APO 80 and focal reducers

[akhnaton]

Is it possible to use a f/3.3 on an APO 80 without getting a coma?

[Mark Sibole]

The 3.3 focal reducer will coma.
There is a lot less coma if you use it with no extensions at all but coma is still evident.
You can use the 6.3 focal reducer with good results.

Regards

Mark

[Dave]

Mark,

How do you attach the 6.3 focal reducer to the APO 80?

[Mark Sibole]

On mine I use the t ring adapters I received with the 3.3 reducer on the camera side.
On the scope side I used the sct to 2 inch adapter i recieved with the LX200R.
You will need the t ring adapter for either focal reducer to connect to the imager.
And the SCT to 2 inch adapter for the scope side of the reducer.

Regards

Mark

[Dave]

Thanks Mark.

[ocsi]

Hi,

I just bought a used Televue field flattener (TV-85) for little apo. I think this is needed for imaging. I took a picture about a subject without flattener http://osci.extra.hu/meade80/meade_test1.jpg  and with flattener too : http://osci.extra.hu/meade80/flattener.jpg . You can see the difference int the left side of the brick . In the first picture there is a blur part in the left side. But in the second picture the same place is nice. Therefore i think flattener is needed for correct imaging.

ocsi