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Everything posted by kalasinman

  1. Well, this was a EU. manufacturer, but nevermind. I find it interesting that not a single commentator has actually tried this. What does being American have to do with anything?
  2. I do appreciate the opinions. I do find it interesting that the idea of using a Barlow in this way was suggested by a guide scope manufacturer. Has anyone actually tried this?
  3. The instructions say to subtract 20% from min and add 50% to max to start with.
  4. Fair points . I would say that flexure is the most likely candidate as it's mounted in a finder style stalk rather than rings. The greatest strength of the Barlow idea is low capital at risk. I'll most likely go back to the OAG for now, and keep the 50mm for its' intended use as a guider for a 200mm camera lens. Even though the graph looked bad, 15 out of 22 5 minute subs looked good with round stars. Keeping with the flexure idea, I'm not correcting for PE at the moment, although the mount will do non-permanent PEC. Seems like when the PE hits, it's going to be magnified by any flexure.
  5. I appreciate your response, but your terms aren't clear. I am not interested in comparing between the OAG and anything else. I know what it does and does not do quite well. I am only interested in this 50mm scope I have with or without a Barlow, and the net effect on guiding. I have plenty of stars to guide with without the Barlow. My guide cam is quite sensitive. I fail to see, other than from a reduction of FOV, why an increase in FL would give me less stars. If you read the sticky here on SGL about guiding, it is stated that without the Barlow , I am right at the limit of undersampling. That is what I seek to correct.
  6. It is difficult to work with results in pixels as the pixel scale must be figured in order to understand results. This is why I use arc-seconds. Of course there could be many factors contributing to poor guiding. My post, however is addressed specifically to the effect of introducing a #X Barlow into the system as a way of improving guiding.
  7. OK, not happy with the FOV limitations of my OAG, but love the guide accuracy. Tried a 50mm f/3.5 guide scope I recently bought for a wide field rig. Great FOV , but very dodgy guiding. Imaging scope 750mm , guide scope 160mm. So why not 3x Barlow the guide scope? That would bring it near 500mm FL and still be somewhat undersampled, but not extremely so. I considered a 400mm guide scope, but total near $300 with shipping and hardware. It's almost 2.5 k also and the 50 is .5k. 3x Barlow from GSO is $40 plus shipping. Could use the 50mm for both rigs, as I have only one mount. On balance, attractive strategy. Am I missing something?
  8. My grandpa worked in a hardware store and taught me the wonders of paraffin candles. Used on such threads and all kinds of zippers, it's great! Just rub a candle across the threads.
  9. Considering the integration and ISO, I'd say there is much more data there than you are bringing out. I don't know Nebulosity, but after stacking do some stretches. You'll be pleased.-Jack
  10. Today from John, "Yes, the CEM25 is the same as ZEQ25 regarding PEC. The recording does not permanently save. The difference is CEM25 can record PE without autoguiding. I think the PEC for ZEQ25/CEM25 is purposely designed so to differentiate it from iEQ30/Pro." Agreed with your view of the business model, Olly Having never owned a telescope or mount before, or even known anyone, I guess I could have done worse. In retrospect, as problem solving is an effective learning device, I've learned a lot. Many of the problems I've had were not else but my inexperience. A slightly fussy critter, but it does punch above it's weight.
  11. No mention of FOV. I'm playing with medium format lenses adapted. Very flat fields.
  12. Today from John at Ioptron re SDE error Regarding SDE in CEM60-EC, from customer feedback all except one case the new firmware has greatly reduced and in some case eliminated the SDE. We suspect the only exception might have something else other than SDE. For example, his DEC and RA ripple were the same and symmetrical which was not understandable since DEC should be flat when guiding was off. One possibility was the camera was not orthogonal to either axis then the DEC ripple was actually a portion from RA. We have not heard from him after a few months when we suggested him to check the DEC reading on hand controller (if there was DEC ripple when guiding off, it should show on the hand controller).
  13. The QHY9 with superior 2 stage cooling and wheel, would/will be my first CCD when I get the cash. I agree with your FOV thinking. Making mosaics isn't attractive unless there is no other way.
  14. As I'm nowhere near to understanding SDE error, I've decided, as I've been offered the upgrade, what I need and what I don't. I don't need unguided accuracy. I do need sub arc second guided accuracy. Right now I can't record PE, so PEC pretty useless. I need to record PE so I can get rid of it. *note to self.. I probably could be doing this per session now, as I am guiding. I would love to get rid of "over current error" and related burned motors. If the stepper motors contribute to ANY of the above, that would be good.
  15. The last post relative to these issues on CN was from April this year I believe. A new firmware issued in June according to the above history from Ioptron website.
  16. 1 CEM60 Firmware Upgrade History V20140115 Beta Testing (main board) V20140214 Beta Testing (R.A., DEC motor control boards, Hand Controller) V20140423 Initial release (HC, main board, R.A. and DEC boards) V20140526 Firmware upgrade for main board, R.A. and DEC board V20140527 Firmware upgrade for HC  Improvement of EC version guiding  Fixed the bug that may cause mount stopping tracking randomly;  Fixed incorrect moving speed of 1x and 2x;  Fixed the bug that will cause PEC playback not working properl y;  Added multi-language interface of HC, Simplified Chinese added ;  Other improvements. V20140720 Firmware upgrade for main board, R.A. and DEC board V20140721 Firmware upgrade for HC New features: 1. Coordinates auto-saving feature added. If the power is lost by accident while mount is tracking, the mount will restore its coordinates when the power is back. It d oes not work while the mount is slewing. 2. Set Zero Position function added. Now you can manually set t he mount zero position using hand controller. Note: The zero position has t be reset after firmwa re updating, or if the mount losing its power during slewing. 3. GPS will auto refresh every 6 minutes. Improvements:  Greatly optimize the size and speed of hand controller firmwar e.  Number input module of hand controller has been rewritten.  Auto-guiding in both R.A. and DEC axes has been improved.  The algorithm to calculate the position of pole star has been further improved.  The algorithm to calculate the zero position has been improved .  Fixed the error that the mount sometime may slew to an incorre ct position of a star  Fixed the display error after mount parked successfully  Other improvements V20140825 Firmware upgrade for HC, main board, R.A. and DEC bo ard Improvements:  Improved tracking performance of EC model.  Improved guiding performance.  Improved the algorithm of Two Star Polar Alignment.  Using the latest (UCAC4) catalog data for calculating position of Polaris and Sigma Oct.  Optimize the communication protocol.  Fixed a bug of sometimes PEC recording will fail.  Fixed a bug in calculating position of pole star.  Other minor improvements.
  17. When I get word that the upgrade, indeed the mount is actually ready, I''l ask the question to John at Ioptron Tech and post his answer here.
  18. I've been using an OAG and have been ok with the issues that come with that choice, i.e. a very narrow FOV. I recently bought a special lens for a 3x4 degree FOV with my DSLR and decided to get a dual mount rig from ADM so I could mount a 50mm f/3.5 guide scope. While waiting for the ADM part to arrive, I tried using the guide scope with the 150/750 newt instead of the OAG. While I found the huge FOV to provide a wide choice of guide stars, I wasn't impressed with the accuracy of guiding, or the lack of it. With the OAG I can achieve RMS of .5"-.8" with 1.5" only with bad seeing that yields poor images anyway. With the 50mm guide scope 1.5" RMS is typical Not happy with that, as my imaging scale is around 1.3" I reason that a guide scope with a FL greater than the 150mm+ of the guide scope and less than the 750mm with the OAG, could yield enough FOV to yield better selection of guide stars and the narrower FOV than the short guide scope would mean a better guide pixel scale and thus more guiding accuracy. Would the venerable ST80 be what I'm looking for? Low price and weight would be considerations as well. Thanks for any advise.-Jack
  19. As I live in the tropics and regularly image with an uncooled DSLR at 25c, noise has been a concern for me. Until recently I felt condemned to suffer with noise. Now I'm changing my mind. I have a Nikon D5100 which, with the True Dark Point firmware, gives low read noise at any ISO and true RAW DATA. I use guiding with PHD2 and BYN/BYEOS. This combination makes dithering easy. The attached image was made 2 nights ago with 22 x 5 minute subs and ISO 400. Dithering set to every 2nd sub at 15 pixels dither. No dark frames, flat frames or in process noise reduction used. I did use bias frames, however. I think noise levels would be considered acceptable to many. IMO high ambient temps do mot require cooling.
  20. Nikon lens on...Fuji? Canon? Sig doesn't show Nikon camera.
  21. "Real Time" seems to mean that no guiding is required for PEC, but whether results can be recorded isn't clear.
  22. Translated from Chinese website; Extremely quiet central equatorial balanced GOTO weight saving of 60% The use of low -power stepper motor New electronic components from CEM60 's ( ? ) Payload of 27 pounds 12.24kg (ZEQ25 11.4kg) Body weight of 10.4 pounds 4.71kg (ZEQ25 5.3kg) 8408 upgraded version of the manual can use the new commander EC has a real-time version of PEC
  23. I heard today from Ioptron that as soon as next week Ioptron will offer existing ZEQ25GT owners the option of upgrading to the new CEM25. The only change mentioned was to stepper motors from servo motors. I'd love to see more details about this. Stay tuned.
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