About Visual AstronomyCustom Telescope ModsTips & TricksNewsObservationsRSS FeedContact

Friday, October 31, 2008

4 Color Filters You Should Have


Every amateur astronomer should have a few good color filters in their eyepiece case. Color filters can be especially useful when observing planets. They help to reduce glare from bright planets like Jupiter and can bring out subtle contrast not as readily visible in natural color. While the color exaggeration may be distracting at first, it can really help you to distinguish those tiny details on Mars and help to see cloud formations on Jupiter. The following 4 filters (specified by their "Wratten" number) are my favorite color filters for both planetary and deep sky use.

#23A Red Filter


The #23A filter is a red filter and is very useful for observing Mars. This filter will help to increase the contrast between the Martian surface and the dark Maria. It can also be used on Jupiter and Saturn. This filter's relatively low light transmission (25%) makes it well tailored for larger scopes. Therefore, those with smaller scopes (130mm and smaller) may want to try the #21 orange filter instead.

#80A Blue Filter


The #80A Blue filter is an excellent filter for use on Jupiter and Saturn. This filter greatly increases contrast in Jupiter's festoons and other cloud formations. It will also help with contrast in the Great Red Spot. On Saturn, it helps to increase contrast in the cloud belts and may help you see some polar features. This filter also has a relatively low light transmission (30%), so users of smaller scopes may want to try the next filter instead.

#82A Light Blue Filter


The #82A light blue filter is similar to the #80A, except it has a higher light transmission of 73%. This filter is excellent for use on Jupiter and Saturn, especially in smaller scopes. I prefer this filter over the #80A even in my 10" dob, though, since the color difference is noticeable, yet very subtle. Surprisingly, this filter can have interesting effects on some bright deep sky objects, too. I have used it on some brighter galaxies, such as M31, with positive results. This trick, however, will only work in large scopes (10" and larger). I'm curious to see what this filter would do for M45.

ND96 Neutral Density Filter


This filter is not really a "color" filter, but rather a "neutral density" filter which transmits the same across the spectrum. Its low light transmission (13%), however, has earned it the nickname of "moon filter". This filter is great for reducing glare from bright objects like the moon and Jupiter. Using only a ND96 filter on Jupiter will have astonishing results in the form of greatly increased contrast. This is really an effect of the eye, however. Since the image isn't so blindingly bright, it is easier to see minute details. On some larger scopes you may want to try stacking ND96 filters while viewing the moon for more comfortable viewing.

To receive more articles like this, subscribe via RSS Feed or e-mail!

Clear skies!

16 comments:

张栋 said...

san francisco 49ers jerseys
jordan 11
adidas outlet
mlb jerseys
cartier watches
kobe 9
thomas sabo
snapback hats
jordan shoes, http://www.jordanshoes.us.com/
michael kors outlet online
mac cosmetics
hogan,hogan outlet,scarpe hogan,hogan sito ufficiale,hogan interactive
cheap jordans, http://www.cheapjordanshoes.in.net/
lebron shoes
coach outlet
ray-ban sunglasses, http://www.raybansunglass.com.au/
lebron james shoes
barcelona jersey
longchamp outlet
vibram fivefingers
oakley canada, http://www.oakleysunglassescanada.com
cheap oakley sunglasses
nike air max uk
louis vuitton outlet store, http://www.louisvuittonoutletstore.name/
louis vuitton uk
the north face outlet
ray ban sunglasses
michael kors uk
nike huarache
nba jerseys, http://www.nbajerseys.us.com
tory burch sandals

Jianbin Jianbin said...

jianbin1111
michael kors handbags clearance
true religion outlet,true religion jeans,true religion kids,true religion jeans sale,true religion jeans for men,true religion jacket,true religion sale
michael kors online outlet
louboutin uk
michael kors handbags wholesale
mlb jerseys wholesale
dallas cowboys
michael kors outlet,michael kors outlet online,michael kors,kors outlet,michael kors handbags,michael kors outlet online sale,michael kors handbags clearance,michael kors purses,michaelkors.com,michael kors bags,michael kors shoes,michaelkors,cheap michael kors
michael kors outlet
ugg boots on sale
barbour clothing
cheap uggs
new york knicks
replica handbags
nfl jerseys wholesale
nike free run uk
roshe run women
cheap nfl jerseys
san francisco 49ers
wedding dresses
los angeles clippers
air jordan shoes
pittsburgh steelers
uggs on sale
toms outlet
nike running shoes
chanel handbags
football shirts uk,soccer jerseys uk,cheap soccer jerseys uk
michael kors handbags,michael kors outlet,michael kors outlet online,michael kors,kors outlet,michael kors outlet online sale,michael kors handbags clearance,michael kors purses,michaelkors.com,michael kors bags,michael kors shoes,michaelkors,cheap michael kors
michael kors outlet

dong dong23 said...

hollister clothing
michael kors outlet online
christian louboutin
louis vuitton outlet
jordan 8s
kobe bryant shoes
nike huarache shoes
nike uk
ray ban sunglasses
true religion outlet
michael kors handbags
michael kors outlet online
tory burch flats
oakley sunglasses
ralph lauren outlet
beats headphones
louboutin pas cher
true religion jeans
louis vuitton outlet
michael kors outlet clearance
louis vuitton handbags
louis vuitton outlet
gucci outlet
louis vuitton handbags
air jordan pas cher
coach factory outlet
jordan 11s
adidas uk
gucci outlet
mont blanc pens
lebron james shoes
polo ralph lauren
michael kors outlet
burberry outlet
gucci outlet
louis vuitton handbags
burberry outlet online
nike roshe runs
jordan 3
michael kors outlet
20164.9wengdongdong

Yuanyuan Lin said...

7.14lllllyuan"timberland shoes"
"soccer jerseys wholesale"
"longchamp pliage"
"cheap oakley sunglasses"
"true religion jeans"
"louis vuitton pas cher"
"rolex orologi"
"christian louboutin shoes"
"michael kors clearance"
"cheap nba jerseys"
"oakley sunglasses wholesale"
"tory burch shoes"
"tory burch outlet"
"chicago blackhawks jerseys"
"longchamp outlet"
"omega watches"
"adidas trainers"
"cheap nike shoes"
"nike outlet store online"
"michael kors outlet clearance"
"michael kors uk"
"montblanc pens"
"michael kors canada"
"longchamp handbags"
"ray ban sunglasses"
"abercrombie and fitch"
"mcm outlet"
"puma shoes"
"ralph lauren uk"
"nike air max 90"
"rolex watches,rolex watches,swiss watches,watches for men,watches for women,omega watches,replica watches,rolex watches for sale,rolex replica,rolex watch,cartier watches,rolex submariner,fake rolex,rolex replica watches,replica rolex"
"mulberry outlet"
"air max 90"
"ferragamo outlet"
"christian louboutin outlet"
7.14

Zheng junxai5 said...

zhengjx20160715
louis vuitton outlet online
ralph lauren home
michael kors handbags
adidas superstar
coach factory outlet
coach outlet
longchamp le pliage
gucci outlet
oakley sunglasses wholesale
ray ban sunglasses
michael kors handbags
jordan 3 retro
louis vuitton outlet online
true religion jeans
nike trainers sale
burberry outlet online
cheap jordans
michael kors outlet online
christian louboutin sale clearance
louis vuitton outlet stores
coach outlet store online clearances
replica watches
supra for sale
cheap air jordans
coach outlet
coach outlet
michael kors outlet online
nike running shoes for men
michael kors outlet clearance
michael kors outlet
oakley sunglasses
nike free 5.0
burberry handbags
cheap jordans
louis vuitton handbags
hollister clothing store
louboutin shoes
polo ralph lauren
michael kors outlet clearance

Rudy Lay said...

Super website with a great sharing and amazing stories is ur web.. please keep doing what u do now.. thanks to you.
Togel Online Singapore
Togel Online Hongkong
Bandar Togel Singapore
Bandar Togel
Togel Online Terpercaya
Bandar Togel Online Terpercaya
Togel Online
Agen Togel Online Terpercaya
Agen Togel Online
agen togel
agen togel indonesia
togel sgp
daftar togel online
Togel Online terbesar
bandar Togel Online

Rudy Lay said...

Super website with a great sha and amazing stories is ur web.. please keep doing what u do now.. thanks to you.
Agen Bandarq

Agen Domino99

Domino Online

Agen Poker

Bandar Domino99

Rudy Lay said...

Super website with a great sharing and amazing stories is ur web.. please keep doing what u do now.. thanks to you.
Agen Bandarq

Agen domino

Domino Online

agen Bandarq

Bandar domino99
agen domino online

caiyan said...

ray ban sunglasses
nike store
burberry outlet canada
burberry outlet
canada goose jackets
canada goose jackets
moncler outlet
louboutin
michael kors bags
coach outlet
20161104caiyan

Rudy Lay said...

She told me she just didn’t see herself as a leader and didn’t realize that other people at the school saw her as a leader as well
Togel Online Singapore
Togel Online Hongkong
Bandar Togel Singapore
Bandar Togel
Togel Online Terpercaya
Bandar Togel Online Terpercaya
Togel Online
Agen Togel Online Hanoi
Agen Togel Online
Togel Online Cambodia

Rudy Lay said...

Super website with a great sharing and amazing stories is ur web.. please keep doing what u do now.. thanks to you.
Agen Bandarq
Agen domino
Domino Online
agen Bandarq
Bandar domino99 agen domino online

Kame Hame Ha said...

Thanks for your post! it contains quite a lot of things to learn! it's great that I known this site!

cinemaindo
layarkaca21
DAFTARPOKER
BandarQ
BandarPoker
Bandar Kiu
Agen QQ

Rudy Lay said...

She told me she just didn’t see herself as a leader and didn’t realize that othaer people at the school saw her as a leader as well
Togel Online Singapore
Togel Online Hongkong
Bandar Togel Singapore
Bandar Togel
Togel Online Terpercaya
Bandar Togel Online Terpercaya
Togel Online
Agen Togel Online Hanoi
Agen Togel Online
Togel Online Cambodia

Meiqing Xu said...

ralph lauren outlet online
cheap oakley sunglasses
oakley sunglasses outlet
adidas store
moncler jackets
cheap jerseys wholesale
jimmy choo shoes
louboutin shoes
cheap nfl jerseys
michael kors outlet store
hejxia20161217

chenlina said...

ralph lauren outlet
oakley sunglasses
coach outlet canada
omega watches
sac louis vuitton
gucci outlet
louis vuitton handbags
giuseppe zanotti shoes
adidas yeezy
patriots jerseys
chenlina20170307

alice asd said...

packers jerseys
cleveland browns jerseys
fitflops sale clearance
washington redskins jerseys
cheap jordan shoes
replica rolex
ugg outlet
ralph lauren
nike factory outlet
michael kors outlet clearance

Post a Comment