Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

sgl_imaging_challenge_banner_30_second_exp_2_winners.thumb.jpg.b5430b40547c40d344fd4493776ab99f.jpg

Recommended Posts

Im undecided on wether to go for an ED 80/100 or PDS

not too bother for visual as I have a 10" dob which I will be mounting on an EQ6

Thoughts please

Edited by Frank the Troll

Share this post


Link to post
Share on other sites
27 minutes ago, Frank the Troll said:

Im undecided on wether to go for an ED 80/100 or PDS

not too bother for visual as I have a 10" dob which I will be mounting on an EQ6

Thoughs please

Do u mean 130pds?

Share this post


Link to post
Share on other sites
6 minutes ago, Fieldsy said:

Do u mean 130pds?

200mm PDS I have a few unexpected pennies

 

Edited by Frank the Troll

Share this post


Link to post
Share on other sites
4 minutes ago, Frank the Troll said:

200mm PDS I hava a few unxpected pennies

 

Thats a completely different focal length to a 80/100 ED so what do you want to do with your new scope?

Share this post


Link to post
Share on other sites
1 minute ago, Adam J said:

Thats a completely different focal length to a 80/100 ED so what do you want to do with your new scope?

Dipping my toe into astrphotography

Share this post


Link to post
Share on other sites
14 minutes ago, Frank the Troll said:

Dipping my toe into astrphotography

If you are just starting then a ED80 / 70 or a 130PDS are your best choices.

Share this post


Link to post
Share on other sites

To spike or not to spike, some aren't bothered some love some dislike, does it boil down to that for you.

Share this post


Link to post
Share on other sites
9 minutes ago, happy-kat said:

To spike or not to spike, some aren't bothered some love some dislike, does it boil down to that for you.

In English please

 

Share this post


Link to post
Share on other sites

The reflectors naturally give refraction spikes on bright stars, refractors don't as there's no secondary mirror supports.

Edited by happy-kat

Share this post


Link to post
Share on other sites
5 minutes ago, happy-kat said:

The reflectors naturally give refraction spikes on bright stars, refractors don't as there's no secondary mirror supports.

Im more inclined  too refractors as a preference

Share this post


Link to post
Share on other sites

Why not look at images on the same target and see what you prefer. Say M45 nice bright object taken using the kit you are thinking of.

Share this post


Link to post
Share on other sites
28 minutes ago, happy-kat said:

To spike or not to spike, some aren't bothered some love some dislike, does it boil down to that for you.

And some people image using some stunningly sharp refractors, and then for some inexplicable reason, add diffraction spikes to the stars????? :icon_scratch: There's nowt as funny as folk!

  • Like 2

Share this post


Link to post
Share on other sites
23 minutes ago, mikeDnight said:

And some people image using some stunningly sharp refractors, and then for some inexplicable reason, add diffraction spikes to the stars????? :icon_scratch: There's nowt as funny as folk!

Not only that - such spikes are unmistakably artificial and out of place!

1 hour ago, Frank the Troll said:

Dipping my toe into astrphotography

 

30 minutes ago, Frank the Troll said:

Im more inclined  too refractors as a preference

There is very tempting offer now with TS, show room samples of 115mm triplet scopes at very good price. Some people frown on these as they are FPL-51 triplets but people that own them say they are very good scopes (at least that is what I've read they say).

https://www.teleskop-express.de/shop/product_info.php/info/p11871_NEU--TS-Optics-PHOTOLINE-115-mm-f-7-Triplet-Apo---2-5--RAP-focuser.html

Pair that with FF/FR and you will get very respectable medium focal length - good for all sorts of imaging. In fact, paired with x0.75 Riccardi FF/FR - that scope gives 600mm which is right there with 80ED and 130PDS in terms of focal length, but aperture wise it is in 130PDS class and it is still refractor - so easy to work with for imaging.

  • Like 2

Share this post


Link to post
Share on other sites

Im not an imager Frank and have no real in depth understanding of the for's and against's from an imagers point of view. All I really know is that ED apo's produce some of the most amazing images. They also make amazing visual instruments too, so that when you can't be bothered lugging a big scope around in the freezing cold of winter, or you just fancy a quick ten minutes visual observing before bed, the ED will give you a great time with very memorable views.

  • Like 1

Share this post


Link to post
Share on other sites
11 minutes ago, vlaiv said:

Not only that - such spikes are unmistakably artificial and out of place!

 

There is very tempting offer now with TS, show room samples of 115mm triplet scopes at very good price. Some people frown on these as they are FPL-51 triplets but people that own them say they are very good scopes (at least that is what I've read they say).

https://www.teleskop-express.de/shop/product_info.php/info/p11871_NEU--TS-Optics-PHOTOLINE-115-mm-f-7-Triplet-Apo---2-5--RAP-focuser.html

Pair that with FF/FR and you will get very respectable medium focal length - good for all sorts of imaging. In fact, paired with x0.75 Riccardi FF/FR - that scope gives 600mm which is right there with 80ED and 130PDS in terms of focal length, but aperture wise it is in 130PDS class and it is still refractor - so easy to work with for imaging.

Only way to add spikes to a refractor is to make a mask and do it properly. I personally think it adds something to open clusters, but spikes added in processing do look rubbish.

Share this post


Link to post
Share on other sites
38 minutes ago, Frank the Troll said:

I don't think you want those scopes for imaging - unless you are very tight on budget, really want to get 4" and are OK with some purple fringing.

There is more suited 4" scope for imaging - in both TS and AA branding (It is believed that these are essentially the same scopes with different branding - Stellarvue also has them in their lineup):

https://www.teleskop-express.de/shop/product_info.php/info/p9868_TS-Optics-Doublet-SD-APO-102mm-f-7---FPL-53---Lanthan-Objective.html

https://www.altairastro.com/starwave-102ed-r-fpl53-refractor-459-p.asp

These have FPL-53 glass matched with lanthanum element (according to TS) - and people have been impressed with them. However they are in same price range as that discounted triplet that I linked to.

What is your budget exactly? With what I'm guessing your budget is (from your reaction to that scope I suggested and price of ones you asked about) - you will be best served with 80mm scope if you really want a refractor scope to image with. Alternatively, fitting with that sort of budget is 130PDS-150PDS type of scope with good coma corrector - but that is newtonian.

  • Like 1

Share this post


Link to post
Share on other sites

The ed80 is going to cost you more but will be maintenance free. If you are thinking at any point to move towards a dedicated camera then I find the ed80 causes some microlensing on my asi1600.

The 130pds is much cheaper but from time to time will need to be collimated and I would say stripped and flocked.

I do not think I would ever want to ever sell either though. Maybe one day a dual mount bar will pop up at tempting price. ;) 

  • Like 1

Share this post


Link to post
Share on other sites

Ok, think I will settle for an ED 80 to start , so thanks all for your input

This one will let me look around for a PDS at a later stage

https://www.ebay.co.uk/itm/TS-Optics-PHOTOLINE-Apo-Refractor-telescope-80-560-2-25-TSAPO80f7/372887345279?hash=item56d1d1587f:g:3u4AAOSw~XFeAHki

 

Edited by Frank the Troll

Share this post


Link to post
Share on other sites
9 minutes ago, Frank the Troll said:

Ok, think I will settle for an ED 80 to start , so thanks all for your input

This one will let me look around for a PDS at a later stage

https://www.ebay.co.uk/itm/TS-Optics-PHOTOLINE-Apo-Refractor-telescope-80-560-2-25-TSAPO80f7/372887345279?hash=item56d1d1587f:g:3u4AAOSw~XFeAHki

 

That is little brother of those 4" scopes we discussed earlier (better, more expensive versions with FPL-53/lanthanum glass) so it should be very good scope.

You might want to factor in FF/FR as well.

  • Thanks 1

Share this post


Link to post
Share on other sites
25 minutes ago, spillage said:

The ed80 is going to cost you more but will be maintenance free. If you are thinking at any point to move towards a dedicated camera then I find the ed80 causes some microlensing on my asi1600.

The 130pds is much cheaper but from time to time will need to be collimated and I would say stripped and flocked.

I have no problem with that, the 10" I built from 2nd hand bits and bobs ;) did try to sell it at one point, but no intrest

 

Edited by Frank the Troll
spelling

Share this post


Link to post
Share on other sites
3 minutes ago, vlaiv said:

That is little brother of those 4" scopes we discussed earlier (better, more expensive versions with FPL-53/lanthanum glass) so it should be very good scope.

You might want to factor in FF/FR as well.

FF/FR can wait a little bit. Cheers for your input

Share this post


Link to post
Share on other sites
On 13/02/2020 at 22:34, vlaiv said:

Not only that - such spikes are unmistakably artificial and out of place!

Surely that is a matter of taste, as is the case with many imaging techniques. 

  • Like 1

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.