Alpy spectroscope?

[Gasman]

Hi folks

The new Alpy modular spectroscope from Shelyak looks promising, anyone know of any prices/details about it please?.

Thanks

Steve

[Merlin66]

Christian has given some details on the astronomical spectroscopy group:

http://tech.groups.yahoo.com/group/astronomical_spectroscopy/message/7099

Adjustable slit, +/-40mm collimator, 600 l/mm grating+grism, +/-40mm imaging lens. Additional guide and reference lamp options.

No prices or availablity at this stage.

[the rev]

Been looking at it on the shelyak site. Looks really good. Hope more details will be available soon.

[nytecam]

Looks an interesting modular lo/mid-res 'straight-through' linear design with a grism [grating+prism] to give zero deviation on mid[?] spectrum. Slitless mode like Staranalyser or slit with various slit widths in tiny turntable! Some excellent spectra of emission galaxies, complete with 'smile', in 20m exp - webpage @ http://www.shelyak.com/rubrique.php?id_rubrique=17

[Merlin66]

The "base" unit is around 650euro and about the same to add a reflective slit guide system.....

(Dr Ken Elliott has the CCDSpec - a similar 600 l/mm + grism + guide for about 1000gbp)

http://www.elliott-instruments.co.uk/ccdspec.html

[the rev]

Good price, am seriously considering getting one.

Will it work with my MX916 okay?

[Merlin66]

Kate,

With the short focal length imaging lens, the 11micron pixel size in the MX916 may reduce the resolution, but it should work OK. You'd need some spacers and a T thread to M42 adaptor.

[the rev]

Thanks Ken. Will need to look into this more

[nytecam]

Thanks Ken. Will need to look into this more

Kate - may like to contact their UK dealer www.iankingimaging.com

[robin_astro]

Kate,

With the short focal length imaging lens, the 11micron pixel size in the MX916 may reduce the resolution, but it should work OK. You'd need some spacers and a T thread to M42 adaptor.

11um pixels should be ok. The spec of R ~600 is for a 23 um slit which would be perfectly sampled with 11um pixels. You would need to check the width of the CCD though to check you get a sensible wavelength range (ALPY 600 with the guider module is almost identical in price to the Elliot instruments spectrograph but has more dispersion and hence resolution so it needs a bigger CCD (at least 8mm wide to get the full visible range). There is a table on the Shelyak website.

http://www.shelyak.com/rubrique.php?id_rubrique=17

The camera connection to the ALPY 600 is a T (M42x 0.75) thread (Do Starlight Xpress still use the old Pentax 42x1mm thread on this camera?) and back focus is an adjustable 10.5-21mm

Cheers

Robin

[robin_astro]

11um pixels should be ok. The spec of R ~600 is for a 23 um slit which would be perfectly sampled with 11um pixels. You would need to check the width of the CCD though to check you get a sensible wavelength range (ALPY 600 with the guider module is almost identical in price to the Elliot instruments spectrograph but has more dispersion and hence resolution so it needs a bigger CCD (at least 8mm wide to get the full visible range). There is a table on the Shelyak website.

http://www.shelyak.c...?id_rubrique=17

If the CCD is as I suspect the ICX083 then the width is 8.7mm which would give the full visible range from 3650 - 7300 A

Cheers

Robin

[the rev]

The camera connection to the ALPY 600 is a T (M42x 0.75) thread (Do Starlight Xpress still use the old Pentax 42x1mm thread on this camera?) and back focus is an adjustable 10.5-21mm

Cheers

Robin

Hi Robin,

The MX916 does have a Pentax thread.

Kate

[the rev]

Hello,

Does anyone know whether it would work okay on my 5 inch or would it work better on a 9.25sct?

Kate

[Merlin66]

Kate,

It seems to be designed for an >f5 system.

The C9.25 with the x0.63 reducer should be a good fit.

[the rev]

Thanks Ken. I thought it would be the better choice

Kate