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KEJ

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Everything posted by KEJ

  1. Thanks and I have never heard of that/him before.
  2. This was more of a test last night, but with the 6.3 Reducer at 105mm or 107mm to the join, I had a FL of 1304mm when it plate solved(info in App and FITs header file), which I believe equates to the Reducer working at 6.4 which is possibly the best I'm going to get. Meade 2034mm FL 1304/2034 = 0.641 Sunflower Galaxy M63 Approx 27 million LY away and 100,000 LY wide. Not the best image as I only managed about 50mins of data last night and a fair amount of fringing on the stars(just can't get the staff). Captured using Meade 8" SCT with a 6.3 Reducer with a FL of 1304mm. ASI533 MC Pro, guided with the help of the ASIAIR. Bortle 6.
  3. Managed to get a small break in the cloud. Steel ruler, 6.3 Reducer and A4 paper in hand, I took an approx measurement of 220mm FL, which I think equates to mine having or requiring a BF of 105mm or 107mm approx to the join between the Reducer and T-Adapter. Optical train should now be set and hopefully clear skies tonight. Thanks again for everyones comments and advice.
  4. Brilliant and thanks once again. I will bring everything down and alter once again....... Job completed and now the wait for the weather......
  5. Thank you also for the prompt reply and info. I have never tried the Sun trick and whilst the 105mm figure is mentioned, I was exactly unsure up to exactly where as previoulsy I had always measured to B from the camera sensor. So I guess all my various tests were pretty much 10-12mm out all the time. Thanks
  6. Stuart hi Thanks for the prompt reply and info. 6.3 Reducer Is it safe to say the join, where the T-Adapter meets the Reducer or just step back into the T-Adapter collar a few mm ? I will have to take it apart to check. 3.3 Reducer I had a 15mm and 30mm tube/spacer that came with the adapter. I still assumed I would have to make allowances for the camera as I again assumed the older camera sensors could have been closer etc - fair point. Thank you
  7. Not sure if anyone out there can give me a definitive answer on three hopefully simple questions. Background I have a Meade 8” SCT F10, ASI533 MC Pro camera and Hirsch 6.3 Reducer – see the attached. Q1) Back Focus Distance Does anyone know the correct back focus(BF) for this setup as I have heard values from mentioned from 85mm, 88mm, 105mm and 115mm, when measuring from the camera sensor to the Reducer? Q2) Measure to Where When measuring, the camera end is simple as I know from the sensor “C” to the top of the camera spacer “D” is 17.5mm. Should the measurement at the Reducer end be to point “A” or “B” on the T-Adapter ? Example Take the 105mm or 115mm BF figure I have used, now depending how you measure, to point “A” or “B” then that could be the approx. correct distance. Q3) Meade 3.3 Reducer In addition, I have a Meade 3.3 Reducer and once I know the correct point to take the measurement at the T-Adapter end is, does anyone know the BF distance for that potential setup as well ? (With the 3.3 Reducer I could also possibly try it with one of my planetary cameras which have smaller sensors & more out of interest). Hopefully thanks
  8. You could be right........Its just that I have one and I was determined to try and get it to work. Parked up for the moment......
  9. Mine will be going down a black hole if I can't sort it out. I'm parking the 3.3 issue for the moment, so back on the WO Z61 and maybe a crack at Venus/Moon with the Meade over the next few nights if its clear.
  10. Thank you, yes I agree on that. I have been using picture as well previously.
  11. Blimey, thats interesting and I would have never in a month of Sundays figured that out. - thank you. So looking from above at the optical train, where the crack/join/seam is between the T-Adapter and Reducer? Your red line on the right hand side is say on the threads of the Reducer?
  12. Thank you......I did read that previously. But I'm still trying with the 533 and that was going to be a try fallback with my planetary camera.
  13. Once I know where to measure from, which I do now........I can at least concentrate on the getting the spacing correct.
  14. Thanks for the prompt reply. I have a 6.3 reducer and I find 105mm BF is perfect(well with my dodgy eyes). However, with the 3.3 Reducer I hear or read so many conflicting comments, so I have with the bad weather been trying to grab the odd picture and relying on the star patterns until I get a definitive answer. Currently the outer stars are all slightly radiating outward, which I believe suggests the gap was too small. Hence why, I was just going to try 58mm approach later. Question Whilst you have answered my question(thank you) the glass or last lens of the Reducer I assumed sticks out slightly more, thats why I was possibly confused, but I will take your advice. And just to be clear, on my picture on the Reducer, I have the raised band/collar where it has Meade printed on it, to the left is the crack/join where the reducer meets the T-Adapter, that is where I believe the tread would be if they were separated/unscrewed, if that makes sense ? Thank you
  15. Back now and thank you, hopefully I'll remember.
  16. A question regarding back focus(BF) when using a 3.3 Reducer and any comments or advice would be appreciated. So last night I was intending on trying the 58mm approach as the BF distance, unfortunately it was way too cloudy, so that test is on hold. In the meantime and regarding measuring, if you see the attached picture of my ASI533 and the distance between 1 - 2 = 17.5mm (sensor to top camera spacer). Questions When measuring or calculating distance and allowing for the 17.5mm (sensor to top of the camera spacer), should I measure to the Green, Yellow or Red lines/indicators I have added? Example Whilst this pictures probably show one of my earlier tests, let’s say the gap between the camera spacer and the T-Adapter was approx 10mm at thats the spacers I am using. Therefore, camera sensor to Green line could be 17.5 + 10 = 27.5mm To the Yellow, could be 17.5 + 10 + 10 = 37.5 To the Red, could be 17.5 + 10 + 10 + 5 = 42.5 I am always slightly unsure where I should be measuring to exactly at the T-Adapter end ? People say to the last glass lens of the Reducer(camera end) so I tend to guess and with the 3.3 you have to be more precise. Thanks in advance * where the spacer is closest to the T-Adapter, there is a tiny few mm collar, should I be allowing for that as well ? ** Or Actually, should I be measuring inside the T-Adapter to where the tread ends inside the tube? Sorry for all the questions and any comments much appreciated, I cut and pasted, the text has gone weird .......have to pop out will try to edit later
  17. I tried using Siril and added about 500 pics.......still haven't got it weighed off for adding FLATs mind....
  18. I grabbed a few more images the night before last.....next I will try to incorporate them with my others
  19. Or your not going outside again tonight!!!!!!!
  20. The Moon has other plans for the next week or so.....
  21. It's great when everyone has a go at the same target
  22. Very true.......I'm hoping to grab a few more subs tonight as well.......slight cloud here though at the minute.
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