SharpStar FAQ

SharpStar2 precision focusing tool for astrophotography by Lonely Speck

All information on this page applies to both SharpStar2 and the original SharpStar design, unless otherwise noted.


Where can I order?

SharpStar is currently only available via the Lonely Speck website.

Order SharpStar2 (our latest design) here. The original SharpStar design has been discontinued but you can find more information about it here.


How do I use the SharpStar?

Check out our short video tutorial about using the SharpStar2 in the field:

The SharpStar2 is shown in the video above. The original SharpStar works the same way.

You can also download a copy of our Quick Start Guide (included with every order).


Why is my SharpStar2 not working? Why is it covered with paper?

If you can’t see any stars (or anything at all) through the SharpStar2, you might still have the factory paper backing applied. Your StarpStar2 may arrive with a layer of paper that protects the SharpStar during the laser manufacturing process and helps protect the surface of the SharpStar during shipping.

sharpstar2-bahtinov-astrophotography-focusing-mask-1 copy

To remove this layer, use your fingernail to gently separate the paper from the SharpStar2 at a corner, then slowly peel the paper away. Gently remove any remnants in a similar fashion. When the paper is completely removed the SharpStar2 should appear clear and transparent, like glass.


I’m having trouble seeing the diffraction spikes in my images.

In order to get the best results from the SharpStar2, there are a few things that may help:

  • Keep the SharpStar2 centered on the filter holder. Depending on the lens, the SharpStar2 may be sensitive to centering. If the SharpStar2 is off center, not all of the diffraction spikes may be visible. Shorter lenses (wide angle lenses) are the most sensitive to centering.
  • Always center a bright target star (or planet) in the frame. The closer the star is to the center of the frame, the better the results.
  • Dark skies make the best results. If the moon is full, contrast in the sky can be diminished and the SharpStar2 may not produce as pronounced of diffraction spikes.
  • If you’re still having trouble, please feel free to contact us.


Which lenses is the SharpStar compatible with?

SharpStar2 Compatibility

SharpStar2 was designed to work on most DSLR and mirrorless system camera lenses.  As with most wide field astrophotography, SharpStar2 will usually show the best results from relatively large-aperture, or “fast” lenses. The shorter the lens, the smaller the diffraction pattern and the more careful you’ll need to be to center your target star in the viewfinder.

See our SharpStar2 lens compatibility chart below:


In general, the lower the f/number and/or longer the focal length of the lens, the better (e.g. it won’t work well on a 10mm f/3.5 but will work well on a 12mm f/2).

Please note that the focal lengths and f/numbers marked on this chart are the ‘true’ focal lengths and f/numbers. Use the numbers marked directly on your lens, NOT the 35mm equivalent. That means that you should NOT multiply focal length by your camera’s crop-factor before checking the chart.

To demonstrate why higher f/numbers aren’t as good, check out the examples below of the diffraction spikes made with the SharpStar2 on a 16mm lens at different f/number settings:

SharpStar2: Example Diffraction Spikes with 16mm Lenssharpstar-f-number-example

As the f/number increases, the size and visibility of the diffraction spike pattern diminishes. The central spike at f/5.6 is still barely visible, bit it’s a little too difficult to see for us to recommend as a focusing aid. Use the SharpStar2 at lower f/numbers for the best results.

Which filter holder(s) do you recommend?

To mount a SharpStar you will need:

  • a square filter holder system compatible with your lens
  • adapter ring compatible with your filter holder system and your lens filter thread diameter

To determine which size filter holder system and which adapter ring you will need, you will need to know your lens’s filter thread diameter. The filter thread diameter is usually marked in millimeters on the front of your lens with a diameter (⌀) symbol like this:


In this example, the lens shown has a filter diameter of 49mm. Depending on your lens’s filter diameter size, we recommend the following systems. In general, pick the system size that’s larger than the thread diameter of your lens and also purchase an adapter ring that matches your lens’s thread diameter.


Will the SharpStar fit a fixed hood lens like the Nikon 14-24mm/2.8 or the Rokinon 14mm/2.8?

A new 150mm size is now available for specific fixed hood lenses. Please see our order page for more information.


Do you ship outside the USA?

Yes, orders for the SharpStar2 can be shipped internationally. Shipping fees vary by country.

Our international orders are shipped via USPS First Class Mail. Shipping speeds vary and may take 2-3 weeks to arrive. Tracking may or may not be available depending on the destination. As the buyer, you are responsible for any import taxes (VAT, etc.), duties, and customs fees that your country may impose at the time of receipt of the shipment. All international shipments are marked on the customs form as “Merchandise” with an accurate description of the value and contents (e.g. “Photographic Filter”) and labeled with the proper six digit HS tariff code for photographic filters: 900220. Please check with your local postal service for status updates on your order once it has left the USA.

For further questions, just ask in the comments below or contact me directly. -Ian

195 Replies to “SharpStar FAQ”

  1. From what I can see, I need a 75mm SharpStar for my Lee Seven5 system mirrorless camera filter holder. However, I do not see this option in the purchase dropdown. Can someone please advise on the correct one to order? Many thanks.

  2. Will the 150mm Starsharp work with a Sigma 14-24mm f2.8? I have a 150mm Benro filter set. It looks like it should work.


    1. Brien, yes, the SharpStar2 should work with a 14-24mm/2.8 just fine. Depending on the camera body, a test shot of 2-5 seconds may be required to see the spikes.

  3. I too wanted to order the 100mm but can’t because they are sold out. How will I know when you actually have more since there is no way to place a back order? Is the only way to keep checking back and trying to repeatedly order until they are in stock?

  4. I want to purchase the 100mm SharpStar but it’s sold out, can you tell me when it will be back in stock?. I’m leaving on holiday on 7-28-2019 and really would like to be taking a SharpStar with me.
    Thank You,

    1. Hi Rick – We’ll be packaging up a new batch this week, and they should be ready to ship to customers the following week, so we should be able to get one to you before your holiday. Thanks for your patience!

    1. I’m interested in the 67 mm version as well. Can you please let me know if you plan to restock soon?

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