Just some theoretical comparisons on the 2 options Steve has suggested.
Samyang vs Redcat
5.75 arc secs / pixel Samyang vs 3.10 arc secs Redcat
Fov: 10.0° x 6.67° Samyang vs 5.38° x 3.60° Redcat
Theoretical integration times for same photon capture:
Samyang at f2. 8 - 60 seconds
Samyang at f3. 2 - 80 seconds
Redcat at f4. 9. - 180 seconds
Didn't consider Samyang being used at f2.
There are obviously practical considerations, flatness of field and star shapes, which would best be compared with a quick test using both on the same night. There may issues such as how frequently refocusing may be required which can only be determined longer term.
Upon first reading the thread I quickly made a choice, but after doing the math which I hope I got right, I'm equally happy with either. So whilst I sit happily on the fence I'll leave it up to everyone else who has an interest to make my mind up for me. One of the perks of being the first to reply.
Cheers,
Ray
Samyang vs Redcat
5.75 arc secs / pixel Samyang vs 3.10 arc secs Redcat
Fov: 10.0° x 6.67° Samyang vs 5.38° x 3.60° Redcat
Theoretical integration times for same photon capture:
Samyang at f2. 8 - 60 seconds
Samyang at f3. 2 - 80 seconds
Redcat at f4. 9. - 180 seconds
Didn't consider Samyang being used at f2.
There are obviously practical considerations, flatness of field and star shapes, which would best be compared with a quick test using both on the same night. There may issues such as how frequently refocusing may be required which can only be determined longer term.
Upon first reading the thread I quickly made a choice, but after doing the math which I hope I got right, I'm equally happy with either. So whilst I sit happily on the fence I'll leave it up to everyone else who has an interest to make my mind up for me. One of the perks of being the first to reply.
Cheers,
Ray
Ray
Roboscopes Guinea Pig
0
Undo
Votes
Hopefully, there will be no halos.
On another topic, do we plan to upgrade the camera of Pier 1?
294MM at Bin2 would be a great upgrade. The QE is much higher, which makes a difference in an F7 system. Also, the resolution is much higher at 11 MP.
I made that upgrade one year ago and am very happy with my decision. If you sell the old 1600MM at the second-hand market, I think the upgrade could cost less than 600USD.
On another topic, do we plan to upgrade the camera of Pier 1?
294MM at Bin2 would be a great upgrade. The QE is much higher, which makes a difference in an F7 system. Also, the resolution is much higher at 11 MP.
I made that upgrade one year ago and am very happy with my decision. If you sell the old 1600MM at the second-hand market, I think the upgrade could cost less than 600USD.
Hopefully, there will be no halos.
On another topic, do we plan to upgrade the camera of Pier 1?
294MM at Bin2 would be a great upgrade. The QE is much higher, which makes a difference in an F7 system. Also, the resolution is much higher at 11 MP.
I made that upgrade one year ago and am very happy with my decision. If you sell the old 1600MM at the second-hand market, I think the upgrade could cost less than 600USD.
I am not keen on the 294 as it is native 1x1 binned and ZWO have already binned it 2x2 in software themselves to get the 4.63 pixel size, this makes the pixels far to small for Pier-1
I think ZWO will release new cameras this year that are back illuminated and have zero amp glow, this is what I am waiting for if I am honest as the ZWO 4/3rds sensor range is long overdue an upgrade
As soon as they do, it will get swapped
Steve
Please ignore my dylexia wherever possible, just be thankful I can control my Tourettes ;)
Things to do, so little time!
Steve
Roboscopes Tea Boy
0
Undo
Votes
The only new camera I am aware of from ZWO is the 100MP 44x33mm camera. I would be thrilled if we have that
The only new camera I am aware of from ZWO is the 100MP 44x33mm camera. I would be thrilled if we have that
it just so happens that I have some 65mm filters in stock for big sensors, perfect for a Planewave RHO 350 that new big sensor is
ZWO released 2 smaller cameras a few weeks ago for planetary use, I have been told that new cameras are on the way so fingers crossed that my source is correct
Steve
Please ignore my dylexia wherever possible, just be thankful I can control my Tourettes ;)
Things to do, so little time!
Steve
Roboscopes Tea Boy
Most of the bits have arrived now so next clear evening we can begin testing the new Mono widefield rig. Due to the very wide field we have opted for a flat panel for this also
Specs are:
Canon 200mm F/2.0 IS USM L Pro camera lens
Astromechanic new slimline focuser
ZWO 6200 MM Pro full frame camera
ZWO 7 position 2” filter wheel
Antlia LRGB HOS 2” 3nm filters
Deep Sky Dad Heated Flip Flat Panel
MHP v4 control box
]
Specs are:
Canon 200mm F/2.0 IS USM L Pro camera lens
Astromechanic new slimline focuser
ZWO 6200 MM Pro full frame camera
ZWO 7 position 2” filter wheel
Antlia LRGB HOS 2” 3nm filters
Deep Sky Dad Heated Flip Flat Panel
MHP v4 control box
All the parts have now arrived for the new Canon 200mm wide-field and Pete has begun testing
The good news:
I really wish ZWO fitted a tilt adjuster in each corner as it would make this next job a breeze to do
The testing continues but I think once finished this setup is going to be a bit epic....
Steve
The good news:
- No internal reflections have shown so far[/*]Lens is very sharp even at F2[/*]We may leave at F2 or stop it down only a little[/*]
- As expected the ZWO sensor is not flat so we (Pete) have a lot of work to do getting it spot on with shims and the tilt plate
[/*]
I really wish ZWO fitted a tilt adjuster in each corner as it would make this next job a breeze to do
The testing continues but I think once finished this setup is going to be a bit epic....
Steve
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