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Uranium235

Imaging with the Samyang 135mm f2

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Here's a HaRGB image of the Rosette and Cone.

1908082758_RosetteandConeHaRGB900.JPG.2034e5f0f5c7748732ac8bf5bf0d193a.JPG

(2h22m RGB and 46m Ha, using the modded 1100D and 2 minute unguided subs. No flats (took them but they were overcorrecting so used GradEx to sort out vignetting), no darks.)

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On 13/04/2019 at 10:22, laser_jock99 said:

I've looked at buying this lens as a possible replacement for my ageing Nikon ED180 F2.8 which was the recomended fast widefield AP lens in its day.

I don't want to hook it up to a CCD- so has anyone got any unprocessed, full frame DSLR images at F2 to post? I'd like to see if it is an improvement on the 'slow' old Nikon! And also how well it handles CA- one of the Nikons failings (on my lens at least) was issues with CA wide open. I found I had to stop down to F4 and use a Lumicom Minus Violet filter (almost half the cost I paid for the lens!!).

This is a Sony full frame A7 in jpeg, If you want a raw frame i will add. Hope this helps,

CS

Rush

DSC00065.thumb.JPG.cc23f8b62bd8da30027c90c6c6a809a8.JPG

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Re procesed image of the Flaming Star. Just under 30 mins exp at iso 400 @ f 2.8.

Regards

Alan

received_565806260579963.jpeg

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3 minutes ago, Vixen4eva said:

Re procesed image of the Flaming Star. Just under 30 mins exp at iso 400 @ f 2.8.

Regards

Alan

received_565806260579963.jpeg

That’s really nice! How much cropping was there Alan? 

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Can this lens be mounted to a dslr and then supported by that connection alone? In other words can the lens "hang off" a dslr without applying too much stress?

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4 hours ago, bokchoy ninja said:

Can this lens be mounted to a dslr and then supported by that connection alone?

Seems to work fine for me, I have the camera body on a ball-head mount so I can frame images to my liking. It's possible that the lens tilts a touch relative to the sensor (AP is much more demanding than daytime photography) but I haven't really noticed.

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Posted (edited)
7 hours ago, bokchoy ninja said:

Can this lens be mounted to a dslr and then supported by that connection alone? In other words can the lens "hang off" a dslr without applying too much stress?

 

2 hours ago, Knight of Clear Skies said:

Seems to work fine for me, I have the camera body on a ball-head mount so I can frame images to my liking. It's possible that the lens tilts a touch relative to the sensor (AP is much more demanding than daytime photography) but I haven't really noticed.

In opposition, I have tilt with my Canon 1300D if I not support it.

If you check astro pictures from the different users on astrobin or flickr,

you will notice  evidence of the SOME tilt on Some images :)

So if someone does not have tilt... it does not mean, you will not have it... It is probably very related to camera quality plus Altitude of the target.

However, if you will not able to support it "Properly", - FOV is quite wide with Sammy and you will be able to crop without loosing much data, as I do at the moment ;)

Edited by RolandKol

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1 minute ago, RolandKol said:

So if someone does not have tilt... it does not mean, you will not have it... It is probably very related to camera quality plus Altitude of the target.

Yes, I thought my post was clear that my experience may not apply to everyone. It's something to be aware of but it may not be essential to support the lens.

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Another one shot with my canon 700D and the 135mm.

NGC7822

This is 60x300sec ISO1600 with an Astronomik 6nm Ha clip in filter. 

LRM_EXPORT_260434309912414_20190420_232142099.thumb.jpeg.452ec8b7e530b12d0ee92374e12e86f5.jpeg

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Posted (edited)

NA nebula region widefield, the dew got the better of me unfortunately! 

3 x 150s @ f2.8 

Bortle 3 skies

 

 

097E71C0-A45B-4436-BE8C-83C3ACD54C54.jpeg

Edited by Mark1489
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1 hour ago, Mark1489 said:

3 x 150s @ f2.8

Nice shot. What was the camera?

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1 minute ago, Adreneline said:

Nice shot. What was the camera?

Thanks! Nikon D5300 unmodified, ISO 400

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Really frustrating with all the clouds of late which is stopping me experimenting with my new ASI1600 with the Samyang 135mm. There might be undersampling but I still love the level detail combined with the wide'ish field of view - a compromise I can live with.

This is IC1396;  12x120s + 12x180s + 12x240s all at 200 gain/50 offset pre-processed separately in APP and then combined as HDR in PI, followed by a little bit of tweaking in PS. Stars removed using Annie's Astro Actions in PS.

Next time I'll aim to get all of Sh2-129 in the shot as well!

Thanks for looking.

Adrian

 

IC1396-stars.jpg

IC1396-nostars.jpg

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Another clear night here oop North. Being bank holiday i thought i`d make the most of it. I`m starting a new job tomorrow so its early nights from now on...?
Best night of the 3. Crystal clear all night.

So here we have an un named object as far i know. Saw it on a Cygnus mosiac image and thought i`d give it a bash.

Modded 450 d / Samyang 135 mm f 2 @ f 2.8 / 12 nm Ha clip filter / Vixen GPDX with skysensor 2000 pc.

50 x 4 mins @ iso 1600 (unguided). Captured via BYEOS. Stacked in DSS with calibration frames. Processed in Photoshop.

Thanks for looking
Alan

Cygnus nebulosity 220419 Samyang 135 f2 hps.jpg

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Took this last night also. Its a bit noisy. Only managed to get around 60 mins of data. One to come back to later in the year. Just too low atm. NGC 7822

Modded 450 d / Samyang 135 mm f 2 @ f 2.8 / 12 nm Ha clip filter / Vixen GPDX with skysensor 2000 pc.

16 x 4 mins @ iso 1600 (unguided). Captured via BYEOS. Stacked in DSS with calibration frames. Processed in Photoshop.

Thanks for looking
Alan

NGC 7822 WIP.jpg

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Something I found in my archive, a 2 minute shot of the NA & Pelican.

1714162761_NAPelican2minutes.JPG.f4042f3c8d5cdac1d485187c5427d7cc.JPG

Just a quick colour balance, stretch and slight noise reduction. Might have a go at processing this properly if I can find the time. Here's a closer crop of the nebulae.

1706029357_NAPelican2mincrop.thumb.JPG.aa630193fc071ea7b6ac8902fc622901.JPG 

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My latest achievement with this gem of a lens.

Canon 700D

71x300sec ISO1600 with Astronomik 6nm Ha clip in filter (bortle 6)

And 10x180sec ISO800 with IDAS LPS-D1 CLIP filter (bortle 2)

LRM_EXPORT_290905863305617_20190508_232647669.thumb.jpeg.d4ca7e13090db1c8b24f73071be6e184.jpeg

Emil

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Posted (edited)

I think it is amazing what this 135mm @ f2 plus the ASI1600 @ unity gain, offset 50 can achieve on a 50% moon night; this is 25 x 120s of Ha and 20 x 120s of OIII taken between 23.50 and 01.30 last night.

Sadr

Sadr-HOO.thumb.jpg.52bab206e735d2bdb30944ea8348cd65.jpg

Processed in PI with a final colour tweak in PS.

Adrian

Edited by Adreneline
Clarification
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My latest example with this awesome lens! Gamma Cygni region, 50x60 secs, ISO 800. Imaged with the moon in the sky but I was itching to get out, so probably lost a fair bit of detail, the moon gradient was a nightmare to remove!

525054550_GammaCygni.thumb.jpg.e4227d579098f7f5f239e257820119b0.jpg

 

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This is my first RGB image with the Samyang 135mm/ASI1600 combination albeit with some Ha and OIII added for good measure!

I'm amazed I got anything at all with the short night and clouds. In total this is 210s Red, 90s Green, 120s Blue, 720s Ha and 600s OIII all pre-processed in APP, processed and combined in PI PixelMath followed by a little colour tweaking in PS. The RGB were all 30s exposures, the NB was all 120s exposures. Even at 30s there was clear signal on the RGB

Spacing is really sensitive and as things stand I can only go as far as f4 and get reasonable FWHM values of less than 2.0.

NGC7000.thumb.jpg.0c53245b82f667e8f903bc9bf35211fc.jpg

IMG_8898.thumb.JPG.0dacf84bb2514b1164169dc6dc451685.JPG

Adrian

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Took this over two night this past weekend. 33 x 4 mins (unguided) @ iso 1600. Samyang 135 mm f2 @ f 2.8. Can`t wait to add some colour data!!!!

Alan

IC 1396 25 280519.jpg

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On 27/05/2019 at 11:19, Adreneline said:

This is my first RGB image with the Samyang 135mm/ASI1600 combination albeit with some Ha and OIII added for good measure!

I'm amazed I got anything at all with the short night and clouds. In total this is 210s Red, 90s Green, 120s Blue, 720s Ha and 600s OIII all pre-processed in APP, processed and combined in PI PixelMath followed by a little colour tweaking in PS. The RGB were all 30s exposures, the NB was all 120s exposures. Even at 30s there was clear signal on the RGB

Spacing is really sensitive and as things stand I can only go as far as f4 and get reasonable FWHM values of less than 2.0.

NGC7000.thumb.jpg.0c53245b82f667e8f903bc9bf35211fc.jpg

IMG_8898.thumb.JPG.0dacf84bb2514b1164169dc6dc451685.JPG

Adrian

Love the camera set up. Can you please give some details of the focuser. Apart from that, and the filter wheel, IMG_20190426_153019.thumb.jpg.6443953289a21fd502e7c3495294b381.jpgit's similar to mine

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Posted (edited)

Hi Scott.

I put some details here:

The filter wheel in the ZWO Mini EFW.

More than happy to provide more detail if you'd like.

Adrian

 

Edited by Adreneline
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Here's a few from a complete newcomer to camera lens imaging. Atik 460EX-135mm Samyang_Ha

1374811521_heartandsoul_Overlayed.thumb.png.152e5e4f6ba289f82e2d52abf15d0d24.png1250946634_SadrtoCrescent_Ha_Stack_Decon_Pro.thumb.png.a0cf247666edba0a9fd32d84fbbe6f1f.pngImage1croppedStretched2.thumb.png.018b48f6bb6619d5787924ab639fdf2f.png1187334470_American_PelicanNebulae_stretch_Gradient.thumb.png.27dc1c9baaf0a260a0f7603bdc8cd8bd.png726937735_FlamingStarNebula_Stretch_Gradient_Sharpen_Restretch.thumb.png.a79a5ffd3c6f8d621ccb02258796e0f6.png

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