80ED and Hutech Focal Reducer/Field Flattener

[avandonk]

Here are two pics of Carina taken with 80ED with/without Hutech DGL focal reducer/field flattener. Both images reduced in size only (unprocessed) from JPG.
Camera Canon 5DH
With FR
http://users.bigpond.net.au/avandonk/80ED+FR_2.jpg

Without FR
http://users.bigpond.net.au/avandonk/80ED_2.jpg

You be the judge how well it works.

Bert

[Striker (Tony)]

Thats a huge difference.....well worth the money Bert.

There around $500AUD I think.

[tornado33]

[IMG]http://www.iceinspace.com.au/forum/attachment.php?attachmentid=8823&st c=1

Yes the flattener makes a difference. Its such a great camera though. I hope you dont mind but I used Gradient Xterminator in Photoshop to get rid of any vignetting, as well as neutralise the sky background, and Levels to then darken it. I used the image taken with the flattener.
Scott

[astroboy]

Looks great Burt

Really makes use of the 5D's huge chip
I wonder if its worth experimenting with the Borg spacers ( that come with the reducer ) to tighten up the corners even more .
did you use the spacer recomended for the Borg 101 ( 640 mm FL )
Great result anyway.

[avandonk]

The images were taken without either spacer. You are of course correct astroboy, the next step is to try the recommended spacer. I had made a reducer/flattener from a 40mm dia 320mm FL achromat which works quite well with the 20D but vignettes with the 5DH.

I did not bother to try the spacer last night as conditions were not good. There was smoke due to the bushfires and haze and seeing was so bad even Sirius was flickering.

I was so amazed how well the FR was working under the conditions that I just took some pictures of the usual suspects.

Thanks Scott the vignetting is caused by the 80ED and not the FR. I thought I would put unprocessed images up so the comparison would be unbiased.

I am hoping to be able to work out the optimum spacer (if possible) to see how this Hutech FR performs with my Tal 200k as a field flattener. The size of the 5DH sensor shows up any field curvature if present that was not noticeable with the 20D.

The fact that this reducer can be adjusted with a spacer to optimise it to suit the focal length of any refractor from 500mm to 800mm makes it a worthwhile if somewhat expensive buy.

Bert

[avandonk]

Here is one for Scott. What is the little red thing in this picture?http://users.bigpond.net.au/avandonk/JB1.jpg

The center is the Jewel Box.