These products are sold at www.solarscope.com. The devices project the image of a slightly magnified sun onto a screen within a box, shaded from excess interfering light.
There are four editions, with the price ranging from $89 to $249. The one that I really wanted was the "traveler's edition" which can break down into a smaller package for transport - but I did not think I needed to spend the $249 on this edition. I wanted something more durable than the less expensive ones, so I bought the "wooden edition" for $189.
As expected, it came shipped in a flat box and assembly was required.
The instructions could have been written with greater clarity. Instead of making separate assembly instructions for each product, they are combined so that the reader has to be attentive as to whether a particular step applies to the Traveler or the Wooden Edition.
The instructions are also incomplete. On the last page, Step 14 refers the reader to Step 5 in the Instruction Manual, and Step 10 refers to Step 15 in the Instruction Manual. What is missing is any reference to completing the project are references to Steps 16, 17 and 18 of the Instruction Manual. It is not difficult to figure out how to complete the project, but it was disconcerting since one of these steps says, "Caution, once the screw cap is fastened, the lens cannot be dismantled!"
The terminology in the instructions are also inconsistent. The instructions refers the reader to "The Instruction Manual," but among the documents, there is no such document. The document in question is actually entitled "User's Guide." The parts are also inconsistently labeled. In the parts list there is a "lens tube" but in the text it is simply referred to as "tube."
The instructions are not specific and each step must be carefully thought out during construction. One of the panels is white on one side and tan on the other. The instructions do not state this, but the white needs to face in, not out, in the construction.
Extra care should be taken in placing the panels into the grooves on the sides.
You'll need a hammer to gently tap the panels into place.
Be sure to check the intersection of the panels and sides to be sure there are no gaps, as is the case above. This is easily corrected if done before the glue dries.
This tube-like stopper secures the mirror in place. The problem is - which direction to insert it?
On one side it is solid, and the other side it is hollow. My suggestion is to have the solid end opposite from the mirror. That way it is easier to press the stopper all the way against the mirror, as I did with a screwdriver head as seen below.
Focusing is easy, but I did find one problem here. I found was that there was too much play in the lens tube to suit me. Maintaining focus was not easy because the tube tended to slide on its own. To resolve this problem, I took some parts I found in my garage. I took a plastic ring that was wider than the tube, drilled a hole in the side, and used a wing screw to build a device to secure the lens tube in place.
Don't expect the image of the Sun to be very large. There is not much magnification power in the Solarscope. It is sufficient to see the sunspots, but not enough to see detail of the spots. It is perfect for eclipse viewing. I am confident that it will be sufficient to see a transit of Venus. I am not sure that it would be sufficient for a transit of Mercury - but this statement is purely speculation. The solarscope's web page says it is good for viewing transits of the smaller planet, so I would assume that is true - but for me the jury will be out on this one until 2016, when I hope to next see a Mercury transit.
It will be excellent for use with school groups, and I look forward to the next time I spend a day at my wife's school with her students.
All in all, I rate this product very highly. I would like to see them work on securing the focusing system, and would definitely like to see them revise their assembly instructions. All in all, well worth the money.