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150pds vs evostar 80ed for dso

Nova2000

By Nova2000
in Imaging - Discussion

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Nova2000

Nova2000

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Hi

Just before I place order for my scope I learned about the 150pds.can you'll help me on deciding between these 2 ota? My mount will be a azeq5 so it can handle both ota with additional accessories. Which scope will give me a better, sharp and flat field image with the coma correcter and reducer? I'll be using a dslr unmodded. Weight doesn't matter to me as I travel with my friend in my car. 

Thankyou 

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Bagnaj97

Bagnaj97

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They're both good scopes.

The 80ED will give you a wider field of view, and you won't have to worry about collimation.

The 150pds is faster (f/5 vs f/6.375 for the 80ed with 0.85x reducer) and cheaper, but the longer focal length will make polar alignment+guiding more critical (although 750mm still isn't long)  and you'll have a smaller FoV. You'll also get diffraction spikes with a newtonian - personal preference as to whether this is a good thing or not!

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Adam J

Adam J

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1 minute ago, Nova2000 said:

What about cleaning the lense and mirrors and problems with dust? 

Well

1) I could buy 3 replacement 130PDS for the cost of the ED80.

2) I always keep the cap on the tube and store it withe the mirror at the top so that dist will not settle on it.

3) You can easily removed dust from the mirrors with a air blower.

4) I have had mine exactly a year and I have not had to clean it yet.

Your main issue is dew you will need to make or purchase a dew shield at the every least....but then again you will need a dew heater with the ED80...

You dont have to colimate the ED80. But you do have to deal with some cromatic aberration on an ED Doublet.

I think you have an easier life over all with the ED80 but I know that I get better data in less time from my 130pds than my friend with the same camera gets from his ED80 due to the scope being faster.

If you go to the getting started with imaging forum, there is a huge 130PDS thread. The 150PDS is very very similar.

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sagramore

sagramore

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19 hours ago, Adam J said:

I did chose the 130pds and dont regret it as its so much cheaper than the ed80. Also I like diffraction spikes!

Same here! I feel like the focal length of the 130-PDS is more comparable to the ED80 than the 150-PDS is. Especially if you use the Skywatcher 0.9x coma corrector, bringing the FL to 585 mm. In my (biased) opinion it's a nice focal length. I can fit M31 in it nicely with a crop-sensor DSLR but I can still use the same setup to get a half-decent image of something a lot smaller, like M1 or M57.

 

11 minutes ago, Nova2000 said:

What will give a sharper image? Do I have to colimate every time I take it out? 

I have had a 130-PDS for over a year now and I have collimated it maybe once or twice? It's a small scope and as such it is held together very firmly and can take some gentle knocks. If you're particularly rough with it then you may need to check collimation more often. The other thing to note is that once you learn how to collimate (30 minutes reading online?) it is a simple process that takes 5 minutes in the future. A lot of people worry about collimating more than they should do :) I find it a lot more difficult to align the scope/mount and get the guiding working than I do to collimate, and those problems will be the same with any scope!

 

All in all, I am biased, because I have the 130-PDS and I love it. When I weighed up the cost difference between that and the ED80 (even after you pay for the collimator, coma corrector, etc.) it was a no-brainer for me. I like diffraction spikes, although I understand why others don't. I also really dislike chromatic aberration, which you will get some of with the ED80. Those are both personal preferences though and you might completely disagree!

I highly recommend you consider the 130-PDS rather than the 150-PDS, it's shorter, lighter, and cheaper. And head over to the 130-PDS showcase thread (link below)! There's hundreds (literally, and 48 PAGES of comments) of examples of images from people who are practically professional with extremely expensive cameras, down to complete noobs (my end of the spectrum) with an unmodified DSLR. It can give some amazing results.

 

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MattJenko

MattJenko

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For DSOs exclusively, then newt is pretty difficult to beat in terms of cost benefit. It is slightly more hassle to get running well, in that it is not as plug and play as the ED80, although even that requires a focuser tweak here and there. For a total beginner, I would recommend the ED80 as it allows you to concentrate on all the other stuff you need to work out to get images, for someone who knows a thing or two or who is prepared to put in the effort in, the the newt probably takes it. In reality, you won't go wildly wrong with either, they are both magnificently capable for the money and will both provide years of good service if looked after. I still have my ED80, despite using more specialised kit now, and I plan on repurposing it for solar work etc, so their flexibility is also something to consider. With either scope, the limiting factor in your imaging will not be the optics for years :)

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