Does it come with instructions for attaching it?

No, but i can help a little bit. This objective is known as a finite objective so you'll have to position it 160mm from the camera sensor. The other type of objective is a infinite objective which requires a 200mm lens to focus known as a tube lens. You'll need an RMS adapter, mine is a RMS to M42 for example lots on ebay. Then you'll need an M42 to whatever your camera mount is. You'll need some kind of extension tubes to around 160mm between the objective and the cameras sensor. Theres probably a little line on the camera body somewhere to show that Theres lots more info about this kind of thing here: http://extreme-macro.co.uk/

Does the objective lens come with a container for it?

Yes a normal objective plastic threaded sleeve

Can I lower the magnification to 2 times rather than 4 or would I need to buy a different lens for that?

Yes you can. You need to shorten the overall distance from lens to sensor but yes you can. A set of bellows really helps with this.

Will this fit an old b&l dynazoom. i want to lessen the magnification from the 10x to 4x?

Look at your 10x lens. To fit three things should match: the optical design must match - if you see an infinity symbol on your 10x lens -- the lens do NOT match. Next the the focal length must match, if you see 170/ on you 10x lens - your microscope is RMS, it can work - but requires an adapter - not worth it . If ups see 160/ it is OK, and also the third thing - the thread - most likely will match as well.

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4X Plan Achromatic Objective Lens with Knurled Ring

Product ID: 36936874

Details

Brand
AmScope
Color
Gold Grey
Light Source Type
LED
Magnification Maximum
4 x
Material
Glass
Number of Items
1

🎯Plan achromatic color correction

🔬4X magnification precision

⚙️160mm DIN standard tube length

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Description

🔬 Elevate your microscopy game with flawless 4X clarity!

TRUSTED PERFORMANCE - Top 10 bestseller with 4.4-star rating—join the pros who demand quality.
CRYSTAL CLEAR CLARITY - Achromatic lens eliminates color fringing for razor-sharp images.
PRECISION ENGINEERING - Knurled ring for easy, secure adjustments without slipping.
TRUE TO SCALE VIEWING - Plan field correction ensures edge-to-edge focus across your sample.
SEAMLESS COMPATIBILITY - Fits all standard DIN/JIS compound microscopes with 160mm tube length.

This 4X Plan Achromatic Objective Lens offers precise 4X magnification with achromatic color correction and plan field correction, designed to fit standard 160mm DIN/JIS compound microscopes. Featuring a knurled ring for easy handling, it delivers sharp, distortion-free images ideal for professional and academic use.

Specifications

ASIN	B01G4CCGRC
Best Sellers Rank	#9 in Microscope Lenses
Brand	AmScope
Color	Gold, Grey
Customer Reviews	4.4 4.4 out of 5 stars (114)
Enclosure Material	Glass
Light Source Type	LED
Magnification Maximum	4 x
Manufacturer	United Scope, LLC
Manufacturer Part Number	PA4XK-V300
Model Number	PA4XK-V300
Objective Lens Description	Achromatic
Power Source	Battery Powered
Real Angle Of View	45 Degrees
UPC	840979106385
Unit Count	1.0 Count

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