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[Dew on primary, advice requested]

What are you using to control the fan speed? Is that a feature when combined with an ASA mount?

[Triangular shaped stars]

Thanks Mark. Paracorr 2 backfocus is reported to be 80mm. The mechanical drawing shows 73.3mm from the end of the tube. http://www.televue.com/engine/TV3b_page.asp?id=61&Tab=_phot3

 

[Triangular shaped stars]

Hello all. I have a new to me 10N and 3" Televue Paracorr 2 that I'm having trouble getting anything near round for the stars. Even when centered, stars are triangular or 3 lobed shapes. My image train is the OK3Z focuser, extension plus holder, Paracorr with AVI-3200 imaging system adapter, imaging system-M42 adapter. The camera for the tests is an SBIG STF-8300 with the FW8 filter wheel and OAG. Backfocus of the combination is 57.5mm.

My collimation is close but not spot on yet. Is my problem the spacing, image-train, collimation or something else? I have a Takahashi Epsilon too but have never experienced star shapes like this throughout the field.

The test images attaches were 60" unguided on a Paramount MX. Full resolution and fits are available here: https://www.dropbox.com/sh/ikcd367mt79mb62/AACZkqmjRXcEf_TF803UnIJUa?dl=0

Thanks for any assistance you can lend.

Chris