Ohhh ok my Rolleiflex is weirder than I thought. It's had a fresnel installed under the focus screen (presumably at a camera shop), the fresnel has a tiny chunk missing from one edge, and there were two shims lost inside the top half
It used to backfocus ever so slightly, with the shims it doesn't
It used to backfocus ever so slightly, with the shims it doesn't
November 3, 2026 at 7:38 AM
Ohhh ok my Rolleiflex is weirder than I thought. It's had a fresnel installed under the focus screen (presumably at a camera shop), the fresnel has a tiny chunk missing from one edge, and there were two shims lost inside the top half
It used to backfocus ever so slightly, with the shims it doesn't
It used to backfocus ever so slightly, with the shims it doesn't
#うちの子 #銀灰狐娘 #のう #濃 #お濃 と お風呂に #入浴中
#AIArt #AIGirl #AIWaifu #BackBoobs #BackFocus #DigitalArt #DigitalGirl #DigitalWaifu #FemaleArmpitHairPeek #HugeAss #HugeBlackNipples #MyWaifu
#AIArt #AIGirl #AIWaifu #BackBoobs #BackFocus #DigitalArt #DigitalGirl #DigitalWaifu #FemaleArmpitHairPeek #HugeAss #HugeBlackNipples #MyWaifu
October 25, 2026 at 10:10 PM
Partial Heart Nebula in Narrowband - From Ryan Kinnett (rkinnett.bsky.social) - https://flic.kr/p/2mHWS5h
September 7, 2026 at 8:00 AM
Partial Heart Nebula in Narrowband - From Ryan Kinnett (rkinnett.bsky.social) - https://flic.kr/p/2mHWS5h
Partial Heart Nebula in Narrowband - From Ryan Kinnett (rkinnett.bsky.social) - https://flic.kr/p/2mHWS5h
August 22, 2026 at 8:00 PM
Partial Heart Nebula in Narrowband - From Ryan Kinnett (rkinnett.bsky.social) - https://flic.kr/p/2mHWS5h
Thanks! It is!
Now I’m trying to see how well it’s going. I had a brief concern that I had an OAG shadow, but it was more of a Moon effect. (Shadow of scope and dew shield.)
Field is pretty flat, but some elongation on one side. I could stand to increase backfocus a bit next session.
Now I’m trying to see how well it’s going. I had a brief concern that I had an OAG shadow, but it was more of a Moon effect. (Shadow of scope and dew shield.)
Field is pretty flat, but some elongation on one side. I could stand to increase backfocus a bit next session.
February 18, 2024 at 2:09 AM
Thanks! It is!
Now I’m trying to see how well it’s going. I had a brief concern that I had an OAG shadow, but it was more of a Moon effect. (Shadow of scope and dew shield.)
Field is pretty flat, but some elongation on one side. I could stand to increase backfocus a bit next session.
Now I’m trying to see how well it’s going. I had a brief concern that I had an OAG shadow, but it was more of a Moon effect. (Shadow of scope and dew shield.)
Field is pretty flat, but some elongation on one side. I could stand to increase backfocus a bit next session.
How to set the backfocus of your camera
YouTube video by Matthijs Van Rossum
www.youtube.com
April 1, 2025 at 6:36 PM
M101 – the Pinwheel Galaxy, captured widefield from Koblenz on April 16. 15 frames at 300s, taken during a camera backfocus calibration session.
▼ Baader Apo 95 CaF₂ | ToupTek SkyEye24AC
astrocamp.eu/en/m101-wide...
#astrophotography #astronomy #nature #deepsky
▼ Baader Apo 95 CaF₂ | ToupTek SkyEye24AC
astrocamp.eu/en/m101-wide...
#astrophotography #astronomy #nature #deepsky
April 20, 2026 at 9:08 PM
M101 – the Pinwheel Galaxy, captured widefield from Koblenz on April 16. 15 frames at 300s, taken during a camera backfocus calibration session.
▼ Baader Apo 95 CaF₂ | ToupTek SkyEye24AC
astrocamp.eu/en/m101-wide...
#astrophotography #astronomy #nature #deepsky
▼ Baader Apo 95 CaF₂ | ToupTek SkyEye24AC
astrocamp.eu/en/m101-wide...
#astrophotography #astronomy #nature #deepsky
Pitää olla hyvä backfocus.
February 25, 2026 at 11:28 AM
Pitää olla hyvä backfocus.
Here is NGC 281! The Pacman Nebula, which is 9,459 lightyears from Earth. My image is a little messed up due to having the wrong backfocus for my camera, which caused the stretching on the outer stars. Going to make a better version on Friday after a part I ordered arrives.
November 14, 2024 at 12:49 AM
Here is NGC 281! The Pacman Nebula, which is 9,459 lightyears from Earth. My image is a little messed up due to having the wrong backfocus for my camera, which caused the stretching on the outer stars. Going to make a better version on Friday after a part I ordered arrives.
Thanks! I printed the focuser myself but got some of the design from www.thingiverse.com/thing:6813399
I'm using an ASI2600, and there's definitely some distortion. Distortion was lowest at around 57mm backfocus, not the advertised 55mm.
I'm using an ASI2600, and there's definitely some distortion. Distortion was lowest at around 57mm backfocus, not the advertised 55mm.
May 30, 2026 at 11:25 PM
Thanks! I printed the focuser myself but got some of the design from www.thingiverse.com/thing:6813399
I'm using an ASI2600, and there's definitely some distortion. Distortion was lowest at around 57mm backfocus, not the advertised 55mm.
I'm using an ASI2600, and there's definitely some distortion. Distortion was lowest at around 57mm backfocus, not the advertised 55mm.
oof, yeah, my backfocus was totally fuck (read: not adjusted at all)
Ah well, we still got to see it in some way.
Ah well, we still got to see it in some way.
October 18, 2024 at 1:26 AM
oof, yeah, my backfocus was totally fuck (read: not adjusted at all)
Ah well, we still got to see it in some way.
Ah well, we still got to see it in some way.
It's a bit bright in Charlotte, but I managed to get a look at the comet. Brighter spot in the sky but no visible tail.
The star pattern around it matches so I'm certain that's what it was, but no tail. Could potentially be that I need to adjust backfocus on my telescope.
The star pattern around it matches so I'm certain that's what it was, but no tail. Could potentially be that I need to adjust backfocus on my telescope.
October 18, 2024 at 12:16 AM
It's a bit bright in Charlotte, but I managed to get a look at the comet. Brighter spot in the sky but no visible tail.
The star pattern around it matches so I'm certain that's what it was, but no tail. Could potentially be that I need to adjust backfocus on my telescope.
The star pattern around it matches so I'm certain that's what it was, but no tail. Could potentially be that I need to adjust backfocus on my telescope.
ked som mal canon mal backfocus a neslo to nastavit v tele aparatu. nikon potom prisiel s tym ze je mozne front/back focus ladit priamo v tele aparatu. to bola zasadna vec. tak som presiel a uz nemam dovod sa vracat naspat. no a samozrejme mam filmovy FE2 a ked vysiel Zf tak volba bola jasna.
March 10, 2025 at 11:19 AM
ked som mal canon mal backfocus a neslo to nastavit v tele aparatu. nikon potom prisiel s tym ze je mozne front/back focus ladit priamo v tele aparatu. to bola zasadna vec. tak som presiel a uz nemam dovod sa vracat naspat. no a samozrejme mam filmovy FE2 a ked vysiel Zf tak volba bola jasna.
Maintenant si je me contente de ne rien toucher à mon Backfocus ou de ne pas ajouter une bague de tilt et que je laisse l’IA gérer à ma place… hmmm 🤔 j’aurais comme une gêne a présenter ma photo comme étant la mienne… ou alors il me faudra le signaler dans les crédits de la photo…
December 15, 2023 at 6:29 PM
Maintenant si je me contente de ne rien toucher à mon Backfocus ou de ne pas ajouter une bague de tilt et que je laisse l’IA gérer à ma place… hmmm 🤔 j’aurais comme une gêne a présenter ma photo comme étant la mienne… ou alors il me faudra le signaler dans les crédits de la photo…
Ça pose qd même pas mal de questions… Une photo qui a des soucis d’étoiles allongées dans les coins et qui est corrigée par BXT reste t’elle une vraie photo ? Si je corrige moi même ma photo en affinant mon Backfocus ou en ajoutant une bague de tilt, ça reste une bonne photo !…
December 15, 2023 at 6:27 PM
Ça pose qd même pas mal de questions… Une photo qui a des soucis d’étoiles allongées dans les coins et qui est corrigée par BXT reste t’elle une vraie photo ? Si je corrige moi même ma photo en affinant mon Backfocus ou en ajoutant une bague de tilt, ça reste une bonne photo !…
Nice but uh, backfocus is too far. (lol sorry, stupid astrophotography hobby)
April 8, 2026 at 3:04 AM
Nice but uh, backfocus is too far. (lol sorry, stupid astrophotography hobby)
The weather has been very uncooperative, and I'm also struggling with backfocus, but I finally managed to collect for about 3 hours on the Tulip Nebula.
#astrophotography
#astrophotography
June 28, 2025 at 3:42 AM
The weather has been very uncooperative, and I'm also struggling with backfocus, but I finally managed to collect for about 3 hours on the Tulip Nebula.
#astrophotography
#astrophotography
Okay thanks. I use an 8" Edge SCT (with a built in flattener) and the celestron OAG. I was able to use standard spacers to get the recommended backfocus. Maybe this is more tricky with your SCT
June 28, 2025 at 7:33 PM
Okay thanks. I use an 8" Edge SCT (with a built in flattener) and the celestron OAG. I was able to use standard spacers to get the recommended backfocus. Maybe this is more tricky with your SCT
Nice image.
Just curious, what is your struggle with backfocus?
Just curious, what is your struggle with backfocus?
June 28, 2025 at 9:33 AM
Nice image.
Just curious, what is your struggle with backfocus?
Just curious, what is your struggle with backfocus?
Newtonians can be great imaging scopes, a bit fussy about backfocus and collimation but then so is my RC :)
May 21, 2023 at 11:50 PM
Newtonians can be great imaging scopes, a bit fussy about backfocus and collimation but then so is my RC :)
I did some experimenting with my IR converted Canon EOS 7D and the colorize neural filter in Photoshop. Mixed results with both. I have discovered a wicked backfocus issue that is my first problem tomorrow.
#photography #infrared #strathmore #alberta #park
#photography #infrared #strathmore #alberta #park
May 31, 2025 at 5:03 AM
I did some experimenting with my IR converted Canon EOS 7D and the colorize neural filter in Photoshop. Mixed results with both. I have discovered a wicked backfocus issue that is my first problem tomorrow.
#photography #infrared #strathmore #alberta #park
#photography #infrared #strathmore #alberta #park
Aw. Only 63.5mm backfocus with reducer is tight tight tight. My other advice still stands: look for generic alternatives that look the same, and chances are it is literally the same part, but without branding. teleskop-express.de is a front store for TS-Optics; they sell good re-branded stuff :)
January 6, 2026 at 8:07 AM
Aw. Only 63.5mm backfocus with reducer is tight tight tight. My other advice still stands: look for generic alternatives that look the same, and chances are it is literally the same part, but without branding. teleskop-express.de is a front store for TS-Optics; they sell good re-branded stuff :)
I have a canon SL1 with a 50mm f1.2, but I desperately need an upgrade. Its just old and my lens tends to backfocus. If I'm upgrading either, I'm upgrading both. I think I'm going to get the Sony a7IV with a Sigma 24-70mm ART and start taking it to cons again.
February 16, 2024 at 5:50 PM
I have a canon SL1 with a 50mm f1.2, but I desperately need an upgrade. Its just old and my lens tends to backfocus. If I'm upgrading either, I'm upgrading both. I think I'm going to get the Sony a7IV with a Sigma 24-70mm ART and start taking it to cons again.
No backfocus issue like the SV555?
December 22, 2025 at 10:05 PM
No backfocus issue like the SV555?
Oui ils sont différents car la correction va dépendre de l'optique de l'instrument. Pour les lunettes, il y a toujours un réducteur spécifique proposé par le fabricant. C'est plus compliqué pour les Newton...
Et là où je trouve ça pénible, c'est d'arriver à respecter le backfocus derrière 😋
Et là où je trouve ça pénible, c'est d'arriver à respecter le backfocus derrière 😋
December 4, 2023 at 5:43 PM
Oui ils sont différents car la correction va dépendre de l'optique de l'instrument. Pour les lunettes, il y a toujours un réducteur spécifique proposé par le fabricant. C'est plus compliqué pour les Newton...
Et là où je trouve ça pénible, c'est d'arriver à respecter le backfocus derrière 😋
Et là où je trouve ça pénible, c'est d'arriver à respecter le backfocus derrière 😋