anything similar but better/quicker than the sw ed80

[iwols]

hi guys any thoughts on the above with similar focal distance thanks

[Ben the Ignorant]

Hi.

This focuser should take heavier loads and allows a wider fully illuminated field:

https://www.teleskop-express.de/shop/product_info.php/info/p8637_TS-Optics-PHOTOLINE-80mm-f-7-FPL53-Apo-mit-2-5--Zahntrieb-Auszug.html

This one is faster:

https://www.teleskop-express.de/shop/product_info.php/info/p10625_Long-Perng-S500F-A-80-mm-f-6-25-FPL53-APO-Refraktor.html

There is also the Esprit 80 triplet but it costs more than 1200€ and you probably know it.

Same for the specially fast TS 80 triplet fitted with a three-element corrector, f/.4:

 https://www.teleskop-spezialisten.de/shop/Teleskope/ED-APO/80-90mm/TSAPO81Q-TS-Imaging-Star-80mm-f/4-4-6-element-Flatfield-APO-Teleskop-fuer-APS-C-Sensoren::1288.html

And then they have the little-known Kson 80 f/5.5 doublet:

https://www.teleskop-spezialisten.de/shop/Teleskope/ED-APO/80-90mm/Kson-ED805-5-80mm-f/5-5-440mm-ED-APO-Refraktor::3544.html

I am personally very curious about the Kson and hope to try one (visually).

 

[alacant]

Hi. This is a triplet, is faster, more economical and has a proper focuser. HTH

[vlaiv]

Similar focal distance, but larger aperture?

TS 102ED F/7 FPL53/Lanthanum or StellarVue SV102 Access (same scope) with x0.75 riccardi  flattener / reducer (https://www.teleskop-express.de/shop/product_info.php/info/p5120_Riccardi-Reducer-and-Flattener---42mm-field---0-75x-for-Refractors-and-RC.html )

for focal length of 535mm, or there is x0.79 corrector / flattener for 564mm

There is also photoline triplet version for better color correction 102 F/7 triplet, and another one 107mm F/6.5 again with flattener / reducer (options as above x0.75, x0.79).

EspritED100 is another option for 550mm.

And then, there are cheaper alternatives with similar FL:

SW 130PDS (650mm), 6" F/4 Newtonians (600mm) with suitable CC (there are some that shorten focal length, by x0.95 or by x0.73) and ultimate speed at around 600mm (not being cheap):

https://www.teleskop-express.de/shop/product_info.php/info/p4611_Boren-Simon-8--f-2-8-PowerNewton-Astrograph---Carbon-Tube.html

But all these add collimation and diffraction spikes to the story

Or very expensive alternative:

http://www.takahashi-europe.com/en/epsilon-180ED.specifications.php

with 500mm FL.

[iwols]

any thoughts on this....Skywatcher Esprit 80 ED APO Pro Triplet Refractor  or this Skywatcher Esprit 100 ED f/5.5 Super Apo Triplet Refractor

[vlaiv]

1 hour ago, iwols said:

any thoughts on this....Skywatcher Esprit 80 ED APO Pro Triplet Refractor  or this Skywatcher Esprit 100 ED f/5.5 Super Apo Triplet Refractor

Not sure what your goal is?

Esprit 80 will give you same light gathering power, but due to shorter focal length will decrease your working resolution.

Esprit 100 will on the other hand increase light gathering power, whilst maintaining focal length close to that of ED80 (with x0.85 flattener being 510mm, native at 600mm). There is matching field flattener for Esprit 100 without changing focal length, so it stays at 550mm. But this will be increase of ~56% in light gathering, and at best, increase in ~25% SNR for same imaging time (this is best case scenario - 0 LP, 0 read noise, 0 dark current noise, and it translates to shortening imaging time by 1/3).

Is your goal wider field or just simply "less time capturing" at resolution that you are already working on?

Depending on your level of LP it might be hard to significantly reduce capture time - more LP you have, less obvious will be benefits of additional aperture - simple fact is that at some point LP becomes dominant source of noise and larger aperture gathers more photons of both targets and LP. Most obvious benefits of having larger aperture at the same focal length will be in dark skies or when doing NB imaging.

[iwols]

hi my goal is try to reduce the imaging time it is taking me cheers

[vlaiv]

1 minute ago, iwols said:

hi my goal is try to reduce the imaging time it is taking me cheers

Well, in that case, go with significantly larger aperture, either 6" or 8" while keeping focal length close to target - that would mean reflector design, so be prepared to fight collimation, coma, tilt