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northwalesparry

Recommended eye pieces for a SCT.

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What eye pieces would you recommend for a 8inch SCT. I mainly look at star clusters and dso's .

Any advice would be greatfull.

 

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If you use a star diagonal, do you use 1.25" or 2" ? - if 2" then I would recommend one with the SCT fitting, (as shown in the images below), attached to my 're-modded' ETX 105 and to a f6.3 focal reducer/field flattener.

PIC021.JPG.317e3ab5bc2a32848d576782c9caf3ab.JPG

PIC022.JPG.ad2dde5173f39613817eb9f4f768708c.JPG

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A classic range of 22mm, 17mm, 13mm and 8mm would be perfect. In a 200mm SCT that will give x90, x118, x154 and x250. With that you can cover DSOs, open clusters, globular clusters and small planetaries.

Larger objects are never going to fit in a SCT's field of view, but, there are only a few that large.

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With my C8 i use the 25mm that came with scope and 2x barlow which i like best . For WF i like my Celestron 32mm plossi which i also use with barlow . For high power i have a 18mm Celestron Ultima with barlow . The barlow i use is an Ultima . The Ultima brand by Celestron was discontinued a long time ago but were some of the best ones at the time . But as mentioned 32mm, 25mm, 9-12mm plossi . These are 3 basic sizes great for an 8” SCT . What you should not do is overpower your scope what it can handle . 

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for a 8" sct u may need a very low ep 40 to 50mm 2 inch for that large stuff. 

i have the meade 4000 55mm pl its almost like looking through a finderscope (36x power in a  8" sct) but other scopes where i get close to 15x to 20x power.

joejaguar

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On 09/11/2019 at 06:34, northwalesparry said:

What eye pieces would you recommend for a 8inch SCT. I mainly look at star clusters and dso's .

Any advice would be greatfull.

 

By magnification: 50x, 100x, 150x, 200x, 250x

By exit pupil: 5mm, 2mm, 1.4mm, 1mm, 0.8mm

By magnification range:

<10x/inch low power (up to 80x); 10-20x/inch medium power (80-160x), 20-30x/inch high power (160-240x); >30x/inch ultra high power (>240x)

By object type: low (large nebulae and star clusters), medium (most DSOs), high (lunar, planets, planetary nebulae, double stars)

When I owned an 8" SCT (for 11 years), my most used eyepieces were 22mm (58x) ,13mm (98x), 8.8mm (145x).  I used an f/6.3 focal reducer to flatten the field.

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I forgot to mention in my earlier post...

On 09/11/2019 at 16:43, Philip R said:

If you use a star diagonal, do you use 1.25" or 2" ? - if 2" then I would recommend one with the SCT fitting, (as shown in the images below), attached to my 're-modded' ETX 105 and to a f6.3 focal reducer/field flattener.

PIC021.JPG.317e3ab5bc2a32848d576782c9caf3ab.JPG

PIC022.JPG.ad2dde5173f39613817eb9f4f768708c.JPG

...that I use these two eyepieces with my C6/SCT...

548055074_series4000uwa.jpg.dfcf28115e9eb29ce73faa4351897806.jpg  517405460_type1.jpg.6081a9d066256d23c85f03f0907fd47f.jpg

...and I also use a 6mm Radian & 13mm Nagler/Type 6 with my other 'scopes and the C6/SCT.

1053872347_TeleVue6mmRadian.jpg.a49170d1239f0e68529f9b4a2002827a.jpg  EP_EN6-13.0.jpg.647dcc9866db1b04c7ad85a48e606af1.jpg

note: eyepiece images are not to scale.

Edited by Philip R
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