What is the sequence of placing Barrow Lens, Eye Piece and the Filters in the telescope( physically)? Is combining multiple filters useful? I own NexStar 130.

Filters attach to the eyepiece. But there are differences in placement of the Barlow depending upon length. However, that isn't pertinent to the NexStar 130. If you were to use a Refractor, for example, a long Barlow would be placed between the Focuser and the Star Diagonal. A short Barlow would be placed between Star Diagonal and eyepiece. But for your situation, the color filter is attached to eyepiece at the bottom (eyepieces generally have internal threads where the filter can be screwed into place using a gentle twisting motion; finger-tight only, do not overtighten) and the assembled eyepiece/filter inserted into the short Barlow. None of my Barlows have such threads at the bottom that I have noticed, but your situation may vary. But yes, you can combine filters of some colors and types. For example, combining a polarization filter with a color filter can be used to reduce glare and bring out detail. Experiment to find what works best for your current situation in accordance with the object to be observed. But this stacking of filters only will work for filters with both sides threaded for the purpose.

Say, for what models of telescopes is this kit fits? I have celestron astromaster 130

These are 1.25 inch eyepiece and filters. They fit the smaller modern scopes with 1.25" focusers, and also work in the larger 2 inch focusers if you have the 2" to 1.25" step down adapter. The smaller 6 and 8mm eyepieces are difficult to use for people with eyeglasses, they have short eye-relief (meaning you have to get your eye very close to the lens to see the entire field of view); Using the 2X Barlow on the larger lenses helps them magnify more, while retaining better eye-relief. This kit is a good value for the money, but if you become serious about this hobby, you will be adding higher end eyepieces to this starter set.

Hi can use for Celestron 31036 AstroMaster

if the Celestron 31036 AstroMaster takes a 1.25 inch eyepiece it should work.

is there any piece included in this kit to look at the sun?

I purchased a sun filter that fits on the front end of the telescope. it is like very fragile aluminum foil - and it worked great... the sun becomes an orange ball and it worked great for eclipse and also you can see sun spots... NEVER LOOK AT THE SUN THROUGH YOUR SCOPE WITHOUT A GOOD QUALITY SUN FILTER...DON'T TAKE SHORT CUTS OR CHEAP 'TRICKS' TO VIEW THE SUN. The part I used is a Celestron Model #94162 Astro Solar Filter 8"... good luck.

ASIN	B00006RH5I
Best Sellers Rank	#2 in Telescope Filters
Brand	Celestron
Built-In Media	6mm, 8mm, 13mm, 17mm, and 32mm Plossl Eyepieces, 2x
Coating	Fully Multi-Coated
Compatible Devices	Most telescopes
Customer Reviews	4.7 out of 5 stars 3,152 Reviews
Eye Piece Lens Description	Plossl
Field Of View	52 Degrees
Focal Length Description	64mm
Global Trade Identification Number	00050234943031, 00768421126760
Item Dimensions D x W x H	13"D x 11"W x 5"H
Item Weight	0.5 Pounds
Manufacturer	Celestron
Model Name	Eyepiece and Filter Kit - 1.25"
Objective Lens Diameter	32 Millimeters
Product Dimensions	13"D x 11"W x 5"H
UPC	050234943031 768421126760
Unit Count	1.0 Count
Warranty Description	2-YEAR WARRANTY
Zoom Ratio	Variable

Celestron Accessory Kit with Five 1.25" Plossl Eyepieces, 2x Barlow and Filter Set

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