I had my camera out at the observing shack the other day and took a few pics to pass along. This is further to my last message about mounting accessories on telescopes and telescope mounts. Its a bit of a jungle as there is no standardization in the industry not to mention the overlap between telescopes and cameras. Here is my blow
by blow description of the photos which are all numbered and are low res so as not to take up any valuable space on your computers hard drive. This info would be helpful to anyone wanting to attach accessories to there mount or telescope.
1, 2 and 3 all show the astro tech dovetail adapter and how its screw holes match up to the PST solar telescope which is popular with club members. If you have an equatorial mount its real nice to be able to just clamp the PST on for some daytime solar observing and enjoy the advantage of having tracking via the EQ mount. The mounting bar on the telescope is a “Vixen” style bar as opposed to the “Losmandy D” style bar which is much more substantial but usually much heavier and expensive. As you can see in the photo you can slide the PST solar scope anywhere along the bar for balance and viewing comfort.
4 and 5 show a dual mode dovetail adapter that fits both the Vixen style and the Losmandy D style dovetails. The advantages here are obvious in that you can attach this to either size of bar. As for the holes lining up with the PST on this adapter, I have not checked it.
6 and 7 show a camera mount used for piggy back shots while mounted on the back of a telescope. I attach this camera mount, to the dual mode adapter seen in the previous photo, and take short time exposures with my DSLR ( digital single lens reflex camera). Pic 7 shows where I had to add a threaded insert into the base of the camera mount so that it would mate with the bolts used in the dovetail adapter… another example of lack of standardization. I might have some more of these around the shop if anyone finds themselves in a similar situation.
8 shows the camera mount and dovetail adapter mounted on my scopes “Losmandy D” style dovetail. Using your telescopes dovetail can save you adding another dovetail to your tube assembly.
9 shows 2 things. Of interest to every observer is the dew strap that you can see wrapped around the eyepiece. You can buy these for a reasonable cost and run them off a battery. Think how nice it would be to be able to walk away from your scope for five minutes and find your eyepiece unaffected by dewing when you return.
2nd thing here is the focuser that I have attached to the back of my C11 (celestron 11″ tube assembly). This really is only of interest to members who have a similar style of telescope ie Schmidt Cassegrain… did I spell that right? My spell checker says not. The advantage here is that by using an auxiliary focuser you avoid the inevitable mirror shift that plagues this design. Also you have the advantage of having a 2 speed focuser and the slow speed focus works real nice on a solidly mounted scope. The disadvantage here is that you cant use a focal reducer for visual use, only for imaging.
I hope this helps some of you looking to accessorize your scopes and mounts.
Let me know if any questions!
Sunshine Coast Centre RASC member