Thinking About a New Scope? Think Big!
Ordering
M57. Taken with 25" f/5 Obsession, ServoCAT drive, MallinCam Pro video camera.
Chris Anderson in Eddyville, Kentucky receives his 22"UC
Need more help/info?
Send us an email. We can help with choosing the aperture, model, accessories, delivery dates, and special requests.
ORDERING INFO
(US and Canadian customers)
Ordering is easy.
Deposit required to place order.
- $1500 for 12.5”
- $1600 for 15”
- $2000 for 18”
- $2000 for 20”
- $2200 for 22”
Please send a check for the required deposit to:
OBSESSION TELESCOPES
PO BOX 804
LAKE MILLS, WI 53551
Please include your name, phone number, shipping address, email address, and a list of options/accessories you want with your scope.
Or send us an email with above info and drop the deposit check in the mail.
After we receive your deposit, we will send a hard copy confirmation letter by Post.
ORDERING INFO
(Overseas customers)
Please send us an email for ordering instructions.
Comparisons |
Typical 8" |
12.5" |
15" |
18" |
20" |
22" |
25" |
|---|---|---|---|---|---|---|---|
| Light gathering power over typical 8" Schmidt-Cassegrain | - | 2.5X | 4X | 5X | 6X | 7.6X | 10X |
| Limiting stellar magnitude: | 14.0 | 15.0 | 15.5 | 16.0 | 16.5 | 16.7 | 17 |
| Rayleigh Resolution Limit: | 0.68 arc seconds |
0.38 arc seconds |
0.36 arc seconds |
0.31 arc seconds |
0.27 arc seconds |
0.25 arc seconds |
0.22 arc seconds |
| Contrast Limit: (minimum diameter before a nebular object fades from view) |
11 arc minutes |
6.0 arc minutes |
5.7 arc minutes |
4.8 arc minutes |
4.3 arc minutes |
4.0 arc minutes |
3.4 arc minutes |
