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Help Me Chose a Mount for Deep Sky Astrophotography

Astrophotography Beginner CCD DSLR DSO Imaging Tripod
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9 replies to this topic

#1 Mikichuha

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Posted 21 February 2024 - 07:58 AM

I use a Canon EOS 500D with 400mm lens. SInce my camera is crop sensor ot gives me 640mm of total focal length.

I was planning to build a starter setup so I was planning to buy an iOptron Skyguider Pro or a SkyWatcher SkyAdventurer (I already have a tripod to mount them)

Firstly, pls tell me if these will be good enough and which one is better.

My budget is 450 GBP so if there is any other mount you think is suitable, please let me know!

 

Thanks.



#2 Tapio

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Posted 21 February 2024 - 08:10 AM

Is your lens the f/5.6 version?

 

To make life little easier I recommend this:

https://www.firstlig...nturer-gti.html

 

Easier to find your targets (other than the brighter easier one).

PS 400mm focal length is 400mm no matter what sensor you put behind it...



#3 Mikichuha

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Posted 21 February 2024 - 10:16 AM

Yes, I think this looks nice. Thanks for the recommendation

I have a 18-400mm lens with f5.6 - 6.3 (depending on focal length)

Another question I had was that if I live in a city sky, let's say bortle 7 or 8, what is the largest exposure time I can get on the tracker without image getting overexposed?

#4 vidrazor

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Posted 21 February 2024 - 10:27 AM

Yeah the Star Adventurer GTi kit with the tripod and pier extension is a better choice over the Star Adventurer or SkyGuider Pro.


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#5 Spaceman 56

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Posted 23 February 2024 - 11:17 PM

Another question I had was that if I live in a city sky, let's say bortle 7 or 8, what is the largest exposure time I can get on the tracker without image getting overexposed?

its going to be short, and will depend on your ISO choice.

 

lower ISO will make longer exposures possible. Higher ISO will clip earlier.



#6 Mikichuha

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Posted 24 February 2024 - 03:01 AM

But how long? If I use low iso, such as 400 or 200, what can be the max exposure time?

#7 Tapio

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Posted 24 February 2024 - 03:07 AM

We can't say because we don't know your conditions.
ISO 400 and 30 seconds might be a good starting point.
Try this and see how your histogram looks like.

#8 vidrazor

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Posted 24 February 2024 - 08:43 AM

But how long? If I use low iso, such as 400 or 200, what can be the max exposure time?

Strangely I could not find data on your camera's sensor, only models around it. Generally speaking, ISO 1600 is the sweet spot for the older Canon bodies. ISO 800 would be the lowest to use.

For sub times, aim for an exposure that will give you a histogram around the 1/3 mark from the left on the back of your camera. In high Bortle skies, you need to shoot a lot of subs.



#9 mmalik

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Posted 24 February 2024 - 08:52 AM

Help Me Chose a Mount for Deep Sky Astrophotography...

 

Here... and Here.... Regards

 

 

.



#10 Spaceman 56

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Posted 27 February 2024 - 04:18 AM

But how long? If I use low iso, such as 400 or 200, what can be the max exposure time?

People please forgive me for attempting to answering this.

 

you can expose as long as you want. there is no law against it.  smile.gif

 

However very long exposures will potentially overexpose the image, and it will be ruined.

the light pollution in your location will define how long it takes to do this.

 

also the F Ratio of your lens determines how much light is getting in to the camera sensor.

 

I have shot at ISO-400 with my Nikon and had no difficulty taking 30 second exposure through a 448mm F5.6 Optical system.

 

to get good images, without star trails, I had to use an Equatorial mount, called a Skywatcher AZ/EQ5 Pro.

 

I hope that helps. Spaceman




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