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About John78

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  1. Having owned both (well, I still own a 130PDS), the 130PDS is much faster, if you use a SW 0.9x CC much much faster - F4.5 vs F6.37! The 80ED weighs 4.1kg with tube rings vs 4kg for a 130PDS. They are both excellent scopes, the 130P-DS is phenomenal value but trickier to use to begin with, and its trickier to balance on the mount as all the mass is at the focuser end the mirror doesn't provide anywhere near enough counterbalance. So the real differentiators are the price and the great divider of astrophotographers - do you like diffraction spikes or not?
  2. Although this is not UK its Germany I've heard some good reviews from his service. http://www.stathis-firstlight.de/spiegelschleifen/materialeng.htm
  3. Is the finder 50mm? Do you have a coma corrector? Not too far away from you...
  4. Its M51x0.75, but you'll need to adjust up and down in OD until you get a nice fit as FDM type printers are pretty variable in terms of printed dimensions vs cad dimensions, and you need to print at 0.1mm layers or less, it also helps not having complete 360 threads.
  5. I'm fairly experienced with astroeq - I've done a DIY mega2650 one using drv8825, tom's board/ic's using tmc drivers and I looked at the new version with surface mount just as a project. So I can probably answer your questions if you post them.
  6. After somewhat of a hiatus - I appear to be imminently back in the game (soon as dark come back anyway!), I chanced upon a 428EX mono for an unbelievable price so I snapped it up. So I'm considering a 135mm F2 for the FOV, speed and price for predominately narrowband imaging when paired with the 428, the concern is the under sampling - I would assume for best results I'd ideally want a scope in the 400-600mm range? The issue with the longer focal range is the size of the Ha targets! Anyone have any thoughts on the subject?
  7. So CCD binning connects photosites together to make effective bigger pixels, importantly, with the associated read noise and dark current of the single/sensor. CMOS "binning" still samples every pixel as unique and accumulates the value in the a2d and reports it (after its been averaged down to 10bit, this is I hope a software problem to be fixed) I could well be wrong, but I think a binned CCD gives you a 16bit output of n binned pixels BUT at the read noise/dark current etc... of a square root n pixel. However you bin a CMOS image you're just averaging or stretching, if you took the 12 or 14 bit raw image and calculate the bin you don't get the advantage of big pixels, because every pixel in the bin has its errors. So when I say "hardware" I think in the current technologies its absolutely fundamental to how photons are read off a CCD and a CMOS sensor currently. I'm happy to be enlightened though
  8. So isn't the problem software "binning" is fruitless, and that if properly implemented binning on CMOS sensors was implemented at a hardware level you wouldn't have to baffle yourself in math.
  9. I'm fairly sure this is because of MPB's business (selling 2nd hand goods), although they have also recently started accepting paypal might be a part of it too. Paypal have the funds ringfenced on your card already - you've paid, you can't spend that £108 elsewhere currently whilst its reserved. Once MPB dispatch the order and mark it so on Paypal they will have the funds released to them.
  10. Yes its normal. Paypal are effectively escrowing your funds so you can be happy with your purchase from (I assume) MPB photographic before they get paid you need to see the goods.
  11. So if you have a computer equipped with a real serial port you don't need anything special at all to connect a NEQ6 to a computer, no USB serial trickery - you just plug a cable into the PC serial port - they're cheap on a well known auction site, this solves the issue of windows renumbering your serial ports when you don't want it, or the cable coming with a hard set port that's already set to something else on the machine. As others have highlighted if you're still using an SLR then the goto/platesolving in APT is pretty good - whatever your solution you need EQmod and ASCOM installed as that's how astronomy gizmo's talk and play properly across multiple programs, so APT talks to to EQmod to move the mount via the correct ASCOM driver - all a non issue. The handset works fine too - but you have no choice but to use the computer to control the mount for PHD guiding so you might as well use EQmod and plate-solving to perfectly frame your target, its a non-decision. (You dont need EQmod if you are only guiding!) Regarding stellarium or CdC for your planetarium - whilst stellarium looks much prettier, its naff, its a pig to connect and stay connected and needs loads of settings changed to show you what CdC shows you by default and connects first time every time with one click. I personally never got on with APT - so I use astrotortilla for my platesolving - point the mount with CdC, use astrotortilla to confirm the mount is looking in the right position and move it till it is then image with SharpCap.
  12. That's a lot of money for a 3d printed bit of plastic!
  13. Well according to astrodon their 2" unmounted filters are 50.00mm in diameter ??
  14. A thing to note that I didnt realise until earlier when looking at cn, is the thin version of the QHY wheels only take filters that are 5.5mm and smaller in height excluding the threads, my and therefore your baaders are 6mm - so they wont fit without surgery which means you'll need the standard 20mm wheel to get them in unmolested, the 20mm wheel shouldn't cause a back-focus problem with a QHY camera however.
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