Using a Coronado SolarMax stacking filter in a PST mod?

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digitalbio
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Using a Coronado SolarMax stacking filter in a PST mod?

Post by digitalbio » Sun Jul 20, 2014 2:20 am

I am a newbie to solar viewing/imaging so I apologize if my question is confusing, but I am currently doing a stage 1 (and likely a stage 2) PST mod by attaching the etalon assembly to a larger aperture OTA (80 mm or so).

Currently, I have a double-stacking setup using the SolarMax 40mm Ha Narrowband Element Front Unit & TMax Tuner, which is attached in front of the PST's objective lens.

My question is this - by going to a larger aperture OT, have I negated the usefulness of this stacking filter? If not, do I still try and attach it before the objective using a stepdown adaptor (thereby negating the aperture increase but hopefully still taking advantage of an increased focal length) or can this element be inserted into the optical train between the etalon and the OT? Of course, since the stacking filter operates by physically tilting, I am concerned about the mechanical strain, especially if I attach a camera to the back end.

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GUS
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Re: Using a Coronado SolarMax stacking filter in a PST mod?

Post by GUS » Sun Jul 20, 2014 5:14 am

Hi,welcome to the site. To install the DS etalon filter into the optical train of the 80mm PST mod ,you would need a parallel light beam through it, by using another lens(usually a negative lens) after the 80mm and before the DS unit, and then another lens behind the DS unit to re converge the light path again.You could use the 40mm DS unit in front of the 80 mm lens,but your scope will still only be a 40mm scope,you could use a barlow lens to get a longer focal length on your exisisting system instead of going to the trouble of making an 80mm scope only to use it as a 40mm one.

GUS.

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swisswalter
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Re: Using a Coronado SolarMax stacking filter in a PST mod?

Post by swisswalter » Sun Jul 20, 2014 7:27 am

Hi digitalbio

welcome to that wonderful site. Have fun in the sun
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE :)

from 7 am - 7 pm http://www.nanosys.ch

from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa ;)

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Re: Using a Coronado SolarMax stacking filter in a PST mod?

Post by marktownley » Sun Jul 20, 2014 8:03 am

GUS has summed this up very well :)
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http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

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