Fov in nikon

[barrie greenwood]

Hi just a quick one

I've been trying to get the double cluster in one shot but the fov is to smaller to fit it all in so the question is how can I do it?

is it down the scope or camera or something else

I'm using a 200p and a nikon D90  cropped sensor not full frame

Regards Baz

[geordie85]

You could try making a mosaic.

I use this site for checking the FOV for my scope and camera combo.

    http://www.blackwaterskies.co.uk/p/imagingtoolbox.html?m=1

[PeterCPC]

or you could use the field of view calculator in the Resources tab at the top of the page then Tools.

Peter

[barrie greenwood]

Thanks guys Sussed it now the camera needs to be full frame sensor

Baz

[ollypenrice]

Do a mosaic. We could get all complicated with dedicated astro software but for a cluster the free stuff likle Microsoft ICE will do it.

Olly

[Astrofriend]

Maybe your telescope don't have a big enough imagecircle to handle a fullframe camera!

Better to do mosaicing as suggested. Or a alternativ can be a reducer, but not shure it will work in this case, the image circle will be too small I think for a APS-C sensor.

/Lars

[iapa]

From SkySafari the double cluster is c 40arcmin across.

12dstring FoV calculator shows 200p with Nikon to have FoV of 90arc min.

are you using a 2x Barlow to get the focus? Normally required to allow focus of DSLRs on a reflector.

The Barlow  gives a FoV of 45" which makes the target tight fit.

The Skywatcher 0.9 coma corrector may help let you focus the DSLR and will also widen your field of view. I can't confirm as I use a 200P-DS which is designed with imaging in mind and can focus DSLR without Barlow.

The corrector gives the benefit of making stars towards the edge of the reflector rounder too.

the no cost option is as Ollie noted.

for the record I used a Nikon D90 for a time.