new ASI 174MM ?

skywatcher

I saw a new camera 174mm will happen

do you have any information?

Sam@ZWO

yes, it will come soon

f15p5

Hi Sam,

The 174 looks to be a really nice size, any idea on price? Looking at the pictures I'm not sure the 2" lip is deep enough for secure attachment in focuser? Any images yet taken with it?

I'm glad to see you coming out with new and larger sensors, filling a hole in the market. Looking forward to your reply.

Richard

skywatcher

~ $600 !

Sam@ZWO

Hi Richard

yes,2" lip is not long enough

there will come a 1.25" adapter

we will start beta testing

so I think you will see some image soon

riklaunim

What's the cover glass material? Is it fused silica or something like that? One thing is hardness (the glass on my ASI120 wasn't that scratch resistant...) and the second is UV transmittance.

Sam@ZWO

the AR protect window is not fused silica

so it would stop UV transmittance

we would recommend to remove this protect window to shoot venus

IMX174 is more easy to clean than ASI120 and seems won't easily attach dusts

anyway, we will consider fused silica in the future

Sam@ZWO

riklaunim wrote:
What's the cover glass material? Is it fused silica or something like that? One thing is hardness (the glass on my ASI120 wasn't that scratch resistant...) and the second is UV transmittance.

do you think the filter from astronimk is suitable?

it pass UV( maybe 60% at 300nm), but it block IR (from 700nm)

http://www.astronomik.com/en/photographic-filters/mc-klarglas.html

riklaunim

Astrodon UVenus works within 325-381nm range. That Astronomik probably goes rapidly down in UV. You would have to search for a local vendor of fused silica windows.

Like those guys in UK http://uqgoptics.com/catalogue/Windows/FUSED_SILICA_WINDOWS.aspx have a lot of it, but they aren't particular cheap (good for comparing charts of various materials). Optimal solution for a camera would be to have the cover glass mounted as a 1,25" filter so it would be easily removable/replaceable (T2 and 1,25" threads on the camera front).

I got a fused silica "Barlow lens" from Edmund Optics on one of their sales and brightness difference compared with Meade TeleXtender for nearly equal scale was really big. Most of AR coatings and glass used in astronomy isn't optimized or friendly to UV... but UV imaging isn't very common either.

Sam@ZWO

riklaunim wrote:
Astrodon UVenus works within 325-381nm range. That Astronomik probably goes rapidly down in UV. You would have to search for a local vendor of fused silica windows.

Like those guys in UK http://uqgoptics.com/catalogue/Windows/FUSED_SILICA_WINDOWS.aspx have a lot of it, but they aren't particular cheap (good for comparing charts of various materials). Optimal solution for a camera would be to have the cover glass mounted as a 1,25" filter so it would be easily removable/replaceable (T2 and 1,25" threads on the camera front).

I got a fused silica "Barlow lens" from Edmund Optics on one of their sales and brightness difference compared with Meade TeleXtender for nearly equal scale was really big. Most of AR coatings and glass used in astronomy isn't optimized or friendly to UV... but UV imaging isn't very common either.

that's would be too expensive to equip such maybe unused window

so remove the old one is the easiest thing