Hello All,

does anybody of you had issues with the filter wheel non perfectly positioning the filter over the ccd window?

The test I did was:

1) Opening the cover and positioning the filter number 1 over the window manually

2) by using a common software, moving all the filter carousel (LRGBH) one by one over the window

3) After coming back to the first filter again (L) the correct position is lost, i.e. is shifted of, let's say 1mm

A similar test was:

0) power off camera

1) move manually the?filter 1 correctly over the ccd window

2) power on camera

3) the camera goes into starting mode moving the carousel of a complete rotation.

4) The filter 1 does not come in the same place, but it is slightly "behind" the correct position

How can I adjust this?

Many thanks for your help

Nicola

--

Nicola
Sky Monsters -
Skype: betelgeuse368

Hi Nicola,

Several suggestions. The position of the filter wheel is determined by a particular barcode assigned to each filter slot, and read by an optical scanner, as is the case on my 683wsg. Is anything on the filter wheel scratched or marred in any way as to compromise this?

Also, the rotation of the filter wheel is accomplished by a motor and capstan pressured against the rubber ring around the edge of the filter wheel. I had this issue (don't know why - the camera is in an observatory), and fixed it by gently cleaning the rubber ring on the filter wheel, as well as the surface of the capstan roller against which it is pressed. This assured that good contact between the capstan and rubber ring was maintained.

That's all I can think of for now. Hope it helps a bit

?- - Steve

On Wed, Jun 14, 2023 at 8:50?AM NIcola Montecchiari <omega.centauri@...> wrote:

Hello All,

does anybody of you had issues with the filter wheel non perfectly positioning the filter over the ccd window?

The test I did was:

1) Opening the cover and positioning the filter number 1 over the window manually

2) by using a common software, moving all the filter carousel (LRGBH) one by one over the window

3) After coming back to the first filter again (L) the correct position is lost, i.e. is shifted of, let's say 1mm

A similar test was:

0) power off camera

1) move manually the?filter 1 correctly over the ccd window

2) power on camera

3) the camera goes into starting mode moving the carousel of a complete rotation.

4) The filter 1 does not come in the same place, but it is slightly "behind" the correct position

How can I adjust this?

Many thanks for your help

Nicola

--

Nicola
Sky Monsters -
Skype: betelgeuse368

Good morning, Nicola.?

It’s very simple: take a cotton swap and dampen it (not soak it) with isopropyl alcohol - any percentage is fine - and gently swab the o-ring as much as is available, and the capstan, as well.?

My camera was only 2 years old when the issue developed, which was unusual, but it did solve the problem. I hope it will work for you.?

?- - Steve?

Sent From Steve’s IPhone?

On Jun 15, 2023, at 4:12 AM, NIcola Montecchiari <omega.centauri@...> wrote:

?

Hi Steve,

thanks for the suggestions. Would you please explain to me the procedure you used to clean the rubber ring and the capstan roller?

Many thanks

Nicola

Il giorno mer 14 giu 2023 alle ore 22:31 Steve Solon <galaxyshots84@...> ha scritto:

Hi Nicola,

Several suggestions. The position of the filter wheel is determined by a particular barcode assigned to each filter slot, and read by an optical scanner, as is the case on my 683wsg. Is anything on the filter wheel scratched or marred in any way as to compromise this?

Also, the rotation of the filter wheel is accomplished by a motor and capstan pressured against the rubber ring around the edge of the filter wheel. I had this issue (don't know why - the camera is in an observatory), and fixed it by gently cleaning the rubber ring on the filter wheel, as well as the surface of the capstan roller against which it is pressed. This assured that good contact between the capstan and rubber ring was maintained.

That's all I can think of for now. Hope it helps a bit

?- - Steve

On Wed, Jun 14, 2023 at 8:50?AM NIcola Montecchiari <omega.centauri@...> wrote:

Hello All,

does anybody of you had issues with the filter wheel non perfectly positioning the filter over the ccd window?

The test I did was:

1) Opening the cover and positioning the filter number 1 over the window manually

2) by using a common software, moving all the filter carousel (LRGBH) one by one over the window

3) After coming back to the first filter again (L) the correct position is lost, i.e. is shifted of, let's say 1mm

A similar test was:

0) power off camera

1) move manually the?filter 1 correctly over the ccd window

2) power on camera

3) the camera goes into starting mode moving the carousel of a complete rotation.

4) The filter 1 does not come in the same place, but it is slightly "behind" the correct position

How can I adjust this?

Many thanks for your help

Nicola

--

Nicola
Sky Monsters -
Skype: betelgeuse368

--

Nicola
Sky Monsters -
Skype: betelgeuse368