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About ZiHao

  • Rank
    Star Forming

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  • Interests
    Stargazing, Physics, Maths, Movies
  • Location
    West Malaysia, Puchong
  1. Thanks. 35 lights and IIRC, 20 flats and no darks were taken. Generally people only take around 30 darks. I think you should try with maybe more/less darks or even without them to stack with your raws to see how much it helps the image.
  2. So I am planning to make a dew heater for my camera len using resistors wired in parallel, then distributing them around the circumference of the lens. Diameter of lens: 65mm Total power output: 6W Power Supply(powerbank): 5V, 2A, 20Ah Resistance for each resistor: 120 Ohm Resistor power rating: 0.25W Power output for each resistor: 0.21W Current drawn: 1.21A Number of resistor required: 29 Will probably insulate the wire with tape, and wrap the resistors in cloth around the lens. Is 6W too much or sufficient for this use? Any suggestions? Thanks.
  3. Hi, Yesterday a partial solar eclipse happened here so I took a few pictures using a DIY solar filter with the provided dust cap. And the center seems to have a blurry circle or reflection. Any idea? I don't remember this happening to the image when I use a full aperture filter which I wasn't using this time, was worried that it may fall off. Thanks.
  4. Shot with SW150/750, ASI120MC and 2x Barlow. Stacked on AutoStakkert!, edited on Registax and PS. Hold your phone away from you, it will look better
  5. Tried it, doesn't work. I selected the ZWO USBST4, the slew buttons just don't work. In PHD2 Manual Guide everything is okay as the option 'On Camera' is available. I guess EQDIRECT cable is necessary then.
  6. I have seen a lot of questions about this topic but didn't get a clear answer. Is there a way that I can dither without guiding using APT and PHD2? I am using ST4 cable now and mounting a DSLR + kit lens on my EQ3 Pro to do normal sidereal tracking (maybe dithering is redundant at short focal length, say 24mm?) Will disabling the RA and DEC corrections in PHD2 still allow dithering? Because I don't need guiding for the widefield setup and not planning to mount the guidescope on top either. Thanks in advance.
  7. Stars seem to 'travel' faster on the celestial equator than the stars situated at the poles. Why is this? Is this just a perspective problem?
  8. I think if you want to avoid light pollution, travel to Mersing which I believe is close to your location.
  9. Anyone done astrophotography with this guidescope? Sounds like a stupid idea, but being limited on budget, I was hoping to mount this on my EQ3 pro instead of the heavy Newtonian reflector. It costs only 120 dollars, a really cheap refractor. What do you think?
  10. I am using a DSLR and only takes bias frames and flat frames but no darks as the temperature I believe doesn't match. I heard that if you already have bias frames or when the flats are of short exposures, you don't need dark flats. But IMO, usually dark flats aren't necessary. What do you think?
  11. Thanks for suggesting! I will try that later.
  12. Thanks! Skywatcher 150p with ASI120MC and 2x Barlow.
  13. Stacked on AutoStakkert! and sharpened on Registax and PS. I wish I have access to a longer focal length to photograph this wonderful planet.
  14. Ah, I think I misunderstood the term "faster" here, I related it to the light gathering ability of the camera, light gathering ability as in like, for example, we have one deep sky object that both the sensor can capture completely, now we crop it to the same size so both images show the same features of the DSO, so the SNR for both of them will be the same, therefore for different sensor size using the same focal ratio scope, how fast they collect light is the same. I agree the larger sensor covers wider FOV whereas smaller sensor covers smaller FOV and larger sensor is faster, in another way, that they will cover bigger area of the sky and the total light collected will be greater. Thanks for clarifying, I hope that I didn't confuse myself again.
  15. Using the same scope but with two different sensors size, why would the combination with bigger sensor be faster when they have the same focal ratio? Please correct me if I misunderstood this.
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