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Ronchiscreens.com still in bizness?

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#1 precaud

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Posted 13 June 2013 - 09:28 PM

I ordered a couple screens from this guy yesterday, but have received no confirmation from them. Just sent an email to the address on their help page, and it is bounced back as "No such user". Tried again, same results.

Has anyone successfully done business with them recently?

Are there any good alternatives? I'd rather not mess around with situations like this.

#2 kfrederick

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Posted 14 June 2013 - 04:53 AM

http://www.newportgl...com/aronchi.htm newport glass has film ones They work fine .There are glass ones also

#3 MKV

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Posted 14 June 2013 - 06:10 AM

That's odd. Ordered several about a month ago; quick service, no problems.

#4 Mirzam

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Posted 14 June 2013 - 06:42 AM

I ordered two screens from Ronchiscreens about 6 weeks ago. I don't recall getting a confirmation but the screens arrived quickly. Their screens worked better than a screen that I purchased years ago from Willmann-Bell.

JimC

#5 Pinbout

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Posted 14 June 2013 - 06:47 AM

I just got a bounce back also. I see at the bottom of the page he's into wedding gowns. :lol:

#6 Pinbout

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Posted 14 June 2013 - 08:25 AM

hey, although there was an automatic reply about not valid email, I just received an email from him so he's still in business.

#7 precaud

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Posted 14 June 2013 - 09:42 PM

Likewise. I was working out of town all day, but upon return, there was an email from Joe followed by a shipping confirmation a few hours later.

#8 precaud

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Posted 19 June 2013 - 09:50 AM

I got my 133 and 250 LPI screens yesterday and used them last night. Very useful tools, indeed. Boy, is it absolutely critical to keep one's eye in exactly the right position when using it... more sensitive than any eyepiece I've encountered by far... I'm thinking a camera setup (attached to the focuser body and not the drawtube) would aid in the image interpretation, yes?

#9 Pinbout

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Posted 19 June 2013 - 10:29 AM

I'm thinking a camera setup (attached to the focuser body and not the drawtube) would aid in the image interpretation, yes?



I just shoot afocal with my 18-55 inexpensive zoom on a manual gem mount.

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#10 precaud

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Posted 19 June 2013 - 10:44 AM

Danny, I've seen that pic of yours and that seems to be the way to go. Can you recommend an afocal mount? Some I've seen look pretty cheesy.

#11 Pinbout

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Posted 19 June 2013 - 10:56 AM

this is the best afocal mount for taking rochigrams I've found so far :grin:

#12 precaud

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Posted 19 June 2013 - 11:03 AM

Hmmm... interesting... but I don't see a price listed. :)

But seriously, you can perfectly hold the camera lens in exactly the needed XYZ coordinate to take an accurate photo?

#13 Pinbout

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Posted 19 June 2013 - 11:09 AM

for ronchigrams never had a problem, for a Knife Edge I always have a problem. Oh Lord do I have problems :grin:, the KE is where I need a mount.

#14 Pinbout

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Posted 26 June 2013 - 08:40 AM

just tested my tv genensis sdf with the 250 screen last night. yeah its soft but it looks like it did with the eye so I know its on point. top right is clipped with my finger trying to block out stray light with an old pancake lens that gets down to f1.4.

boy I want those new cameras that go to 12k iso. :grin:

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#15 precaud

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Posted 26 June 2013 - 08:54 AM

Nice. I have used my 250lpi screen but haven't tried photo'ing it yet. I'm going to try my old Canon S30, it was made before pixel count craze took over and gives some of the most noise-free images I've seen.

So what do you see in that image? The lower left quadrant looks suspect to me.

On my dobs, I don't see any sign of edge issues with the Ronchi, even though the star test is definitely cleaned up with an aperture mask. I was hoping Ronchi would be more revealing of edge issues...

#16 Pinbout

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Posted 26 June 2013 - 09:19 AM

The lower left quadrant looks suspect to me.


a normal star test does not show any sign of an edge issue

#17 precaud

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Posted 27 June 2013 - 12:29 AM

I tried to take an afocal Ronchi shot tonight, with zero success. Nothing but black screen How high are you cranking the camera's ISO?

#18 precaud

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Posted 27 June 2013 - 10:43 AM

Another couple reality-check questions for the experienced Ronchi testers. Last night, TDE was very visible in the outfocus, but not nearly so much in the infocus. Is that as it should be?

And if the lines start their "turn" say 10% of the radius from the edge, I can translate that proportionally into the size of edge mask required to hide it?

#19 Pinbout

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Posted 27 June 2013 - 11:15 AM

I made my iso as high as it goes and my lens was at f1.2...still had to hold it for a couple of seconds.

can you sketch what you saw and post it?

#20 precaud

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Posted 27 June 2013 - 11:29 AM

OK, I'll try again tonight. My drawing skills are marginal at best... ;)

#21 sopticals

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Posted 28 June 2013 - 03:40 AM

Another couple reality-check questions for the experienced Ronchi testers. Last night, TDE was very visible in the outfocus, but not nearly so much in the infocus. Is that as it should be?

And if the lines start their "turn" say 10% of the radius from the edge, I can translate that proportionally into the size of edge mask required to hide it?


Yes, to both questions. Inside ROC gives more info on center mirror issues, while outside ROC does for outer regions.

Masking in proportion works well.At 10% the edge is more accurately called a "rolled down edge".

Stephen.(44deg.S.)

#22 precaud

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Posted 28 June 2013 - 07:22 AM

Thanks Stephen. I was using the 10% figure just as an example, but the reality isn't too much less... :(

#23 Live_Steam_Mad

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Posted 24 December 2013 - 11:01 PM

I just ordered 2 large (6 x 6 cm) Ronchi gratings of 133 LPI and also 250 LPI from ronchiscreens.com. I'll be interested to see what results I get with my scopes when the gratings arrive. I hope to report back with some results.

Regards,

Alistair G.

#24 Live_Steam_Mad

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Posted 26 December 2013 - 01:40 PM

Joe just e-mailed me to say my Ronchi screens are now in the post. I already have an 8" disc of completely stress-free (tested and verified with my polarizer, much better than my friend Jon's cross of death blanks) BoroSilicate glass I got a few months back, and next will be some grinding powder and then maybe I can make my own Newtonian, I'm thinking around F5.5 (don't like long tubes).

Regards,

Alistair G.

#25 Pinbout

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Posted 26 December 2013 - 02:21 PM

For star testing I'd use the 250. I cut a small piece and glued it with silicone into a 35mm film container.

http://www.cloudynig...93&size=big&...






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