Free Shipping on ALL Products
camera reviewsbest cameraslens reviewsphotography tipscamera forumvideo toursphotography bookssupport me
It is currently Fri Aug 22, 2014 2:20 am

All times are UTC




Post new topic Reply to topic  [ 10 posts ] 
Author Message
PostPosted: Fri Jun 22, 2012 9:29 pm 
Offline
User avatar

Joined: Sun May 25, 2008 12:48 pm
Posts: 8022
Location: UK
Just arrived today. Comes in a box foil wrapped for freshness. I picked this camera as a balance between sensor size and frame rate, attaining up to 15 fps at 1280x960. It is still a small sensor though, with the active area having about a 6x crop factor horizontally, a bit less vertically due to the squarer aspect. Why this instead of DSLR video? Two reasons: this doesn't have that pesky colour filter on top, and it also saves uncompressed video.

It is CS mount and comes with an extension ring bringing it to C mount. If the micro4/3 bunch haven't bought all the interesting C mount lenses already that is... it also comes with a screw in nosepiece that converts it to fit 1.25" astronomical eyepiece holders. I also ordered a shorter nosepiece which allows the camera to get closer to the device, which should help with achieving focus with trickier devices.

I also bought an EOS to C mount adapter so I can use my Canon lenses on this should I feel the need.

The camera is powered and controlled by a computer over USB connection. Included software lets you change the gain and other settings as required.

Finally... image samples? That'll have to wait. The main reason I bought this camera was to use it for solar imaging. The sun wasn't cooperating today and was darting from cloud to cloud. I suspect I can't get adequate focus range, which if confirmed with another go later means I'll have to work out a bodge.

_________________
Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.


Top
 Profile  
 
PostPosted: Fri Jun 22, 2012 10:13 pm 
Offline
Moderator
User avatar

Joined: Sat Sep 30, 2006 4:30 pm
Posts: 9811
Location: UK
.
Hey popo, congratulations! It'll be interesting to see how it performs. Solar, lunar, possibly planetary and, hopefully, some deep space. 8)

For the latter I'm really hoping that the forecast for Sunday night holds up. So few hours of darkness at the moment but I only need another 90 minutes of imaging to capture the last of my RGB suns for my North America nebula mosaic.

Bob.

_________________
Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8, M.Zuiko Digital ED 75mm 1:1.8.
Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


Top
 Profile  
 
PostPosted: Wed Jul 04, 2012 1:16 am 
Offline

Joined: Thu Jul 31, 2008 4:31 am
Posts: 296
Congrats Popo. I am still waiting for your review. In the meantime, let me share what I did with my DMK 31AU02 last year.

Image

_________________
Canon T2i (550D)- Tamron 17-50 F2.8 Non-VC, Sigma 70-200mm F2.8 EX DG OS HSM, Canon EF-S 55-250mm F4.5-F5.6
http://www.astronomyphotography.com


Top
 Profile  
 
PostPosted: Wed Jul 04, 2012 8:03 am 
Offline
User avatar

Joined: Sun May 25, 2008 12:48 pm
Posts: 8022
Location: UK
If the weather ever clears up enough for me to use it I'd do that review!

The few videos I took using it already, I'm still playing with. Still learning my way here. Maybe I didn't get enough data, or I need to further optimise settings (both in capture and processing), but I'm not getting any more detail than from DSLR stills although the noise is obviously lower.

_________________
Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.


Top
 Profile  
 
PostPosted: Wed Jul 04, 2012 9:33 am 
Offline
Moderator
User avatar

Joined: Sat Sep 30, 2006 4:30 pm
Posts: 9811
Location: UK
Hi popo,

I'm pleased to hear you've got the infinity focus issue you reported in another forum sorted. As for detail, what is the arc seconds per pixel of the DMK 41AU02 when fitted behind the Coronado and how does that compare with the theoretical resolution of the Coronado?

Bob.

_________________
Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8, M.Zuiko Digital ED 75mm 1:1.8.
Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


Top
 Profile  
 
PostPosted: Wed Jul 04, 2012 10:38 am 
Offline
User avatar

Joined: Sun May 25, 2008 12:48 pm
Posts: 8022
Location: UK
The infinity focus on the PST is not exactly resolved, more worked around. I wanted to get the whole sun in one go, and I still can't do that, yet. For whatever reason I just can't get infinity focus with the DMK directly, and had to resort to use a barlow element module to extend focus. But that makes the sun not fit in one go, and I have light matching issues when doing stitching. I'm wondering still if I can stick a reducer after the barlow, or is that a step too far?

As for arcsecond per pixel, never worked it out and probably wont. All I know is the sun is supposed to fit entirely in one go had I ever managed to get it working as intended. Reverting back to photographic stuff worked out previously, for the given pixel density we're going to be in the ball park of entering diffraction limiting at the PST's f/10, had the DMK been a bayer filter sensor. Since it is mono, we're almost certainly working in an optically diffraction limited region. Even with that, I don't believe I'm getting the detail potential I've seen from others with a regular PST. Is it focus, seeing, processing...? The list of variables is very long so I've got some way to go there, if I ever get another chance at it.

_________________
Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.


Top
 Profile  
 
PostPosted: Wed Jul 04, 2012 11:08 am 
Offline
Moderator
User avatar

Joined: Sat Sep 30, 2006 4:30 pm
Posts: 9811
Location: UK
popo wrote:
... if I ever get another chance at it.

Yeah, this weather is the absolute pits! :evil:

Maybe the barlow is marginally degrading the image but not enough, I would guess, to equal that of the AA filter with the DSLR. Sorry to hear you've not got native infinity focussing: it's a shame that the objective lens cell of the PST can't be moved back a millimetre or two. :(

Bob.

_________________
Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8, M.Zuiko Digital ED 75mm 1:1.8.
Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


Top
 Profile  
 
PostPosted: Wed Jul 04, 2012 11:25 am 
Offline
User avatar

Joined: Sun May 25, 2008 12:48 pm
Posts: 8022
Location: UK
I did manage to learn an awful lot about the design and construction of the PST. The issue isn't so much the objective, but more the light ray straightening lenses around the etalon which fixes the back focus distance. There is a simple fix if I don't care about warranty or resale value: I can chop a bit off the eyepiece holder! But do I want to go there yet?

_________________
Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.


Top
 Profile  
 
PostPosted: Mon Jul 16, 2012 7:27 pm 
Offline

Joined: Thu Jul 31, 2008 4:31 am
Posts: 296
yes popo, the pst was never design for photography so you will always be short of in-focus without the modification. That was a major motivation for me to save my money and get an Lunt 60mm instead. On day 1, I was able to capture stunning details. It was one of the easiest equipment I had the opportunity to work with.

we have some really nice weather on the west coast (finally) so I will dust off my Lunt and do more capture.

_________________
Canon T2i (550D)- Tamron 17-50 F2.8 Non-VC, Sigma 70-200mm F2.8 EX DG OS HSM, Canon EF-S 55-250mm F4.5-F5.6
http://www.astronomyphotography.com


Top
 Profile  
 
PostPosted: Mon Jul 16, 2012 8:17 pm 
Offline
User avatar

Joined: Sun May 25, 2008 12:48 pm
Posts: 8022
Location: UK
The annoying thing about the PST is that users of early versions didn't have any problems with attaining focus. Only more recent ones have that problem... so something must have changed. Lunt was never a consideration for me. I'm sure they're great, but nothing comes close to the VFM of the PST.

I still need to have more goes with the PST and the various optical bits I have, if the sky ever stays clear long enough for me to do so...

Longer term I might do a "PST mod" where the etalon of the PST is combined with new blocking filters on a bigger scope :D No more silly little 40mm aperture, without breaking the bank.

_________________
Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 10 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  

All words, images, videos and layout, copyright 2005-2012 Gordon Laing. May not be used without permission.
/ How we test / Best Cameras / Advertising / Camera reviews / Supporting Camera Labs

Webdesign by Alphabase IT
Powered by phpBB® Forum Software © phpBB Group