out of 5 stars12
4.54.5 out of 5 stars810
4.54.5 out of 5 stars217
4.24.2 out of 5 stars231
Brightness
—
—
—
4.5
4.0
4.3
Easy to use
—
—
—
4.3
4.2
4.5
Value for money
—
—
—
4.2
4.2
4.3
Sold By
Agena Astro
SVBONY Direct
Agena Astro
Amazon.com
Amazon.com
Amazon.com
thread size
2 inches
103 millimeters
3.2 centimeters
0 millimeters
0 millimeters
0 millimeters
photo filter effect
Ultraviolet
Observe
Enhancing
Ultraviolet
Ultraviolet
Ultraviolet
material
neodymium
Aluminum
Neodymium Glass
Paper
Paper
Paper
water resistance
not water resistant
waterproof
not water resistant
not water resistant
waterproof
waterproof

Product Description


Baader Planetarium Semi APO Filter 2"

The Baader Semi APO filter is a truly innovative product unique to Baader Planetarium. Founded by combining properties from two of their most popular filters the Baader Planetarium Semi APO Filter is a truly effective tool in fighting false color.

Baader's newest addition for Achromat owners. The Semi-APO works like it's 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. It's 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 manufacturer's filters.&

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Baader Planetarium Semi-APO Filter 2" FSAPO-2

Baader Planetarium Semi-APO Filter 2" FSAPO-2

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Customer reviews

3 out of 5 stars
3 out of 5
5 global ratings

Top reviews from the United States

J.Jones
5.0 out of 5 stars Five Stars
Reviewed in the United States on July 20, 2015
Verified Purchase
Great filter, beaware it dims your field as well
2 people found this helpful
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Amazon Customer
1.0 out of 5 stars 9 doublet by explore scientific in hopes of making the scope work better for photography
Reviewed in the United States on September 14, 2016
This filter may work for long tube F8 or higher refractors. I bought one for e my AR102 F6.9 doublet by explore scientific in hopes of making the scope work better for photography. On this scope the filter did little to the overblown blue glow around stars on long exposures. I tried shots of nebula and had the same issues with all the stars around the shot. While it did cut the blue glow some. this is not a fix for a short tube refractor. Tried it on my Celestron d70 I bought for a guide scope and solar scope. It did not work on that scope either.
9 people found this helpful
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Michael J Wood
2.0 out of 5 stars Not Worth It
Reviewed in the United States on January 12, 2013
Verified Purchase
I bought this filter to use with my 6" achromatic refractor after reading other reviews around the net stating that it reduced chromatic aberration (CA) without affecting natural color like some other filters.

I've tried the filter several times while viewing Jupiter, and it does cut down a lot of the CA, but does this at the expenses of dimming the object too much at higher magnifications. I found that I liked the views of Jupiter with CA better than the views with the filter. I also felt that I was seeing more detail on the planet without the filter and that the filter caused somewhat of a loss of contrast.

Considering the cost of this filter I feel that the value just isn't there and I regret purchasing it.
12 people found this helpful
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Amazon Customer
4.0 out of 5 stars Great for Moon and Planets with long Achromats
Reviewed in the United States on February 9, 2015
This is a great filter for owners of longer f-ratio achromats, like the 6" f8, 120mm f8.3, or 4" f9-10. Removing the haze of unfocused violet light sharpens up lunar and planetary detail quite a bit, while the color cast is closer to neutral than in some competing filters (not to mention a traditional plain yellow filter). I have various Baader filters and the optical and physical quality is always top-notch. My only complaint is that the labels on the filters are silver, and nearly impossible to read under dim light. The labels should really be white.....I've made tiny tape labels to identify mine while observing.
This filter is especially fantastic for daytime observing of the Moon and Venus. In addition to cleaning up the chromatic aberration the slight yellow tint darkens the blue sky, and increases contrast dramatically.
If you have a faster scope, like f5-f6.5, it will have more chromatic aberration. This filter will still help but some of the unfocused light will still pass through. Baader makes another filter that's stronger - I think it's called the Contrast Booster - that would probably work better on such scopes but adds more of a yellow tint.
6 people found this helpful
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R. Sakala
2.0 out of 5 stars Wasn't that effective for my eyes......YMMV
Reviewed in the United States on November 27, 2013
Verified Purchase
I tried this on a f/5 and a f/6.5 refractor, and it really didn't didn't reduce the CA as much as some people have reported. Now I must also say that people have different sensitivities to CA and also CA reduction filters, so it could work for you. Doesn't change the color of the object like a long pass 495 does, or a yellow #11
4 people found this helpful
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