What is Reddit's opinion of Celestron 21024-ACC FirstScope Accessory Kit (Black)?

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Here you go. Celestron 21024-ACC FirstScope Accessory Kit (Black) https://www.amazon.com/dp/B008EGQBRI/ref=cm_sw_r_cp_api_i_eu6yFb22B37H8

Yes :-)

The 6mm is cheap, will provide you 150x, which will work even if atmospheric seeing isn't excellent (which it rarely is).

The 4mm would provide you 225x which can still work with a 130/900. But only if seeing is excellent, and the optics are good. The image will already get dim.

A 130mm telescope is often quoted to have a maximum magnification of 260x, but that won't work well (It's an often quoted rule of thumb: Two times the aperture in milimeters, or 50 times the aperture -> resulting in 0.5mm exit pupil, but that already produces a dim image and won't gain detail. It's better to stick under 200x.) It may seem desireable to magnify higher but things just get dull. (http://blog.pixelgiraffe.com/wp-content/uploads/2020/07/5MagnificationSaturn-crop.png)

> 66°

You can modify the 66° eyepieces btw if you like to tinker. They can be unscrewed and basically have a barlow element in the bottom. By adding a spacer between these you can change the 6mm a bit, e.g. down to an effective focal length of 4mm. (http://blog.pixelgiraffe.com/?p=820)

 

> finder

You can get those finders for under $10 via eBay/China, Aliexpress, a bit more locally, and around ~$20 as kit via Amazon. They should fit, but ideally measure and perhaps search for dimensions / ask people with that telescope / kit what the distances are.

Those kits are horrible (https://www.amazon.com/Celestron-21024-ACC-FirstScope-Accessory-Black/dp/B008EGQBRI/). Don't let yourself be fooled, the 6mm eyepiece is one of the simplest designs you can get and nothing like the 6mm 66°.

• (Bottom of the barrel examples, not a direct recommendation, random links, check seller ratings and shipping times),

  • (tiny cheap finder https://www.ebay.com/itm/5x24-Finderscope-Bracket-Plastic-Accessory-Kit-for-Astronomy-Telescope-brand-new/184413238794 )
  • (red dot https://www.ebay.com/itm/Red-Dot-Telescope-Viewfinder-Finder-with-Fixed-Base-Bracket-Ruby-Coated-Lens/232924400541 but with tinted plastic not ideal for night time!)

Those small finders are pretty poor, but what you get with most telescopes. A red dot finder of decent quality is better than a 24mm finder IMHO though, but I'd get a bit better one.

There was an ebay seller selling a 6x30 right angle finder, but they seem to be out of stock, https://www.ebay.com/itm/6x30mm-Crosshair-Erect-Image-Right-Angle-Telescope-Finderscope-Bracket-BLUE-/333755416650 You can still find them on Aliexpress and such, and a 6x30 is much better than the cheap ones of telescope kits, but locally they cost more than what they're worth IMHO.

 

USA: Also check out surplusshed, e.g

https://www.surplusshed.com/pages/item/M2819.html

https://www.surplusshed.com/pages/item/T1676.html

(https://www.surplusshed.com/pages/item/T1656.html)