protable tv for millicam
Posted 20 November 2012 - 12:41 PM
Posted 20 November 2012 - 03:29 PM
Posted 20 November 2012 - 03:44 PM
At star parties power may not be available. In that case you want a screen that will use the least amount of power unless you plan on bringing a big battery pack or a generator. A small flat screen will do well enough and will run for a long time with little power.
Posted 20 November 2012 - 05:01 PM
As Lorence said true portability is usually an issue of the power. Ideally for remote use you'd like a good quality LCD that will run off of 12v DC (so it can be battery powered) ... these however can get a bit pricey if you are just looking at portable LCD monitors. A less expensive solution are the LCD displays intended for remote gaming or DVD viewing in a car. The downside to many of these units is it can be a bit tough constantly accessing the menu to adjust brightness and contrast controls.
If power isn't an issue then you have quite a few choices.
"TV capabilities" is a bit vague. You don't care about TV tuner stuff, you just are looking for a direct video connection. An old portable TV can be a good inexpensive options as long as it has that direct video connection. As Jack mentioned a CRT based video monitor can also be a great option (I also have the Speco monitor he referenced).
About that video connection: The Mallincams have both a composite video and S-Video output. You'll find composite the most popular connection. It comes out of the Mallincam on a BNC connector and the most popular connection to the monitor is an RCA type of connector. For most folks and for the most flexibility the composite connection is the best bet. The S-Video option is slightly higher quality but it's getting harder and harder to find monitors and recorders with that interface.
Posted 20 November 2012 - 05:19 PM
It is waaay better than anything else I tried. I thought I had a poor quality camera before I used it. It is adjustable enough to 'dial in' the image, has enough bandwidth AND it's a CRT. It's the recommended monitor for a reason. Among the things I tried was a small 12V LCD and a 50" Plasma TV.
Posted 20 November 2012 - 06:58 PM
I have a Sony 9" portable DVD player that also has composite input. I use this monitor with its portable battery whenever I am outside and it works great, I pump the Svideo through a capture card to my pc in the house. I also have a LCD TV in the house and I can also switch the inputs and pump the Svideo to the TV ( with a 50ft Svideo cable). I have never seen the output on a Speco but I am plenty impressed with my mallincam as is, and I appreciate the portability and low cost AND dual function, after all it's a DVD player and my kids can watch videos in the car, so technically this was NOT a telescope accessory purchase which was a big plus from SWMBO's perspective.
Posted 20 November 2012 - 09:33 PM
Posted 20 November 2012 - 11:17 PM
Posted 21 November 2012 - 12:50 AM
In the field, I use a 'Digital Prism' 9" LCD TV. It isn't as nice as the Speco but is quite acceptable. It doesn't weigh 15 pounds or require 110 volts so it's much more practical for field use.
Posted 21 November 2012 - 04:32 AM
Posted 21 November 2012 - 12:16 PM
Posted 21 November 2012 - 12:34 PM
Nytecam, good choice. although cheap and a very good camera on certain objects, it is far less of a device than your present Lodestar.
Was thinking of joining the astrovideo crew via the low end NTech cam but this thread cured me - another piece of expensive kit needed in TV monitor and no way I'd play with 220v mains TV outdoors in dewy UK :o I'll stick with my laptop screen with single cabled USB powered cam
Posted 24 November 2012 - 08:15 PM
Posted 24 November 2012 - 11:53 PM
In standard NTSC 4:3 format (if not stretched), the display resolution is 480x234. This is less optimal.
Some 9" LCD wide screen DVD Players with A/V (composite video) IN capability have 800x480 resolution. In NTSC mode (if screen not stretched), the resolution will be 600x480.
However, a common inconvenience is that there is no easy way to adjust brightness and contrast on these improvised "monitors". I.e., has to make adjustment either on camera end or PROC Amp.
Posted 25 November 2012 - 09:01 AM
Most of these screens come with remotes that allow you to adjust brightness, contrast and tint. I generally find a mid-level for each and leave it alone.
234 vertical monitors are cheap, but considering you are going to use the screen for some time and thus amortize the cost, you should consider getting an LCD with the higher resolution and better contrast if you are looking for a 12-volt device.
What would be ideal? A light 12-volt LCD with much greater than 500:1 contrast, at least 480 vertical pixels if not more, enough to match the chip size, an S-video input (which current models don't have) and...cheap!
Posted 25 November 2012 - 09:40 AM
Posted 25 November 2012 - 10:43 AM
Posted 25 November 2012 - 11:32 AM
Posted 26 November 2012 - 07:31 PM
Posted 29 November 2012 - 08:06 AM
(1) must have A/V input selector switch (to take video input as a video monitor)
(2) must use 800x480 high resolution LCD glass
Note: some recent SONY models do not have these.
Here is a test shot of a model (9" wide 800x480, 500:1 dynamic contrast, 6 hour battery and unbelievable low price.)
For comparison, other test shots of display devices are here in CN.
(Sorry if this ruins the current low price market on some discontinued models...)
Posted 04 December 2012 - 12:18 AM
The LCD glass has the dimension of 200x110mm (8.98" diag) at 800x480 pixel resolution. The pixel pitch is 0.229mm (H) x 0.25mm (W), i.e., not exactly 1:1. See picture below.
Video Mode (analog)
Using NTSC video as the player's input:
"Normal" (uses 600x480 pixels) at 147mmx110mm display area (4:3 aspect ratio)
"Full" (uses 800x480 pixels) at 200mmx110mm display area (20:11 aspect ratio)
Movie Mode (digital)
In (MPEG4) Movie mode using USB flash drive, max video resolution is 720x480 and file has to be in MP4 simple profile format.
"Normal" (uses 600x422 pixels) at 147mmx97mm display area (3:2 aspect ratio)
"Full" (uses 800x422 pixels) at 200mmx97mm display area (2:1 aspect ratio)
"Zoom" (uses 800x464 pixels) at 200mmx106mm display area (15:8 aspect ratio)
Picture Mode (digital data)
Best-fit JPEG file should be in 4:3 aspect ratio, e.g., 640x480 resolution
"Normal" (uses 530x464 pixels) at 132mmx101mm display area (4:3 aspect ratio)
"Full" (uses 720x464 pixels) at 180mmx101mm display area (16:9 aspect ratio)
"Zoom" (uses 720x480 pixels) at 180mmx110mm display area (5:3 aspect ratio)
I was hoping for the player's display system is using a simple pixel-mapping method to preserve picture quality. Turn out to be interpolation everywhere while H and V stretched differently!
Well, I got my unit cheap so no complains .