Specific Reducer

[Stargazer66]

Hi all. I'm using a Nexstar 8se, I have been trying to photograph the sun but only capturing slivers of it. I was told by a friend to get a reducer. So can anyone point out which size reducer I would need for specifically photographing the full sun image. Thank You .

[Gfamily]

Which one will depend on your sensor size. 

You need to have a full half degree field of view to get the whole disc in one. 

You can check the field of view herehttps://www.skyatnightmagazine.com/astronomy-field-view-calculator/

 

[Starwatcher2001]

Hi and welcome aboard SGL.

At the risk of stating the obvious, don't aim your scope anywhere near the sun without the proper filters. eg https://www.firstlightoptics.com/solar-filters/astrozap-baader-solar-filter.html

If you're just holding your phone to the eyepiece (with a filter in place), a 30mm eyepiece should give you sufficient field to see and capture the whole of the Sun. If you're using a camera instead of an eyepiece you will need to know the sensor size as GFamily said. If you let us know what camera you're using, we can help further.

 

 

 

 

[Elp]

Is full disk possible with an 8se? I've got a short FL refractor (360mm) and this allows full disk, as does a Coronado PST which is 400mm. Doing mosaics is an alternative option.

[Cosmic Geoff]

There is a reducer for the C8 - known as the Celestron f6.3 reducer.  ( so called because it converts the f10 C8 to a f6.3) They are not cheap - mine cost £100 used, and they go for more than that on ebay. New around £150.

If you tell us what camera you are using, we can give you an idea of the FOV (or you can find out yourself with an online app).

[michael8554]

Here's my FOV with a Canon APS-C DSLR and a 8" SCT at f/6.3:

 

 

Any of the Celestron, Meade, Antares etc f/6.3 SCT Reducers will do.

Michael

 

 

[jacko61]

Just wanted to point out that backfocus for the .63 reducer on a celestron 8 inch reflector is 105mm so you might have to invest in some extension tubes too. 

Graeme 

[PeterCPC]

18 minutes ago, jacko61 said:

Just wanted to point out that backfocus for the .63 reducer on a celestron 8 inch reflector is 105mm so you might have to invest in some extension tubes too. 

Graeme 

It may be 85mm - see my post.

[jacko61]

5 minutes ago, PeterCPC said:

It may be 85mm - see my post.

I can't see an earlier post from you Peter (or is there a link missing? )

Graeme

[Starwatcher2001]

I think Peter is referring to this thread, Graeme:

https://stargazerslounge.com/topic/394370-f63-reducer-on-c8-back-focus/

[rcwinter]

if you follow the link below you will be able to enter your scope details, camera, reducer and it will display the suggested field of view for the setup 

https://www.12dstring.me.uk/fovcalc.php

hope that helps 

Rich 

[PeterCPC]

See also https://www.cloudynights.com/topic/767148-c8-with-f63-reducer-backfocus-help-with-zwo-533/

Post by ERHAD. All very confusing.

Edited May 4, 2022 by PeterCPC