Quote:I have written off the ASA DDM mounts for a couple of reasons:
- Payload capacity, DDM60 too little, DDM85 too heavy
ASA DDM60 - 55lbs
ASA DDM85 Basic - 100lbs
ASA DDM85 Standard - 143lbs
ASA DDM85 Premium - 220lbs
- Subpaar machining. Those mounts don’t look they are worth the money.
Subpar? Based upon looks? These mounts are CNC machined and high quality.
- Difficult to operate mechanically. The azimuth adjustment range is too small.
Not sure how much you think you need, but after pointing the mount near polaris, lighting polaris up with the laser, there really isn't much adjustment needed. I think what they offer is overkill. I simply hold up my pinky finger at arms length against polaris on the Kochab side and spot the laser to the other side of my pinky. I find myself polar aligned within 5 to 8 arc minutes every time, then run a sequence plate solving 10-15 stars and my polar alignment is typically less than an arc minute and often within 6 arc seconds if I am really maticulous about centering stars in the crosshairs of the CCD image.
The lack of easy axes locking mechanism makes OTA mounting a royal pain in the …
Using a metric #8 hex tool to tighten a locking bolt is a pain? Seriously? I have no trouble mounting my Astrotech 12" RC all by myself. I find it much easier then setting up a Celestron CPC1100 for mount, especially on a wedge!
- Frequent problems with PID parameters.
This issue is fixed in Autoslew 126.96.36.199. There are now presets depending on the size and weight of your system. Only minor adjustments are needed from the preset. Once you set the values and balance the scope using the wicked cool software balancing system, you save your scope to a profile and forget it. I change scopes and with a click all my settings are spot on.
Many users reported tracking errors after 10 minutes or so of continues tracking (no manual axis movement). ASA has no fix yet.
I am not sure what you mean by "no manual axis movement" but if people are having tracking issues after 10 minutes, then they aren't setting up properly. If you do a good polar alignment (30 minutes) and make a good pointing model (30-45 minutes) then use MLPT for tracking, you can't miss. 20 minute unguided subs are easily attainable even for a beginner like me. The images in my post speak for themselves. For those that need to autoguide, you can do that too, but really, it is unecessary unless you want subs greater than 40 minutes.
- Price is way too high
Too high is relative. By the time you buy any other mount, add all your guiding accessories, you'll spend as much as a DDM60. My images speak for themselves. It's worth every penny!
- Poor customer support.
My experience is different. There is a time zone difference and a language barrier, but when I had an issue with an early model DDM60, I traded up and ASA brought my DDM85 NEAF, used it as a demo and gave me a great discount!
- Shipping the DDM85 to ASA for repairs is very expensive.
You got me here!
Quote:We all have opinions....
6" Baby PowerNewt ES 152mm Achro iOptron iEQ30 QHY12 Lodestar & 50mm Borg guidescope Luck
http://www.astrobin.com/users/orion69/ TS 150 mm APO Triplet, Feather Touch 3.5" focuser, Micro Touch Focusing System CGEM on custom made platform Atik 383L+ mono, Atik filter wheel, Baader LRGBC + narrowband filters SX Lodestar + TSOAG9 Dew-Not heater
Quote:- Price is way too high
Quote:It was a big leap for me, not so much due to the cost, but mostly due to the learning curve. Not only was there a huge learning curve for the mount, but I started from scratch knowing little to nothing about astronomy, astrophotography, mounts, collimation, cameras, filter wheels and most of all, image processing.I kid you not; there were no gradients in my knowledge, just pure green So I find myself, a year and a half later, becoming quite knowledgeable on this mount...and it keeps getting better.
Greenfield, Indiana USA
Deforked 1979 Orange C8, WO 66mm APO, 80mm f/7 refractor, Sears 60mm refractor, 80mm Orion short tube
Meade LX80 IOptron zEQ25
C14 EdgeHD, C11 EdgeHD Zhumell 8" f/6 Newt AP1200GTO, CGEM DX, CG5-ASGT Rob Miller Tri36M tripod Canon Rebel XS, Atik 314L+, DSI pro I,II, QHY5L-II SX 7 FW with Astrodon LRGB, Ha 5nm Hutech OAG5, Rainbow Optics Grating Scorpio Observatory
My astrophotography website
Quote:Are there any differences or advantages between guided and unguided tracking (and vice versa) if mount is correctly polar aligned? Why would I shoot unguided if I can guide (disregarding you don't have to worry about guiding star or seeing)?
Quote:Auto-guiding is actually quite simple to do. Also finding guide-star in OAG is easy with calibrated FOV and planetarium software.
What is perhaps much harder is to maintain delicate and large pointing models and tune a complicated open loop system and hope that un-guided works